1
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Pan LL, Atlas EL, Honomichl SB, Smith WP, Kinnison DE, Solomon S, Santee ML, Saiz-Lopez A, Laube JC, Wang B, Ueyama R, Bresch JF, Hornbrook RS, Apel EC, Hills AJ, Treadaway V, Smith K, Schauffler S, Donnelly S, Hendershot R, Lueb R, Campos T, Viciani S, D’Amato F, Bianchini G, Barucci M, Podolske JR, Iraci LT, Gurganus C, Bui P, Dean-Day JM, Millán L, Ryoo JM, Barletta B, Koo JH, Kim J, Liang Q, Randel WJ, Thornberry T, Newman PA. East Asian summer monsoon delivers large abundances of very-short-lived organic chlorine substances to the lower stratosphere. Proc Natl Acad Sci U S A 2024; 121:e2318716121. [PMID: 38483991 PMCID: PMC10962947 DOI: 10.1073/pnas.2318716121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 02/12/2024] [Indexed: 03/27/2024] Open
Abstract
Deep convection in the Asian summer monsoon is a significant transport process for lifting pollutants from the planetary boundary layer to the tropopause level. This process enables efficient injection into the stratosphere of reactive species such as chlorinated very-short-lived substances (Cl-VSLSs) that deplete ozone. Past studies of convective transport associated with the Asian summer monsoon have focused mostly on the south Asian summer monsoon. Airborne observations reported in this work identify the East Asian summer monsoon convection as an effective transport pathway that carried record-breaking levels of ozone-depleting Cl-VSLSs (mean organic chlorine from these VSLSs ~500 ppt) to the base of the stratosphere. These unique observations show total organic chlorine from VSLSs in the lower stratosphere over the Asian monsoon tropopause to be more than twice that previously reported over the tropical tropopause. Considering the recently observed increase in Cl-VSLS emissions and the ongoing strengthening of the East Asian summer monsoon under global warming, our results highlight that a reevaluation of the contribution of Cl-VSLS injection via the Asian monsoon to the total stratospheric chlorine budget is warranted.
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Affiliation(s)
- Laura L. Pan
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Elliot L. Atlas
- Rosenstiel School of Marine, Earth, and Atmospheric Science, Department of Atmospheric Sciences, University of Miami, Miami, FL33149
| | - Shawn B. Honomichl
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Warren P. Smith
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Douglas E. Kinnison
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Susan Solomon
- Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA02139
| | - Michelle L. Santee
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA91109
| | - Alfonso Saiz-Lopez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera, The Spanish National Research Council (CSIC), Madrid28006, Spain
| | - Johannes C. Laube
- Institute for Energy and Climate Research (IEK-7), Forschungszentrum Jülich, Jülich52425, Germany
| | - Bin Wang
- Department of Atmospheric Sciences and International Pacific Research Center, The University of Hawaii, Honolulu, HI96822
| | - Rei Ueyama
- NASA Ames Research Center, Moffett Field, CA94035
| | - James F. Bresch
- Mesoscale and Microscale Meteorology Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Eric C. Apel
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Alan J. Hills
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Victoria Treadaway
- Rosenstiel School of Marine, Earth, and Atmospheric Science, Department of Atmospheric Sciences, University of Miami, Miami, FL33149
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO80309
- National Oceanic and Atmospheric Administration Chemical Sciences Laboratory, Boulder, CO80305
| | - Katie Smith
- Rosenstiel School of Marine, Earth, and Atmospheric Science, Department of Atmospheric Sciences, University of Miami, Miami, FL33149
| | - Sue Schauffler
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
- Rosenstiel School of Marine, Earth, and Atmospheric Science, Department of Atmospheric Sciences, University of Miami, Miami, FL33149
| | - Stephen Donnelly
- Rosenstiel School of Marine, Earth, and Atmospheric Science, Department of Atmospheric Sciences, University of Miami, Miami, FL33149
- Department of Chemistry, Fort Hays State University, Hays, KS67601
| | - Roger Hendershot
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
- Rosenstiel School of Marine, Earth, and Atmospheric Science, Department of Atmospheric Sciences, University of Miami, Miami, FL33149
| | - Richard Lueb
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
- Rosenstiel School of Marine, Earth, and Atmospheric Science, Department of Atmospheric Sciences, University of Miami, Miami, FL33149
| | - Teresa Campos
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Silvia Viciani
- National Institute of Optics, National Research Council, Sesto Fiorentino50019, Italy
| | - Francesco D’Amato
- National Institute of Optics, National Research Council, Sesto Fiorentino50019, Italy
| | - Giovanni Bianchini
- National Institute of Optics, National Research Council, Sesto Fiorentino50019, Italy
| | - Marco Barucci
- National Institute of Optics, National Research Council, Sesto Fiorentino50019, Italy
| | | | | | - Colin Gurganus
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO80309
- National Oceanic and Atmospheric Administration Chemical Sciences Laboratory, Boulder, CO80305
| | - Paul Bui
- NASA Ames Research Center, Moffett Field, CA94035
- Bay Area Environmental Research Institute, Moffett Field, CA94035
| | - Jonathan M. Dean-Day
- NASA Ames Research Center, Moffett Field, CA94035
- Bay Area Environmental Research Institute, Moffett Field, CA94035
| | - Luis Millán
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA91109
| | - Ju-Mee Ryoo
- NASA Ames Research Center, Moffett Field, CA94035
- Science and Technology Corporation, Moffett Field, CA94035
| | - Barbara Barletta
- Department of Chemistry, University of California Irvine, Irvine, CA92697
| | - Ja-Ho Koo
- Department of Atmospheric Sciences, Yonsei University, Seoul03722, Republic of Korea
| | - Joowan Kim
- Department of Atmospheric Science, Kongju National University, Gongju32588, Republic of Korea
| | - Qing Liang
- NASA Goddard Space Flight Center, Greenbelt, MD20771
| | - William J. Randel
- Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO80301
| | - Troy Thornberry
- National Oceanic and Atmospheric Administration Chemical Sciences Laboratory, Boulder, CO80305
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2
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Ye C, Zhou X, Zhang Y, Wang Y, Wang J, Zhang C, Woodward-Massey R, Cantrell C, Mauldin RL, Campos T, Hornbrook RS, Ortega J, Apel EC, Haggerty J, Hall S, Ullmann K, Weinheimer A, Stutz J, Karl T, Smith JN, Guenther A, Song S. Synthesizing evidence for the external cycling of NO x in high- to low-NO x atmospheres. Nat Commun 2023; 14:7995. [PMID: 38042847 PMCID: PMC10693570 DOI: 10.1038/s41467-023-43866-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 11/22/2023] [Indexed: 12/04/2023] Open
Abstract
External cycling regenerating nitrogen oxides (NOx ≡ NO + NO2) from their oxidative reservoir, NOz, is proposed to reshape the temporal-spatial distribution of NOx and consequently hydroxyl radical (OH), the most important oxidant in the atmosphere. Here we verify the in situ external cycling of NOx in various environments with nitrous acid (HONO) as an intermediate based on synthesized field evidence collected onboard aircraft platform at daytime. External cycling helps to reconcile stubborn underestimation on observed ratios of HONO/NO2 and NO2/NOz by current chemical model schemes and rationalize atypical diurnal concentration profiles of HONO and NO2 lacking noontime valleys specially observed in low-NOx atmospheres. Perturbation on the budget of HONO and NOx by external cycling is also found to increase as NOx concentration decreases. Consequently, model underestimation of OH observations by up to 41% in low NOx atmospheres is attributed to the omission of external cycling in models.
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Affiliation(s)
- Chunxiang Ye
- State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKL-ESPC), College of Environmental Sciences and Engineering, Peking University, Beijing, China.
