101
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Shamjad PM, Tripathi SN, Pathak R, Hallquist M, Arola A, Bergin MH. Contribution of Brown Carbon to Direct Radiative Forcing over the Indo-Gangetic Plain. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:10474-81. [PMID: 26237141 DOI: 10.1021/acs.est.5b03368] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The Indo-Gangetic Plain is a region of known high aerosol loading with substantial amounts of carbonaceous aerosols from a variety of sources, often dominated by biomass burning. Although black carbon has been shown to play an important role in the absorption of solar energy and hence direct radiative forcing (DRF), little is known regarding the influence of light absorbing brown carbon (BrC) on the radiative balance in the region. With this in mind, a study was conducted for a one month period during the winter-spring season of 2013 in Kanpur, India that measured aerosol chemical and physical properties that were used to estimate the sources of carbonaceous aerosols, as well as parameters necessary to estimate direct forcing by aerosols and the contribution of BrC absorption to the atmospheric energy balance. Positive matrix factorization analyses, based on aerosol mass spectrometer measurements, resolved organic carbon into four factors including low-volatile oxygenated organic aerosols, semivolatile oxygenated organic aerosols, biomass burning, and hydrocarbon like organic aerosols. Three-wavelength absorption and scattering coefficient measurements from a Photo Acoustic Soot Spectrometer were used to estimate aerosol optical properties and estimate the relative contribution of BrC to atmospheric absorption. Mean ± standard deviation values of short-wave cloud free clear sky DRF exerted by total aerosols at the top of atmosphere, surface and within the atmospheric column are -6.1 ± 3.2, -31.6 ± 11, and 25.5 ± 10.2 W/m(2), respectively. During days dominated by biomass burning the absorption of solar energy by aerosols within the atmosphere increased by ∼35%, accompanied by a 25% increase in negative surface DRF. DRF at the top of atmosphere during biomass burning days decreased in negative magnitude by several W/m(2) due to enhanced atmospheric absorption by biomass aerosols, including BrC. The contribution of BrC to atmospheric absorption is estimated to range from on average 2.6 W/m(2) for typical ambient conditions to 3.6 W/m(2) during biomass burning days. This suggests that BrC accounts for 10-15% of the total aerosol absorption in the atmosphere, indicating that BrC likely plays an important role in surface and boundary temperature as well as climate.
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Affiliation(s)
- P M Shamjad
- Department of Civil Engineering, and Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur , Kanpur, India
| | - S N Tripathi
- Department of Civil Engineering, and Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur , Kanpur, India
| | - Ravi Pathak
- Atmospheric Science, Department of Chemistry and Molecular Biology, University of Gothenburg , SE-41296 Gothenburg, Sweden
| | - M Hallquist
- Atmospheric Science, Department of Chemistry and Molecular Biology, University of Gothenburg , SE-41296 Gothenburg, Sweden
| | - Antti Arola
- Finnish Meteorological Institute , P.O. Box 1627, 70211 Kuopio, Finland
| | - M H Bergin
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology , Atlanta, Georgia, United States
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102
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Lu Z, Streets DG, Winijkul E, Yan F, Chen Y, Bond TC, Feng Y, Dubey MK, Liu S, Pinto JP, Carmichael GR. Light absorption properties and radiative effects of primary organic aerosol emissions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:4868-4877. [PMID: 25811601 DOI: 10.1021/acs.est.5b00211] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Organic aerosols (OAs) in the atmosphere affect Earth's energy budget by not only scattering but also absorbing solar radiation due to the presence of the so-called "brown carbon" (BrC) component. However, the absorptivities of OAs are not represented or are poorly represented in current climate and chemical transport models. In this study, we provide a method to constrain the BrC absorptivity at the emission inventory level using recent laboratory and field observations. We review available measurements of the light-absorbing primary OA (POA), and quantify the wavelength-dependent imaginary refractive indices (kOA, the fundamental optical parameter determining the particle's absorptivity) and their uncertainties for the bulk POA emitted from biomass/biofuel, lignite, propane, and oil combustion sources. In particular, we parametrize the kOA of biomass/biofuel combustion sources as a function of the black carbon (BC)-to-OA ratio, indicating that the absorptive properties of POA depend strongly on burning conditions. The derived fuel-type-based kOA profiles are incorporated into a global carbonaceous aerosol emission inventory, and the integrated kOA values of sectoral and total POA emissions are presented. Results of a simple radiative transfer model show that the POA absorptivity warms the atmosphere significantly and leads to ∼27% reduction in the amount of the net global average POA cooling compared to results from the nonabsorbing assumption.