| | - Xianliang Zhou
- Wadsworth Center, New York State Department of Health, Albany, NY, USA
- Department of Environmental Health Sciences, State University of New York, Albany, NY, USA
| | - Yingjie Zhang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKL-ESPC), College of Environmental Sciences and Engineering, Peking University, Beijing, China
- School of Ecology and Nature Conservation, Beijing Forestry University, Beijing, China
| | - Youfeng Wang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKL-ESPC), College of Environmental Sciences and Engineering, Peking University, Beijing, China
| | - Jianshu Wang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKL-ESPC), College of Environmental Sciences and Engineering, Peking University, Beijing, China
| | - Chong Zhang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKL-ESPC), College of Environmental Sciences and Engineering, Peking University, Beijing, China
| | - Robert Woodward-Massey
- State Key Joint Laboratory of Environmental Simulation and Pollution Control (SKL-ESPC), College of Environmental Sciences and Engineering, Peking University, Beijing, China
- Department of Chemistry, University of Leeds, Leeds, UK
| | - Christopher Cantrell
- Université Paris-est Créteil, LISA (Laboratoire Interuniversitaire des Systèmes Atmosphériques), Paris, France
| | - Roy L Mauldin
- Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, USA
- Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, USA
| | - Teresa Campos
- National Center for Atmospheric Research, Boulder, CO, USA
| | | | - John Ortega
- National Center for Atmospheric Research, Boulder, CO, USA
| | - Eric C Apel
- National Center for Atmospheric Research, Boulder, CO, USA
| | - Julie Haggerty
- National Center for Atmospheric Research, Boulder, CO, USA
| | - Samuel Hall
- National Center for Atmospheric Research, Boulder, CO, USA
| | - Kirk Ullmann
- National Center for Atmospheric Research, Boulder, CO, USA
| | | | - Jochen Stutz
- Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, USA
| | - Thomas Karl
- Institute for Meteorology and Geophysics, University of Innsbruck, Innsbruck, Austria
| | - James N Smith
- Earth System Science, University of California, Irvine, CA, USA
| | - Alex Guenther
- Earth System Science, University of California, Irvine, CA, USA
| | - Shaojie Song
- State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control & Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin, China
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3
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Katich JM, Apel EC, Bourgeois I, Brock CA, Bui TP, Campuzano-Jost P, Commane R, Daube B, Dollner M, Fromm M, Froyd KD, Hills AJ, Hornbrook RS, Jimenez JL, Kupc A, Lamb KD, McKain K, Moore F, Murphy DM, Nault BA, Peischl J, Perring AE, Peterson DA, Ray EA, Rosenlof KH, Ryerson T, Schill GP, Schroder JC, Weinzierl B, Thompson C, Williamson CJ, Wofsy SC, Yu P, Schwarz JP. Pyrocumulonimbus affect average stratospheric aerosol composition. Science 2023; 379:815-820. [PMID: 36821693 DOI: 10.1126/science.add3101] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Pyrocumulonimbus (pyroCb) are wildfire-generated convective clouds that can inject smoke directly into the stratosphere. PyroCb have been tracked for years, yet their apparent rarity and episodic nature lead to highly uncertain climate impacts. In situ measurements of pyroCb smoke reveal its distinctive and exceptionally stable aerosol properties and define the long-term influence of pyroCb activity on the stratospheric aerosol budget. Analysis of 13 years of airborne observations shows that pyroCb are responsible for 10 to 25% of the black carbon and organic aerosols in the "present-day" lower stratosphere, with similar impacts in both the North and South Hemispheres. These results suggest that, should pyroCb increase in frequency and/or magnitude in future climates, they could generate dominant trends in stratospheric aerosol.
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Affiliation(s)
- J M Katich
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - E C Apel
- Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - I Bourgeois
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - C A Brock
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA
| | - T P Bui
- NASA Ames Research Center, Moffett Field, CA, USA
| | - P Campuzano-Jost
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.,Department of Chemistry, University of Colorado, Boulder, CO, USA
| | - R Commane
- Department of Earth and Environmental Sciences and School of Engineering and Applied Sciences, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
| | - B Daube
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA
| | - M Dollner
- Aerosol Physics and Environmental Physics, Faculty of Physics, University of Vienna, Vienna, Austria
| | - M Fromm
- Naval Research Laboratory, Washington, DC, USA
| | - K D Froyd
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - A J Hills
- Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - R S Hornbrook
- Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - J L Jimenez
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.,Department of Chemistry, University of Colorado, Boulder, CO, USA
| | - A Kupc
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.,Aerosol Physics and Environmental Physics, Faculty of Physics, University of Vienna, Vienna, Austria
| | - K D Lamb
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - K McKain
- NOAA Global Monitoring Laboratory, Boulder, CO, USA
| | - F Moore
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.,NOAA Global Monitoring Laboratory, Boulder, CO, USA
| | - D M Murphy
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA
| | - B A Nault
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.,Department of Chemistry, University of Colorado, Boulder, CO, USA.,Center for Aerosol and Cloud Chemistry, Aerodyne Research Inc., Billerica, MA, USA
| | - J Peischl
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - A E Perring
- Department of Chemistry, Colgate University, Hamilton, NY, USA
| | | | - E A Ray
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - K H Rosenlof
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA
| | - T Ryerson
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA
| | - G P Schill
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - J C Schroder
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.,Department of Chemistry, University of Colorado, Boulder, CO, USA.,Colorado Department of Public Health and Environment, Denver, CO, USA
| | - B Weinzierl
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA
| | - C Thompson
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - C J Williamson
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - S C Wofsy
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA
| | - P Yu
- Institute of Environmental and Climate Research, Jinan University, Guangzhou, People's Republic of China
| | - J P Schwarz
- National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory (CSL), Boulder, CO, USA
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4
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Schwantes RH, Lacey FG, Tilmes S, Emmons LK, Lauritzen PH, Walters S, Callaghan P, Zarzycki CM, Barth MC, Jo DS, Bacmeister JT, Neale RB, Vitt F, Kluzek E, Roozitalab B, Hall SR, Ullmann K, Warneke C, Peischl J, Pollack IB, Flocke F, Wolfe GM, Hanisco TF, Keutsch FN, Kaiser J, Bui TPV, Jimenez JL, Campuzano‐Jost P, Apel EC, Hornbrook RS, Hills AJ, Yuan B, Wisthaler A. Evaluating the Impact of Chemical Complexity and Horizontal Resolution on Tropospheric Ozone Over the Conterminous US With a Global Variable Resolution Chemistry Model. J Adv Model Earth Syst 2022; 14:e2021MS002889. [PMID: 35864945 PMCID: PMC9286600 DOI: 10.1029/2021ms002889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 02/24/2022] [Accepted: 04/24/2022] [Indexed: 05/19/2023]
Abstract
A new configuration of the Community Earth System Model (CESM)/Community Atmosphere Model with full chemistry (CAM-chem) supporting the capability of horizontal mesh refinement through the use of the spectral element (SE) dynamical core is developed and called CESM/CAM-chem-SE. Horizontal mesh refinement in CESM/CAM-chem-SE is unique and novel in that pollutants such as ozone are accurately represented at human exposure relevant scales while also directly including global feedbacks. CESM/CAM-chem-SE with mesh refinement down to ∼14 km over the conterminous US (CONUS) is the beginning of the Multi-Scale Infrastructure for Chemistry and Aerosols (MUSICAv0). Here, MUSICAv0 is evaluated and used to better understand how horizontal resolution and chemical complexity impact ozone and ozone precursors over CONUS as compared to measurements from five aircraft campaigns, which occurred in 2013. This field campaign analysis demonstrates the importance of using finer horizontal resolution to accurately simulate ozone precursors such as nitrogen oxides and carbon monoxide. In general, the impact of using more complex chemistry on ozone and other oxidation products is more pronounced when using finer horizontal resolution where a larger number of chemical regimes are resolved. Large model biases for ozone near the surface remain in the Southeast US as compared to the aircraft observations even with updated chemistry and finer horizontal resolution. This suggests a need for adding the capability of replacing sections of global emission inventories with regional inventories, increasing the vertical resolution in the planetary boundary layer, and reducing model biases in meteorological variables such as temperature and clouds.
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5
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O'Dell K, Hornbrook RS, Permar W, Levin EJT, Garofalo LA, Apel EC, Blake NJ, Jarnot A, Pothier MA, Farmer DK, Hu L, Campos T, Ford B, Pierce JR, Fischer EV. Correction to Hazardous Air Pollutants in Fresh and Aged Western US Wildfire Smoke and Implications for Long-Term Exposure. Environ Sci Technol 2022; 56:3304. [PMID: 35175737 DOI: 10.1021/acs.est.2c01008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
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6
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Koenig TK, Volkamer R, Apel EC, Bresch JF, Cuevas CA, Dix B, Eloranta EW, Fernandez RP, Hall SR, Hornbrook RS, Pierce RB, Reeves JM, Saiz-Lopez A, Ullmann K. Ozone depletion due to dust release of iodine in the free troposphere. Sci Adv 2021; 7:eabj6544. [PMID: 34936464 PMCID: PMC8694599 DOI: 10.1126/sciadv.abj6544] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 11/03/2021] [Indexed: 06/03/2023]
Abstract
Iodine is an atmospheric trace element emitted from oceans that efficiently destroys ozone (O3). Low O3 in airborne dust layers is frequently observed but poorly understood. We show that dust is a source of gas-phase iodine, indicated by aircraft observations of iodine monoxide (IO) radicals inside lofted dust layers from the Atacama and Sechura Deserts that are up to a factor of 10 enhanced over background. Gas-phase iodine photochemistry, commensurate with observed IO, is needed to explain the low O3 inside these dust layers (below 15 ppbv; up to 75% depleted). The added dust iodine can explain decreases in O3 of 8% regionally and affects surface air quality. Our data suggest that iodate reduction to form volatile iodine species is a missing process in the geochemical iodine cycle and presents an unrecognized aeolian source of iodine. Atmospheric iodine has tripled since 1950 and affects ozone layer recovery and particle formation.
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Affiliation(s)
- Theodore K. Koenig
- Department of Chemistry, University of Colorado Boulder, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, CO, USA
| | - Rainer Volkamer
- Department of Chemistry, University of Colorado Boulder, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, CO, USA
| | - Eric C. Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - James F. Bresch
- Mesoscale & Microscale Meteorology Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Carlos A. Cuevas
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, Spanish National Research Council (CSIC), Madrid, Spain
| | - Barbara Dix
- Department of Chemistry, University of Colorado Boulder, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, CO, USA
| | - Edwin W. Eloranta
- Space Science and Engineering Center, University of Wisconsin, Madison, WI, USA
| | - Rafael P. Fernandez
- Institute for Interdisciplinary Science, National Research Council (ICB-CONICET), FCEN-UNCuyo, Mendoza, Argentina
| | - Samuel R. Hall
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - R. Bradley Pierce
- The National Environmental Satellite, Data, and Information Service (NESDIS), Madison, WI, USA
| | - J. Michael Reeves
- Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Alfonso Saiz-Lopez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, Spanish National Research Council (CSIC), Madrid, Spain
| | - Kirk Ullmann
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
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7
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Navarro KM, West MR, O’Dell K, Sen P, Chen IC, Fischer EV, Hornbrook RS, Apel EC, Hills AJ, Jarnot A, DeMott P, Domitrovich JW. Exposure to Particulate Matter and Estimation of Volatile Organic Compounds across Wildland Firefighter Job Tasks. Environ Sci Technol 2021; 55:11795-11804. [PMID: 34488352 PMCID: PMC8978153 DOI: 10.1021/acs.est.1c00847] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Wildland firefighters are exposed to smoke-containing particulate matter (PM) and volatile organic compounds (VOCs) while suppressing wildfires. From 2015 to 2017, the U.S. Forest Service conducted a field study collecting breathing zone measurements of PM4 (particulate matter with aerodynamic diameter ≤4 μm) on wildland firefighters from different crew types and while performing various fire suppression tasks on wildfires. Emission ratios of VOC (parts per billion; ppb): PM1 (particulate matter with aerodynamic diameter ≤1 μm; mg/m3) were calculated using data from a separate field study conducted in summer 2018, the Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE-CAN) Campaign. These emission ratios were used to estimate wildland firefighter exposure to acrolein, benzene, and formaldehyde. Results of this field sampling campaign reported that exposure to PM4 and VOC varied across wildland firefighter crew type and job task. Type 1 crews had greater exposures to both PM4 and VOCs than type 2 or type 2 initial attack crews, and wildland firefighters performing direct suppression had statistically higher exposures than those performing staging and other tasks (mean differences = 0.82 and 0.75 mg/m3; 95% confidence intervals = 0.38-1.26 and 0.41-1.08 mg/m3, respectively). Of the 81 personal exposure samples collected, 19% of measured PM4 exposures exceeded the recommended National Wildland Fire Coordinating Group occupational exposure limit (0.7 mg/m3). Wildland fire management should continue to find strategies to reduce smoke exposures for wildland firefighters.
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Affiliation(s)
- Kathleen M. Navarro
- USDA Forest Service, Pacific Southwest Region, Fire and Aviation Management, Clovis, 93611, USA
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Division of Field Studies and Engineering, Cincinnati, 45213, USA
| | - Molly R. West
- USDA Forest Service, National Technology and Development Program, Missoula, 59804, USA
| | - Katelyn O’Dell
- Department of Atmospheric Science, Colorado State University, Fort Collins, 80521, USA
| | - Paro Sen
- Amentum Services, Germantown, 20876, USA
| | - I-Chen Chen
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Division of Field Studies and Engineering, Cincinnati, 45213, USA
| | - Emily V. Fischer
- Department of Atmospheric Science, Colorado State University, Fort Collins, 80521, USA
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, 80305, USA
| | - Eric C. Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, 80305, USA
| | - Alan J. Hills
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, 80305, USA
| | - Alex Jarnot
- University of California Irvine, Department of Chemistry, Irvine, 92617, USA
| | - Paul DeMott
- Department of Atmospheric Science, Colorado State University, Fort Collins, 80521, USA
| | - Joseph W. Domitrovich
- USDA Forest Service, National Technology and Development Program, Missoula, 59804, USA
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8
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Chen X, Millet DB, Neuman JA, Veres PR, Ray EA, Commane R, Daube BC, McKain K, Schwarz JP, Katich JM, Froyd KD, Schill GP, Kim MJ, Crounse JD, Allen HM, Apel EC, Hornbrook RS, Blake DR, Nault BA, Campuzano-Jost P, Jimenez JL, Dibb JE. HCOOH in the remote atmosphere: Constraints from Atmospheric Tomography (ATom) airborne observations. ACS Earth Space Chem 2021; 5:1436-1454. [PMID: 34164590 PMCID: PMC8216292 DOI: 10.1021/acsearthspacechem.1c00049] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Formic acid (HCOOH) is an important component of atmospheric acidity but its budget is poorly understood, with prior observations implying substantial missing sources. Here we combine pole-to-pole airborne observations from the Atmospheric Tomography Mission (ATom) with chemical transport model (GEOS-Chem CTM) and back trajectory analyses to provide the first global in-situ characterization of HCOOH in the remote atmosphere. ATom reveals sub-100 ppt HCOOH concentrations over most of the remote oceans, punctuated by large enhancements associated with continental outflow. Enhancements correlate with known combustion tracers and trajectory-based fire influences. The GEOS-Chem model underpredicts these in-plume HCOOH enhancements, but elsewhere we find no broad indication of a missing HCOOH source in the background free troposphere. We conclude that missing non-fire HCOOH precursors inferred previously are predominantly short-lived. We find indications of a wet scavenging underestimate in the model consistent with a positive HCOOH bias in the tropical upper troposphere. Observations reveal episodic evidence of ocean HCOOH uptake, which is well-captured by GEOS-Chem; however, despite its strong seawater undersaturation HCOOH is not consistently depleted in the remote marine boundary layer. Over fifty fire and mixed plumes were intercepted during ATom with widely varying transit times and source regions. HCOOH:CO normalized excess mixing ratios in these plumes range from 3.4 to >50 ppt/ppb CO and are often over an order of magnitude higher than expected primary emission ratios. HCOOH is thus a major reactive organic carbon reservoir in the aged plumes sampled during ATom, implying important missing pathways for in-plume HCOOH production.
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Affiliation(s)
- Xin Chen
- Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN 55108
| | - Dylan B. Millet
- Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN 55108
| | - J. Andrew Neuman
- NOAA Chemical Sciences Laboratory, Boulder, CO 80305
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
| | | | - Eric A. Ray
- NOAA Chemical Sciences Laboratory, Boulder, CO 80305
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
| | - Róisín Commane
- Department of Earth and Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, New York, NY 10964
| | - Bruce C. Daube
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
| | - Kathryn McKain
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
- NOAA Global Monitoring Laboratory, Boulder, CO 80305
| | | | - Joseph M. Katich
- NOAA Chemical Sciences Laboratory, Boulder, CO 80305
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
| | - Karl D. Froyd
- NOAA Chemical Sciences Laboratory, Boulder, CO 80305
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
| | - Gregory P. Schill
- NOAA Chemical Sciences Laboratory, Boulder, CO 80305
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
| | - Michelle J. Kim
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
| | - John D. Crounse
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
| | - Hannah M. Allen
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
| | - Eric C. Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307
| | - Donald R. Blake
- Department of Chemistry, University of California, Irvine, CA 92697
| | - Benjamin A. Nault
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
- Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309
| | - Pedro Campuzano-Jost
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
- Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309
| | - Jose L. Jimenez
- Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309
- Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309
| | - Jack E. Dibb
- Earth Systems Research Center/EOS, University of New Hampshire, Durham, NH 03824
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9
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Asher E, Hills AJ, Hornbrook RS, Shertz S, Gabbard S, Stephens BB, Helmig D, Apel EC. Unpiloted Aircraft System Instrument for the Rapid Collection of Whole Air Samples and Measurements for Environmental Monitoring and Air Quality Studies. Environ Sci Technol 2021; 55:5657-5667. [PMID: 33881834 DOI: 10.1021/acs.est.0c07213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A new airborne system, the Whole Air Sampling Pilotless Platform (WASPP), is described for the collection of whole air samples and in situ meteorological measurements onboard a commercial hexacopter. Rapid sample collection enables the collection ≤15 air samples per flight in positively pressurized miniature canisters, subsequently analyzed on a mated analytical system for up to 80 nonmethane volatile organic compounds (VOCs). The WASPP is well suited to investigate VOC gradients in urban environments impacted by traffic, industry, and oil and natural gas (O&NG) development, but has the sensitivity to characterize continental background conditions, as shown here using a subset of >40 species. We document empirical tests to minimize the influence of rotor wash and other sampling artifacts and report favorable results of laboratory-based calibrations of the WASPP's meteorological sensors and field-based comparisons of WASPP's VOC measurements and horizontal wind velocity measurements. Airborne WASPP measurements can complement and enhance ground-based VOC monitoring efforts by providing substantial meteorological and VOC measurement capability across vertical and horizontal spatial scales. These measurements reveal strong vertical gradients in VOC mixing ratios, depending on local meteorology and sources. WASPP has wide applicability for pollution source identification and quantification of hazardous air pollutants and precursors of criteria pollutants, including monitoring O&NG emissions or industry fenceline monitoring.
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Affiliation(s)
- Elizabeth Asher
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
- Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
- National Oceanic and Atmospheric Administration, Boulder, Colorado 80305, United States
| | - Alan J Hills
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Rebecca S Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Stephen Shertz
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Stephen Gabbard
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Britton B Stephens
- Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Detlev Helmig
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado 80309, United States
| | - Eric C Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
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10
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O'Dell K, Hornbrook RS, Permar W, Levin EJT, Garofalo LA, Apel EC, Blake NJ, Jarnot A, Pothier MA, Farmer DK, Hu L, Campos T, Ford B, Pierce JR, Fischer EV. Hazardous Air Pollutants in Fresh and Aged Western US Wildfire Smoke and Implications for Long-Term Exposure. Environ Sci Technol 2020; 54:11838-11847. [PMID: 32857515 DOI: 10.1021/acs.est.0c04497] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Wildfires have a significant adverse impact on air quality in the United States (US). To understand the potential health impacts of wildfire smoke, many epidemiology studies rely on concentrations of fine particulate matter (PM) as a smoke tracer. However, there are many gas-phase hazardous air pollutants (HAPs) identified by the Environmental Protection Agency (EPA) that are also present in wildfire smoke plumes. Using observations from the Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE-CAN), a 2018 aircraft-based field campaign that measured HAPs and PM in western US wildfire smoke plumes, we identify the relationships between HAPs and associated health risks, PM, and smoke age. We find the ratios between acute, chronic noncancer, and chronic cancer HAPs health risk and PM in smoke decrease as a function of smoke age by up to 72% from fresh (<1 day of aging) to old (>3 days of aging) smoke. We show that acrolein, formaldehyde, benzene, and hydrogen cyanide are the dominant contributors to gas-phase HAPs risk in smoke plumes. Finally, we use ratios of HAPs to PM along with annual average smoke-specific PM to estimate current and potential future smoke HAPs risks.
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Affiliation(s)
- Katelyn O'Dell
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80521, United States
| | - Rebecca S Hornbrook
- Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Wade Permar
- Department of Chemistry and Biochemistry, University of Montana, Missoula, Montana 59812, United States
| | - Ezra J T Levin
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80521, United States
| | - Lauren A Garofalo
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Eric C Apel
- Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Nicola J Blake
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Alex Jarnot
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Matson A Pothier
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Delphine K Farmer
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Lu Hu
- Department of Chemistry and Biochemistry, University of Montana, Missoula, Montana 59812, United States
| | - Teresa Campos
- Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Bonne Ford
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80521, United States
| | - Jeffrey R Pierce
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80521, United States
| | - Emily V Fischer
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80521, United States
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11
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Travis KR, Heald CL, Allen HM, Apel EC, Arnold SR, Blake DR, Brune WH, Chen X, Commane R, Crounse JD, Daube BC, Diskin GS, Elkins JW, Evans MJ, Hall SR, Hintsa EJ, Hornbrook RS, Kasibhatla PS, Kim MJ, Luo G, McKain K, Millet DB, Moore FL, Peischl J, Ryerson TB, Sherwen T, Thames AB, Ullmann K, Wang X, Wennberg PO, Wolfe GM, Yu F. Constraining remote oxidation capacity with ATom observations. Atmos Chem Phys 2020; 20:7753-7781. [PMID: 33688335 PMCID: PMC7939060 DOI: 10.5194/acp-20-7753-2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The global oxidation capacity, defined as the tropospheric mean concentration of the hydroxyl radical (OH), controls the lifetime of reactive trace gases in the atmosphere such as methane and carbon monoxide (CO). Models tend to underestimate the methane lifetime and CO concentrations throughout the troposphere, which is consistent with excessive OH. Approximately half of the oxidation of methane and non-methane volatile organic compounds (VOCs) is thought to occur over the oceans where oxidant chemistry has received little validation due to a lack of observational constraints. We use observations from the first two deployments of the NASA ATom aircraft campaign during July-August 2016 and January-February 2017 to evaluate the oxidation capacity over the remote oceans and its representation by the GEOS-Chem chemical transport model. The model successfully simulates the magnitude and vertical profile of remote OH within the measurement uncertainties. Comparisons against the drivers of OH production (water vapor, ozone, and NO y concentrations, ozone photolysis frequencies) also show minimal bias, with the exception of wintertime NO y . The severe model overestimate of NO y during this period may indicate insufficient wet scavenging and/or missing loss on sea-salt aerosols. Large uncertainties in these processes require further study to improve simulated NO y partitioning and removal in the troposphere, but preliminary tests suggest that their overall impact could marginally reduce the model bias in tropospheric OH. During the ATom-1 deployment, OH reactivity (OHR) below 3 km is significantly enhanced, and this is not captured by the sum of its measured components (cOHRobs) or by the model (cOHRmod). This enhancement could suggest missing reactive VOCs but cannot be explained by a comprehensive simulation of both biotic and abiotic ocean sources of VOCs. Additional sources of VOC reactivity in this region are difficult to reconcile with the full suite of ATom measurement constraints. The model generally reproduces the magnitude and seasonality of cOHRobs but underestimates the contribution of oxygenated VOCs, mainly acetaldehyde, which is severely underestimated throughout the troposphere despite its calculated lifetime of less than a day. Missing model acetaldehyde in previous studies was attributed to measurement uncertainties that have been largely resolved. Observations of peroxyacetic acid (PAA) provide new support for remote levels of acetaldehyde. The underestimate in both model acetaldehyde and PAA is present throughout the year in both hemispheres and peaks during Northern Hemisphere summer. The addition of ocean sources of VOCs in the model increases cOHRmod by 3% to 9% and improves model-measurement agreement for acetaldehyde, particularly in winter, but cannot resolve the model summertime bias. Doing so would require 100 Tg yr-1 of a long-lived unknown precursor throughout the year with significant additional emissions in the Northern Hemisphere summer. Improving the model bias for remote acetaldehyde and PAA is unlikely to fully resolve previously reported model global biases in OH and methane lifetime, suggesting that future work should examine the sources and sinks of OH over land.
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Affiliation(s)
- Katherine R. Travis
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Colette L. Heald
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Hannah M. Allen
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Eric C. Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Stephen R. Arnold
- Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK
| | - Donald R. Blake
- Department of Chemistry, University of California Irvine, Irvine, CA, USA
| | - William H. Brune
- Department of Meteorology, Pennsylvania State University, University Park, PA, USA
| | - Xin Chen
- University of Minnesota, Department of Soil, Water and Climate, St. Paul, MN, USA
| | - Róisín Commane
- Dept. of Earth & Environmental Sciences of Lamont-Doherty Earth Observatory and Columbia University, Palisades, NY, USA
| | - John D. Crounse
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - Bruce C. Daube
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | | | - James W. Elkins
- Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - Mathew J. Evans
- Wolfson Atmospheric Chemistry Laboratories (WACL), Department of Chemistry, University of York, York, UK
- National Centre for Atmospheric Science (NCAS), University of York, York, UK
| | - Samuel R. Hall
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Eric J. Hintsa
- Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Science, University of Colorado, CO, USA
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | | | - Michelle J. Kim
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Gan Luo
- Atmospheric Sciences Research Center, University of Albany, Albany, NY, USA
| | - Kathryn McKain
- Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Science, University of Colorado, CO, USA
| | - Dylan B. Millet
- University of Minnesota, Department of Soil, Water and Climate, St. Paul, MN, USA
| | - Fred L. Moore
- Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Science, University of Colorado, CO, USA
| | - Jeffrey Peischl
- Cooperative Institute for Research in Environmental Science, University of Colorado, CO, USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - Thomas B. Ryerson
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - Tomás Sherwen
- Wolfson Atmospheric Chemistry Laboratories (WACL), Department of Chemistry, University of York, York, UK
- National Centre for Atmospheric Science (NCAS), University of York, York, UK
| | - Alexander B. Thames
- Department of Meteorology, Pennsylvania State University, University Park, PA, USA
| | - Kirk Ullmann
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Xuan Wang
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
- School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Paul O. Wennberg
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA, USA
| | - Glenn M. Wolfe
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - Fangqun Yu
- Atmospheric Sciences Research Center, University of Albany, Albany, NY, USA
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12
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McNamara S, Kolesar KR, Wang S, Kirpes RM, May NW, Gunsch MJ, Cook RD, Fuentes JD, Hornbrook RS, Apel EC, China S, Laskin A, Pratt KA. Observation of Road Salt Aerosol Driving Inland Wintertime Atmospheric Chlorine Chemistry. ACS Cent Sci 2020; 6:684-694. [PMID: 32490185 PMCID: PMC7256959 DOI: 10.1021/acscentsci.9b00994] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Indexed: 05/31/2023]
Abstract
Inland sources of particulate chloride for atmospheric nitryl chloride (ClNO2) formation remain unknown and unquantified, hindering air quality assessments. Globally each winter, tens of millions of tons of road salt are spread on roadways for deicing. Here, we identify road salt aerosol as the primary chloride aerosol source, accounting for 80-100% of ClNO2 formation, at an inland urban area in the wintertime. This study provides experimental evidence of the connection between road salt and air quality through the production of this important reservoir for nitrogen oxides and chlorine radicals, which significantly impact atmospheric composition and pollutant fates. A numerical model was employed to quantify the contributions of chloride sources to ClNO2 production. The traditional method for simulating ClNO2 considers chloride to be homogeneously distributed across the atmospheric particle population; yet, we show that only a fraction of the particulate surface area contains chloride. Our new single-particle parametrization considers this heterogeneity, dramatically lowering overestimations of ClNO2 levels that have been routinely reported using the prevailing methods. The identification of road salt as a ClNO2 source links this common deicing practice to atmospheric composition and air quality in the urban wintertime environment.
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Affiliation(s)
- Stephen
M. McNamara
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
| | - Katheryn R. Kolesar
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
| | - Siyuan Wang
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
| | - Rachel M. Kirpes
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
| | - Nathaniel W. May
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
| | - Matthew J. Gunsch
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
| | - Ryan D. Cook
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
| | - Jose D. Fuentes
- Department
of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, Pennsylvania, United States
| | - Rebecca S. Hornbrook
- Atmospheric
Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado, United States
| | - Eric C. Apel
- Atmospheric
Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado, United States
| | - Swarup China
- Environmental
Molecular Sciences Laboratory, Pacific Northwest
National Laboratory, Richland, Washington, United States
| | - Alexander Laskin
- Environmental
Molecular Sciences Laboratory, Pacific Northwest
National Laboratory, Richland, Washington, United States
| | - Kerri A. Pratt
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan, United States
- Department
of Earth and Environmental Sciences, University
of Michigan, Ann Arbor, Michigan, United States
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13
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Peng Q, Palm BB, Melander KE, Lee BH, Hall SR, Ullmann K, Campos T, Weinheimer AJ, Apel EC, Hornbrook RS, Hills AJ, Montzka DD, Flocke F, Hu L, Permar W, Wielgasz C, Lindaas J, Pollack IB, Fischer EV, Bertram TH, Thornton JA. HONO Emissions from Western U.S. Wildfires Provide Dominant Radical Source in Fresh Wildfire Smoke. Environ Sci Technol 2020; 54:5954-5963. [PMID: 32294377 DOI: 10.1021/acs.est.0c00126] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Wildfires are an important source of nitrous acid (HONO), a photolabile radical precursor, yet in situ measurements and quantification of primary HONO emissions from open wildfires have been scarce. We present airborne observations of HONO within wildfire plumes sampled during the Western Wildfire Experiment for Cloud chemistry, Aerosol absorption and Nitrogen (WE-CAN) campaign. ΔHONO/ΔCO close to the fire locations ranged from 0.7 to 17 pptv ppbv-1 using a maximum enhancement method, with the median similar to previous observations of temperate forest fire plumes. Measured HONO to NOx enhancement ratios were generally factors of 2, or higher, at early plume ages than previous studies. Enhancement ratios scale with modified combustion efficiency and certain nitrogenous trace gases, which may be useful to estimate HONO release when HONO observations are lacking or plumes have photochemical exposures exceeding an hour as emitted HONO is rapidly photolyzed. We find that HONO photolysis is the dominant contributor to hydrogen oxide radicals (HOx = OH + HO2) in early stage (<3 h) wildfire plume evolution. These results highlight the role of HONO as a major component of reactive nitrogen emissions from wildfires and the main driver of initial photochemical oxidation.
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Affiliation(s)
- Qiaoyun Peng
- Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States
| | - Brett B Palm
- Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States
| | - Kira E Melander
- Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States
| | - Ben H Lee
- Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States
| | - Samuel R Hall
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Kirk Ullmann
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Teresa Campos
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Andrew J Weinheimer
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Eric C Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Rebecca S Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Alan J Hills
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Denise D Montzka
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Frank Flocke
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
| | - Lu Hu
- Department of Chemistry and Biochemistry, University of Montana, Missoula, Montana 59812, United States
| | - Wade Permar
- Department of Chemistry and Biochemistry, University of Montana, Missoula, Montana 59812, United States
| | - Catherine Wielgasz
- Department of Chemistry and Biochemistry, University of Montana, Missoula, Montana 59812, United States
| | - Jakob Lindaas
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Ilana B Pollack
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Emily V Fischer
- Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Timothy H Bertram
- Department of Chemistry, University of Wisconsin, Madison Wisconsin 53706, United States
| | - Joel A Thornton
- Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States
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14
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Chen X, Millet DB, Singh HB, Wisthaler A, Apel EC, Atlas EL, Blake DR, Bourgeois I, Brown SS, Crounse JD, de Gouw JA, Flocke FM, Fried A, Heikes BG, Hornbrook RS, Mikoviny T, Min KE, Müller M, Neuman JA, O'Sullivan DW, Peischl J, Pfister GG, Richter D, Roberts JM, Ryerson TB, Shertz SR, Thompson CR, Treadaway V, Veres PR, Walega J, Warneke C, Washenfelder RA, Weibring P, Yuan B. On the sources and sinks of atmospheric VOCs: an integrated analysis of recent aircraft campaigns over North America. Atmos Chem Phys 2019; 19:9097-9123. [PMID: 33688334 PMCID: PMC7939023 DOI: 10.5194/acp-19-9097-2019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We apply a high-resolution chemical transport model (GEOS-Chem CTM) with updated treatment of volatile organic compounds (VOCs) and a comprehensive suite of airborne datasets over North America to (i) characterize the VOC budget and (ii) test the ability of current models to capture the distribution and reactivity of atmospheric VOCs over this region. Biogenic emissions dominate the North American VOC budget in the model, accounting for 70 % and 95 % of annually emitted VOC carbon and reactivity, respectively. Based on current inventories anthropogenic emissions have declined to the point where biogenic emissions are the dominant summertime source of VOC reactivity even in most major North American cities. Methane oxidation is a 2x larger source of nonmethane VOCs (via production of formaldehyde and methyl hydroperoxide) over North America in the model than are anthropogenic emissions. However, anthropogenic VOCs account for over half of the ambient VOC loading over the majority of the region owing to their longer aggregate lifetime. Fires can be a significant VOC source episodically but are small on average. In the planetary boundary layer (PBL), the model exhibits skill in capturing observed variability in total VOC abundance (R 2 = 0:36) and reactivity (R 2 = 0:54). The same is not true in the free troposphere (FT), where skill is low and there is a persistent low model bias (~ 60 %), with most (27 of 34) model VOCs underestimated by more than a factor of 2. A comparison of PBL: FT concentration ratios over the southeastern US points to a misrepresentation of PBL ventilation as a contributor to these model FT biases. We also find that a relatively small number of VOCs (acetone, methanol, ethane, acetaldehyde, formaldehyde, isoprene C oxidation products, methyl hydroperoxide) drive a large fraction of total ambient VOC reactivity and associated model biases; research to improve understanding of their budgets is thus warranted. A source tracer analysis suggests a current overestimate of biogenic sources for hydroxyacetone, methyl ethyl ketone and glyoxal, an underestimate of biogenic formic acid sources, and an underestimate of peroxyacetic acid production across biogenic and anthropogenic precursors. Future work to improve model representations of vertical transport and to address the VOC biases discussed are needed to advance predictions of ozone and SOA formation.
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Affiliation(s)
- Xin Chen
- Department of Soil, Water, and Climate, University of Minnesota, Minneapolis-Saint Paul, MN, USA
| | - Dylan B. Millet
- Department of Soil, Water, and Climate, University of Minnesota, Minneapolis-Saint Paul, MN, USA
| | | | - Armin Wisthaler
- Institute for Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria
- Department of Chemistry, University of Oslo, Oslo, Norway
| | - Eric C. Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Elliot L. Atlas
- Department of Atmospheric Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA
| | - Donald R. Blake
- Department of Chemistry, University of California, Irvine, Irvine, CA, USA
| | - Ilann Bourgeois
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - Steven S. Brown
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - John D. Crounse
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - Joost A. de Gouw
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - Frank M. Flocke
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Alan Fried
- Institute of Arctic & Alpine Research, University of Colorado, Boulder, CO, USA
| | - Brian G. Heikes
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Tomas Mikoviny
- Department of Chemistry, University of Oslo, Oslo, Norway
| | - Kyung-Eun Min
- School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - Markus Müller
- Institute for Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria
| | - J. Andrew Neuman
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | | | - Jeff Peischl
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - Gabriele G. Pfister
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Dirk Richter
- Institute of Arctic & Alpine Research, University of Colorado, Boulder, CO, USA
| | - James M. Roberts
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - Thomas B. Ryerson
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - Stephen R. Shertz
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - Chelsea R. Thompson
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - Victoria Treadaway
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
| | - Patrick R. Veres
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - James Walega
- Institute of Arctic & Alpine Research, University of Colorado, Boulder, CO, USA
| | - Carsten Warneke
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | | | - Petter Weibring
- Institute of Arctic & Alpine Research, University of Colorado, Boulder, CO, USA
| | - Bin Yuan
- Institute for Environmental and Climate Research, Jinan University, Guangzhou, China
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15
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Wang S, Apel EC, Hornbrook RS, Hills A, Emmons LK, Tilmes S, Lamarque JF, Jimenez JL, Campuzano-Jost P, Nault BA, Crounse JD, Wennberg PO, Ryerson TB, Thompson CR, Peischl J, Moore F, Nance D, Hall B, Elkins J, Tanner D, Gregory Huey L, Hall SR, Ullmann K, Orlando JJ, Tyndall GS, Flocke FM, Ray E, Hanisco TF, Wolfe GM, St.Clair J, Commane R, Daube B, Barletta B, Blake DR, Weinzierl B, Dollner M, Conley A, Vitt F, Wofsy SC, Riemer DD. Atmospheric Acetaldehyde: Importance of Air-Sea Exchange and a Missing Source in the Remote Troposphere. Geophys Res Lett 2019; 46:5601-5613. [PMID: 32606484 PMCID: PMC7325730 DOI: 10.1029/2019gl082034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/18/2019] [Indexed: 06/02/2023]
Abstract
We report airborne measurements of acetaldehyde (CH3CHO) during the first and second deployments of the National Aeronautics and Space Administration (NASA) Atmospheric Tomography Mission (ATom). The budget of CH3CHO is examined using the Community Atmospheric Model with chemistry (CAM-chem), with a newly-developed online air-sea exchange module. The upper limit of the global ocean net emission of CH3CHO is estimated to be 34 Tg a-1 (42 Tg a-1 if considering bubble-mediated transfer), and the ocean impacts on tropospheric CH3CHO are mostly confined to the marine boundary layer. Our analysis suggests that there is an unaccounted CH3CHO source in the remote troposphere and that organic aerosols can only provide a fraction of this missing source. We propose that peroxyacetic acid (PAA) is an ideal indicator of the rapid CH3CHO production in the remote troposphere. The higher-than-expected CH3CHO measurements represent a missing sink of hydroxyl radicals (and halogen radical) in current chemistry-climate models.
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Affiliation(s)
- Siyuan Wang
- Advanced Study Program (ASP), National Center for Atmospheric Research, Boulder CO, 80301
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Eric C. Apel
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Rebecca S. Hornbrook
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Alan Hills
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Louisa K. Emmons
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Simone Tilmes
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
- Climate and Global Dynamics, National Center for Atmospheric Research, Boulder CO, 80301
| | - Jean-François Lamarque
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
- Climate and Global Dynamics, National Center for Atmospheric Research, Boulder CO, 80301
| | - Jose L. Jimenez
- Department of Chemistry and Biochemistry, University of Colorado Boulder, CO 80309
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
| | - Pedro Campuzano-Jost
- Department of Chemistry and Biochemistry, University of Colorado Boulder, CO 80309
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
| | - Benjamin A. Nault
- Department of Chemistry and Biochemistry, University of Colorado Boulder, CO 80309
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
| | - John D. Crounse
- Division of Engineering and Applied Science, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
| | - Paul O. Wennberg
- Division of Engineering and Applied Science, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
| | - Thomas B. Ryerson
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Chelsea R. Thompson
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Jeff Peischl
- Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, CO 80309
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Fred Moore
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - David Nance
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Brad Hall
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - James Elkins
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - David Tanner
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332
| | - L. Gregory Huey
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332
| | - Samuel R. Hall
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Kirk Ullmann
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - John J. Orlando
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Geoff S. Tyndall
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Frank M. Flocke
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Eric Ray
- Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305
| | - Thomas F. Hanisco
- Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771
| | - Glenn M. Wolfe
- Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771
- Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD 21228
| | - Jason St.Clair
- Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771
- Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD 21228
| | - Róisín Commane
- Harvard School of Engineering and Applied Sciences, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
- Department of Earth & Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964
| | - Bruce Daube
- Harvard School of Engineering and Applied Sciences, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
| | - Barbara Barletta
- Department of Chemistry, University of California Irvine, Irvine; CA 92697
| | - Donald R. Blake
- Department of Chemistry, University of California Irvine, Irvine; CA 92697
| | - Bernadett Weinzierl
- Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Wien, Austria
| | - Maximilian Dollner
- Faculty of Physics, Aerosol Physics and Environmental Physics, University of Vienna, Wien, Austria
| | - Andrew Conley
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Francis Vitt
- Atmospheric Chemistry Observations and Modeling, National Center for Atmospheric Research, Boulder CO, 80301
| | - Steven C. Wofsy
- Harvard School of Engineering and Applied Sciences, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138
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16
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Murphy DM, Froyd KD, Apel E, Blake D, Blake N, Evangeliou N, Hornbrook RS, Peischl J, Ray E, Ryerson TB, Thompson C, Stohl A. An aerosol particle containing enriched uranium encountered in the remote upper troposphere. J Environ Radioact 2018; 184-185:95-100. [PMID: 29407642 DOI: 10.1016/j.jenvrad.2018.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 01/05/2018] [Accepted: 01/07/2018] [Indexed: 06/07/2023]
Abstract
We describe a submicron aerosol particle sampled at an altitude of 7 km near the Aleutian Islands that contained a small percentage of enriched uranium oxide. 235U was 3.1 ± 0.5% of 238U. During twenty years of aircraft sampling of millions of particles in the global atmosphere, we have rarely encountered a particle with a similarly high content of 238U and never a particle with enriched 235U. The bulk of the particle consisted of material consistent with combustion of heavy fuel oil. Analysis of wind trajectories and particle dispersion model results show that the particle could have originated from a variety of areas across Asia. The source of such a particle is unclear, and the particle is described here in case it indicates a novel source where enriched uranium was dispersed.
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Affiliation(s)
- D M Murphy
- NOAA ESRL Chemical Sciences Division, Boulder, CO, USA.
| | - K D Froyd
- NOAA ESRL Chemical Sciences Division, Boulder, CO, USA; Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - E Apel
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - D Blake
- Department of Chemistry, University of California, Irvine, Irvine, CA, USA
| | - N Blake
- Department of Chemistry, University of California, Irvine, Irvine, CA, USA
| | - N Evangeliou
- NILU - Norwegian Institute for Air Research, Norway
| | - R S Hornbrook
- Atmospheric Chemistry Observations & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
| | - J Peischl
- NOAA ESRL Chemical Sciences Division, Boulder, CO, USA; Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - E Ray
- NOAA ESRL Chemical Sciences Division, Boulder, CO, USA; Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - T B Ryerson
- NOAA ESRL Chemical Sciences Division, Boulder, CO, USA
| | - C Thompson
- NOAA ESRL Chemical Sciences Division, Boulder, CO, USA; Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - A Stohl
- NILU - Norwegian Institute for Air Research, Norway
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17
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Anderson DC, Nicely JM, Wolfe GM, Hanisco TF, Salawitch RJ, Canty TP, Dickerson RR, Apel EC, Baidar S, Bannan TJ, Blake NJ, Chen D, Dix B, Fernandez RP, Hall SR, Hornbrook RS, Huey LG, Josse B, Jöckel P, Kinnison DE, Koenig TK, LeBreton M, Marécal V, Morgenstern O, Oman LD, Pan LL, Percival C, Plummer D, Revell LE, Rozanov E, Saiz-Lopez A, Stenke A, Sudo K, Tilmes S, Ullmann K, Volkamer R, Weinheimer AJ, Zeng G. Formaldehyde in the Tropical Western Pacific: Chemical sources and sinks, convective transport, and representation in CAM-Chem and the CCMI models. J Geophys Res Atmos 2017. [PMID: 29527424 DOI: 10.1002/2017ja024474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Formaldehyde (HCHO) directly affects the atmospheric oxidative capacity through its effects on HOx. In remote marine environments, such as the Tropical Western Pacific (TWP), it is particularly important to understand the processes controlling the abundance of HCHO because model output from these regions is used to correct satellite retrievals of HCHO. Here, we have used observations from the CONTRAST field campaign, conducted during January and February 2014, to evaluate our understanding of the processes controlling the distribution of HCHO in the TWP as well as its representation in chemical transport/climate models. Observed HCHO mixing ratios varied from ~500 pptv near the surface to ~75 pptv in the upper troposphere. Recent convective transport of near surface HCHO and its precursors, acetaldehyde and possibly methyl hydroperoxide, increased upper tropospheric HCHO mixing ratios by ~33% (22 pptv); this air contained roughly 60% less NO than more aged air. Output from the CAM-Chem chemistry transport model (2014 meteorology) as well as nine chemistry climate models from the Chemistry-Climate Model Initiative (free-running meteorology) are found to uniformly underestimate HCHO columns derived from in situ observations by between 4 and 50%. This underestimate of HCHO likely results from a near factor of two underestimate of NO in most models, which strongly suggests errors in NOx emissions inventories and/or in the model chemical mechanisms. Likewise, the lack of oceanic acetaldehyde emissions and potential errors in the model acetaldehyde chemistry lead to additional underestimates in modeled HCHO of up to 75 pptv (~15%) in the lower troposphere.
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Affiliation(s)
- Daniel C Anderson
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
| | - Julie M Nicely
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
- Universities Space Research Association, Columbia, Maryland, USA
| | - Glenn M Wolfe
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
- Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, Maryland, USA
| | - Thomas F Hanisco
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | - Ross J Salawitch
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
- Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA
| | - Timothy P Canty
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
| | - Russell R Dickerson
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
| | - Eric C Apel
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Sunil Baidar
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado, USA
| | | | - Nicola J Blake
- Department of Chemistry, University of California, Irvine, California, USA
| | - Dexian Chen
- School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Barbara Dix
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
| | - Rafael P Fernandez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain
- Department of Natural Science, National Research Council (CONICET), FCEN-UNCuyo, Mendoza, Argentina
| | - Samuel R Hall
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | | | - L Gregory Huey
- School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Beatrice Josse
- Centre National de Recherche Météorologique, UMR3589, Méteo-France-CNRS, Toulouse, France
| | - Patrick Jöckel
- Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
| | | | - Theodore K Koenig
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado, USA
| | - Michael LeBreton
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Virginie Marécal
- Centre National de Recherche Météorologique, UMR3589, Méteo-France-CNRS, Toulouse, France
| | - Olaf Morgenstern
- National Institute of Water and Atmospheric Research, Wellington, New Zealand
| | - Luke D Oman
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | - Laura L Pan
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Carl Percival
- Department of Chemistry, University of Manchester, UK
| | - David Plummer
- Canadian Centre for Climate Modeling and Analysis, Environment Canada, Victoria, British Columbia, Canada
| | - Laura E Revell
- Bodeker Scientific, Alexandra, New Zealand
- ETH Zürich, Institute for Atmospheric and Climate Science, Zürich, Switzerland
| | - Eugene Rozanov
- ETH Zürich, Institute for Atmospheric and Climate Science, Zürich, Switzerland
- Physikalisch-Meteorologisches Observatorium Davos World Radiation Centre, Davos Dorf, Switzerland
| | - Alfonso Saiz-Lopez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain
| | - Andrea Stenke
- ETH Zürich, Institute for Atmospheric and Climate Science, Zürich, Switzerland
| | - Kengo Sudo
- Nagoya University, Graduate School of Environmental Studies, Nagoya, Japan
- Japan Marine-Earth Science and Technology, Yokohama, Japan
| | - Simone Tilmes
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Kirk Ullmann
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Rainer Volkamer
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado, USA
| | | | - Guang Zeng
- National Institute of Water and Atmospheric Research, Wellington, New Zealand
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18
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Anderson DC, Nicely JM, Wolfe GM, Hanisco TF, Salawitch RJ, Canty TP, Dickerson RR, Apel EC, Baidar S, Bannan TJ, Blake NJ, Chen D, Dix B, Fernandez RP, Hall SR, Hornbrook RS, Huey LG, Josse B, Jöckel P, Kinnison DE, Koenig TK, LeBreton M, Marécal V, Morgenstern O, Oman LD, Pan LL, Percival C, Plummer D, Revell LE, Rozanov E, Saiz-Lopez A, Stenke A, Sudo K, Tilmes S, Ullmann K, Volkamer R, Weinheimer AJ, Zeng G. Formaldehyde in the Tropical Western Pacific: Chemical sources and sinks, convective transport, and representation in CAM-Chem and the CCMI models. J Geophys Res Atmos 2017; 122:11201-11226. [PMID: 29527424 PMCID: PMC5839129 DOI: 10.1002/2016jd026121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Formaldehyde (HCHO) directly affects the atmospheric oxidative capacity through its effects on HOx. In remote marine environments, such as the Tropical Western Pacific (TWP), it is particularly important to understand the processes controlling the abundance of HCHO because model output from these regions is used to correct satellite retrievals of HCHO. Here, we have used observations from the CONTRAST field campaign, conducted during January and February 2014, to evaluate our understanding of the processes controlling the distribution of HCHO in the TWP as well as its representation in chemical transport/climate models. Observed HCHO mixing ratios varied from ~500 pptv near the surface to ~75 pptv in the upper troposphere. Recent convective transport of near surface HCHO and its precursors, acetaldehyde and possibly methyl hydroperoxide, increased upper tropospheric HCHO mixing ratios by ~33% (22 pptv); this air contained roughly 60% less NO than more aged air. Output from the CAM-Chem chemistry transport model (2014 meteorology) as well as nine chemistry climate models from the Chemistry-Climate Model Initiative (free-running meteorology) are found to uniformly underestimate HCHO columns derived from in situ observations by between 4 and 50%. This underestimate of HCHO likely results from a near factor of two underestimate of NO in most models, which strongly suggests errors in NOx emissions inventories and/or in the model chemical mechanisms. Likewise, the lack of oceanic acetaldehyde emissions and potential errors in the model acetaldehyde chemistry lead to additional underestimates in modeled HCHO of up to 75 pptv (~15%) in the lower troposphere.
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Affiliation(s)
- Daniel C Anderson
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
| | - Julie M Nicely
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
- Universities Space Research Association, Columbia, Maryland, USA
| | - Glenn M Wolfe
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
- Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, Maryland, USA
| | - Thomas F Hanisco
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | - Ross J Salawitch
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
- Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA
| | - Timothy P Canty
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
| | - Russell R Dickerson
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland, USA
| | - Eric C Apel
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Sunil Baidar
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado, USA
| | | | - Nicola J Blake
- Department of Chemistry, University of California, Irvine, California, USA
| | - Dexian Chen
- School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Barbara Dix
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
| | - Rafael P Fernandez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain
- Department of Natural Science, National Research Council (CONICET), FCEN-UNCuyo, Mendoza, Argentina
| | - Samuel R Hall
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | | | - L Gregory Huey
- School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Beatrice Josse
- Centre National de Recherche Météorologique, UMR3589, Méteo-France-CNRS, Toulouse, France
| | - Patrick Jöckel
- Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany
| | | | - Theodore K Koenig
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado, USA
| | - Michael LeBreton
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Virginie Marécal
- Centre National de Recherche Météorologique, UMR3589, Méteo-France-CNRS, Toulouse, France
| | - Olaf Morgenstern
- National Institute of Water and Atmospheric Research, Wellington, New Zealand
| | - Luke D Oman
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | - Laura L Pan
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Carl Percival
- Department of Chemistry, University of Manchester, UK
| | - David Plummer
- Canadian Centre for Climate Modeling and Analysis, Environment Canada, Victoria, British Columbia, Canada
| | - Laura E Revell
- Bodeker Scientific, Alexandra, New Zealand
- ETH Zürich, Institute for Atmospheric and Climate Science, Zürich, Switzerland
| | - Eugene Rozanov
- ETH Zürich, Institute for Atmospheric and Climate Science, Zürich, Switzerland
- Physikalisch-Meteorologisches Observatorium Davos World Radiation Centre, Davos Dorf, Switzerland
| | - Alfonso Saiz-Lopez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain
| | - Andrea Stenke
- ETH Zürich, Institute for Atmospheric and Climate Science, Zürich, Switzerland
| | - Kengo Sudo
- Nagoya University, Graduate School of Environmental Studies, Nagoya, Japan
- Japan Marine-Earth Science and Technology, Yokohama, Japan
| | - Simone Tilmes
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Kirk Ullmann
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Rainer Volkamer
- Department of Chemistry, University of Colorado, Boulder, Colorado, USA
- Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado, USA
| | | | - Guang Zeng
- National Institute of Water and Atmospheric Research, Wellington, New Zealand
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19
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Pan LL, Atlas EL, Salawitch RJ, Honomichl SB, Bresch JF, Randel WJ, Apel EC, Hornbrook RS, Weinheimer AJ, Anderson DC, Andrews SJ, Baidar S, Beaton SP, Campos TL, Carpenter LJ, Chen D, Dix B, Donets V, Hall SR, Hanisco TF, Homeyer CR, Huey LG, Jensen JB, Kaser L, Kinnison DE, Koenig TK, Lamarque JF, Liu C, Luo J, Luo ZJ, Montzka DD, Nicely JM, Pierce RB, Riemer DD, Robinson T, Romashkin P, Saiz-Lopez A, Schauffler S, Shieh O, Stell MH, Ullmann K, Vaughan G, Volkamer R, Wolfe G. The Convective Transport of Active Species in the Tropics (CONTRAST) Experiment. Bull Am Meteorol Soc 2017; 98:106-128. [PMID: 29636590 PMCID: PMC5889942 DOI: 10.1175/bams-d-14-00272.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The Convective Transport of Active Species in the Tropics (CONTRAST) experiment was conducted from Guam (13.5° N, 144.8° E) during January-February 2014. Using the NSF/NCAR Gulfstream V research aircraft, the experiment investigated the photochemical environment over the tropical western Pacific (TWP) warm pool, a region of massive deep convection and the major pathway for air to enter the stratosphere during Northern Hemisphere (NH) winter. The new observations provide a wealth of information for quantifying the influence of convection on the vertical distributions of active species. The airborne in situ measurements up to 15 km altitude fill a significant gap by characterizing the abundance and altitude variation of a wide suite of trace gases. These measurements, together with observations of dynamical and microphysical parameters, provide significant new data for constraining and evaluating global chemistry climate models. Measurements include precursor and product gas species of reactive halogen compounds that impact ozone in the upper troposphere/lower stratosphere. High accuracy, in-situ measurements of ozone obtained during CONTRAST quantify ozone concentration profiles in the UT, where previous observations from balloon-borne ozonesondes were often near or below the limit of detection. CONTRAST was one of the three coordinated experiments to observe the TWP during January-February 2014. Together, CONTRAST, ATTREX and CAST, using complementary capabilities of the three aircraft platforms as well as ground-based instrumentation, provide a comprehensive quantification of the regional distribution and vertical structure of natural and pollutant trace gases in the TWP during NH winter, from the oceanic boundary to the lower stratosphere.
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Affiliation(s)
- L L Pan
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | | | | | - S B Honomichl
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - J F Bresch
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - W J Randel
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - E C Apel
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - R S Hornbrook
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - A J Weinheimer
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - D C Anderson
- University of Maryland, College Park, Maryland, USA
| | | | - S Baidar
- University of Colorado Boulder, Boulder, Colorado, USA
| | - S P Beaton
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - T L Campos
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | | | - D Chen
- Georgia Institute of Technology, Atlanta, Georgia, USA
| | - B Dix
- University of Colorado Boulder, Boulder, Colorado, USA
| | - V Donets
- University of Miami, Florida, USA
| | - S R Hall
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - T F Hanisco
- NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
| | - C R Homeyer
- University of Oklahoma, Norman, Oklahoma, USA
| | - L G Huey
- Georgia Institute of Technology, Atlanta, Georgia, USA
| | - J B Jensen
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - L Kaser
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - D E Kinnison
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - T K Koenig
- University of Colorado Boulder, Boulder, Colorado, USA
| | - J-F Lamarque
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - C Liu
- Texas A&M University at Corpus Christi, Texas, USA
| | - J Luo
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Z J Luo
- City College of New York, New York, New York, USA
| | - D D Montzka
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - J M Nicely
- University of Maryland, College Park, Maryland, USA
| | - R B Pierce
- NOAA Satellite and Information Service (NESDIS) Center for Satellite Applications and Research (STAR), Madison Wisconsin, USA
| | | | - T Robinson
- University of Hawaii at Mānoa, Hawaii, USA
| | - P Romashkin
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - A Saiz-Lopez
- Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain
| | - S Schauffler
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - O Shieh
- University of Hawaii at Mānoa, Hawaii, USA
| | - M H Stell
- National Center for Atmospheric Research, Boulder, Colorado, USA
- Metropolitan State University, Denver, Colorado, USA
| | - K Ullmann
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - G Vaughan
- University of Manchester, Manchester, UK
| | - R Volkamer
- University of Colorado Boulder, Boulder, Colorado, USA
| | - G Wolfe
- NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
- University of Maryland Baltimore County, Baltimore, Maryland, USA
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20
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Ye C, Zhou X, Pu D, Stutz J, Festa J, Spolaor M, Tsai C, Cantrell C, Mauldin RL, Campos T, Weinheimer A, Hornbrook RS, Apel EC, Guenther A, Kaser L, Yuan B, Karl T, Haggerty J, Hall S, Ullmann K, Smith JN, Ortega J, Knote C. Rapid cycling of reactive nitrogen in the marine boundary layer. Nature 2016; 532:489-91. [PMID: 27064904 DOI: 10.1038/nature17195] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 01/28/2016] [Indexed: 12/21/2022]
Abstract
Nitrogen oxides are essential for the formation of secondary atmospheric aerosols and of atmospheric oxidants such as ozone and the hydroxyl radical, which controls the self-cleansing capacity of the atmosphere. Nitric acid, a major oxidation product of nitrogen oxides, has traditionally been considered to be a permanent sink of nitrogen oxides. However, model studies predict higher ratios of nitric acid to nitrogen oxides in the troposphere than are observed. A 'renoxification' process that recycles nitric acid into nitrogen oxides has been proposed to reconcile observations with model studies, but the mechanisms responsible for this process remain uncertain. Here we present data from an aircraft measurement campaign over the North Atlantic Ocean and find evidence for rapid recycling of nitric acid to nitrous acid and nitrogen oxides in the clean marine boundary layer via particulate nitrate photolysis. Laboratory experiments further demonstrate the photolysis of particulate nitrate collected on filters at a rate more than two orders of magnitude greater than that of gaseous nitric acid, with nitrous acid as the main product. Box model calculations based on the Master Chemical Mechanism suggest that particulate nitrate photolysis mainly sustains the observed levels of nitrous acid and nitrogen oxides at midday under typical marine boundary layer conditions. Given that oceans account for more than 70 per cent of Earth's surface, we propose that particulate nitrate photolysis could be a substantial tropospheric nitrogen oxide source. Recycling of nitrogen oxides in remote oceanic regions with minimal direct nitrogen oxide emissions could increase the formation of tropospheric oxidants and secondary atmospheric aerosols on a global scale.
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Affiliation(s)
- Chunxiang Ye
- Wadsworth Center, New York State Department of Health, Albany, New York, USA
| | - Xianliang Zhou
- Wadsworth Center, New York State Department of Health, Albany, New York, USA.,Department of Environmental Health Sciences, State University of New York, Albany, New York, USA
| | - Dennis Pu
- Department of Environmental Health Sciences, State University of New York, Albany, New York, USA
| | - Jochen Stutz
- Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles (UCLA), California, USA
| | - James Festa
- Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles (UCLA), California, USA
| | - Max Spolaor
- Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles (UCLA), California, USA
| | - Catalina Tsai
- Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles (UCLA), California, USA
| | - Christopher Cantrell
- Department of Atmospheric and Oceanic Sciences, University of Colorado at Boulder, Boulder, Colorado, USA
| | - Roy L Mauldin
- Department of Atmospheric and Oceanic Sciences, University of Colorado at Boulder, Boulder, Colorado, USA.,Department of Physics, University of Helsinki, Helsinki, Finland
| | - Teresa Campos
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | | | | | - Eric C Apel
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Alex Guenther
- Pacific Northwest National Laboratory, Richland, Washington, USA
| | - Lisa Kaser
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Bin Yuan
- NOAA, Earth System Research Laboratory, Chemical Sciences Division, Boulder, Colorado, USA.,Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Boulder, Colorado, USA
| | - Thomas Karl
- Institute for Meteorology and Geophysics, University of Innsbruck, Innsbruck, Austria
| | - Julie Haggerty
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Samuel Hall
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Kirk Ullmann
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - James N Smith
- National Center for Atmospheric Research, Boulder, Colorado, USA.,University of Eastern Finland, Kuopio, Finland
| | - John Ortega
- National Center for Atmospheric Research, Boulder, Colorado, USA
| | - Christoph Knote
- National Center for Atmospheric Research, Boulder, Colorado, USA
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21
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Anderson DC, Nicely JM, Salawitch RJ, Canty TP, Dickerson RR, Hanisco TF, Wolfe GM, Apel EC, Atlas E, Bannan T, Bauguitte S, Blake NJ, Bresch JF, Campos TL, Carpenter LJ, Cohen MD, Evans M, Fernandez RP, Kahn BH, Kinnison DE, Hall SR, Harris NRP, Hornbrook RS, Lamarque JF, Le Breton M, Lee JD, Percival C, Pfister L, Pierce RB, Riemer DD, Saiz-Lopez A, Stunder BJB, Thompson AM, Ullmann K, Vaughan A, Weinheimer AJ. A pervasive role for biomass burning in tropical high ozone/low water structures. Nat Commun 2016; 7:10267. [PMID: 26758808 PMCID: PMC4735513 DOI: 10.1038/ncomms10267] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 11/23/2015] [Indexed: 11/09/2022] Open
Abstract
Air parcels with mixing ratios of high O3 and low H2O (HOLW) are common features in the tropical western Pacific (TWP) mid-troposphere (300-700 hPa). Here, using data collected during aircraft sampling of the TWP in winter 2014, we find strong, positive correlations of O3 with multiple biomass burning tracers in these HOLW structures. Ozone levels in these structures are about a factor of three larger than background. Models, satellite data and aircraft observations are used to show fires in tropical Africa and Southeast Asia are the dominant source of high O3 and that low H2O results from large-scale descent within the tropical troposphere. Previous explanations that attribute HOLW structures to transport from the stratosphere or mid-latitude troposphere are inconsistent with our observations. This study suggest a larger role for biomass burning in the radiative forcing of climate in the remote TWP than is commonly appreciated.
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Affiliation(s)
- Daniel C Anderson
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA
| | - Julie M Nicely
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Ross J Salawitch
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA.,Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.,Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland 20742, USA
| | - Timothy P Canty
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA
| | - Russell R Dickerson
- Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA
| | - Thomas F Hanisco
- NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
| | - Glenn M Wolfe
- NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.,Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA
| | - Eric C Apel
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Elliot Atlas
- Department of Atmospheric Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149, USA
| | - Thomas Bannan
- Centre for Atmospheric Science, School of Earth, Atmospheric, and Environmental Science, The University of Manchester, Manchester M13 9PL, UK
| | | | - Nicola J Blake
- Deparment of Chemistry, University of California, Irvine, California 92697, USA
| | - James F Bresch
- Mesoscale and Microscale Meteorology Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Teresa L Campos
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Lucy J Carpenter
- Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York YO10 5DD, UK
| | - Mark D Cohen
- NOAA Air Resources Laboratory, College Park, Maryland 20740, USA
| | - Mathew Evans
- Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York YO10 5DD, UK.,National Centre for Atmospheric Science, Department of Chemistry, University of York, York YO10 5DD, UK
| | - Rafael P Fernandez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid 28006, Spain.,Department of Natural Science, National Research Council (CONICET), FCEN-UNCuyo, Mendoza 5501, Argentina
| | - Brian H Kahn
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
| | - Douglas E Kinnison
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Samuel R Hall
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Neil R P Harris
- Department of Chemistry, Cambridge University, Cambridge CB2 1EW, UK
| | - Rebecca S Hornbrook
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Jean-Francois Lamarque
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA.,Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Michael Le Breton
- Centre for Atmospheric Science, School of Earth, Atmospheric, and Environmental Science, The University of Manchester, Manchester M13 9PL, UK
| | - James D Lee
- National Centre for Atmospheric Science, Department of Chemistry, University of York, York YO10 5DD, UK
| | - Carl Percival
- Centre for Atmospheric Science, School of Earth, Atmospheric, and Environmental Science, The University of Manchester, Manchester M13 9PL, UK
| | - Leonhard Pfister
- Earth Sciences Division, NASA Ames Research Center, Moffett Field, California 94035, USA
| | - R Bradley Pierce
- NOAA/NESDIS Center for Satellite Applications and Research, Madison, Wisconsin 53706, USA
| | - Daniel D Riemer
- Department of Atmospheric Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149, USA
| | - Alfonso Saiz-Lopez
- Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid 28006, Spain
| | | | - Anne M Thompson
- NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
| | - Kirk Ullmann
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
| | - Adam Vaughan
- National Centre for Atmospheric Science, Department of Chemistry, University of York, York YO10 5DD, UK
| | - Andrew J Weinheimer
- Atmospheric Chemistry Observation and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80305, USA
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22
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Stephens CR, Shepson PB, Steffen A, Bottenheim JW, Liao J, Huey LG, Apel E, Weinheimer A, Hall SR, Cantrell C, Sive BC, Knapp DJ, Montzka DD, Hornbrook RS. The relative importance of chlorine and bromine radicals in the oxidation of atmospheric mercury at Barrow, Alaska. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd016649] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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