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Affiliation(s)
- Zifeng Lu
- †Energy Systems Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - David G Streets
- †Energy Systems Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Ekbordin Winijkul
- †Energy Systems Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Fang Yan
- †Energy Systems Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Yanju Chen
- ‡Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, Urbana, Illinois 61801, United States
| | - Tami C Bond
- ‡Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, Urbana, Illinois 61801, United States
| | - Yan Feng
- §Environmental Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Manvendra K Dubey
- ∥Earth and Environmental Sciences Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - Shang Liu
- ∥Earth and Environmental Sciences Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - Joseph P Pinto
- ⊥National Center for Environmental Assessment, U.S. EPA, 4930 Page Road, Research Triangle Park, Durham, North Carolina 27709, United States
| | - Gregory R Carmichael
- #Department of Chemical and Biochemical Engineering, The University of Iowa, 4133 Seamans Center, Iowa City, Iowa 52242, United States
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103
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Moise T, Flores JM, Rudich Y. Optical Properties of Secondary Organic Aerosols and Their Changes by Chemical Processes. Chem Rev 2015; 115:4400-39. [DOI: 10.1021/cr5005259] [Citation(s) in RCA: 242] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Tamar Moise
- Department of Earth and Planetary
Sciences, Weizmann Institute, Rehovot 76100, Israel
| | - J. Michel Flores
- Department of Earth and Planetary
Sciences, Weizmann Institute, Rehovot 76100, Israel
| | - Yinon Rudich
- Department of Earth and Planetary
Sciences, Weizmann Institute, Rehovot 76100, Israel
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104
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Affiliation(s)
| | | | - Sergey A. Nizkorodov
- Department
of Chemistry, University of California, Irvine, Irvine, California 92697, United States
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105
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Phillips SM, Smith GD. Further Evidence for Charge Transfer Complexes in Brown Carbon Aerosols from Excitation–Emission Matrix Fluorescence Spectroscopy. J Phys Chem A 2014; 119:4545-51. [DOI: 10.1021/jp510709e] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Sabrina M. Phillips
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Geoffrey D. Smith
- Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
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106
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Soot superaggregates from flaming wildfires and their direct radiative forcing. Sci Rep 2014; 4:5508. [PMID: 24981204 PMCID: PMC4076688 DOI: 10.1038/srep05508] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 06/09/2014] [Indexed: 11/12/2022] Open
Abstract
Wildfires contribute significantly to global soot emissions, yet their aerosol formation mechanisms and resulting particle properties are poorly understood and parameterized in climate models. The conventional view holds that soot is formed via the cluster-dilute aggregation mechanism in wildfires and emitted as aggregates with fractal dimension Df ≈ 1.8 mobility diameter Dm ≤ 1 μm, and aerodynamic diameter Da ≤ 300 nm. Here we report the ubiquitous presence of soot superaggregates (SAs) in the outflow from a major wildfire in India. SAs are porous, low-density aggregates of cluster-dilute aggregates with characteristic Df ≈ 2.6, Dm > 1 μm, and Da ≤ 300 nm that form via the cluster-dense aggregation mechanism. We present additional observations of soot SAs in wildfire smoke-laden air masses over Northern California, New Mexico, and Mexico City. We estimate that SAs contribute, per unit optical depth, up to 35% less atmospheric warming than freshly-emitted (Df ≈ 1.8) aggregates, and ≈90% more warming than the volume-equivalent spherical soot particles simulated in climate models.
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107
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Morphology and mixing state of individual freshly emitted wildfire carbonaceous particles. Nat Commun 2014; 4:2122. [PMID: 23824042 PMCID: PMC3715871 DOI: 10.1038/ncomms3122] [Citation(s) in RCA: 227] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 06/06/2013] [Indexed: 11/11/2022] Open
Abstract
Biomass burning is one of the largest sources of carbonaceous aerosols in the atmosphere, significantly affecting earth’s radiation budget and climate. Tar balls, abundant in biomass burning smoke, absorb sunlight and have highly variable optical properties, typically not accounted for in climate models. Here we analyse single biomass burning particles from the Las Conchas fire (New Mexico, 2011) using electron microscopy. We show that the relative abundance of tar balls (80%) is 10 times greater than soot particles (8%). We also report two distinct types of tar balls; one less oxidized than the other. Furthermore, the mixing of soot particles with other material affects their optical, chemical and physical properties. We quantify the morphology of soot particles and classify them into four categories: ~50% are embedded (heavily coated), ~34% are partly coated, ~12% have inclusions and~4% are bare. Inclusion of these observations should improve climate model performances. Biomass burning is a major source of carbonaceous particles, including tar balls and soot, that affect earth’s climate. Studying a wildfire plume, this work identifies two types of tar balls and classifies soot according to its mixing state with implications for the calculation of aerosol radiative forcing.
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108
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Lack DA, Moosmüller H, McMeeking GR, Chakrabarty RK, Baumgardner D. Characterizing elemental, equivalent black, and refractory black carbon aerosol particles: a review of techniques, their limitations and uncertainties. Anal Bioanal Chem 2014; 406:99-122. [PMID: 24297322 PMCID: PMC3877426 DOI: 10.1007/s00216-013-7402-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 09/18/2013] [Accepted: 09/25/2013] [Indexed: 12/05/2022]
Abstract
Elemental-, equivalent black- and refractory black-carbon are terms that have been defined in order to dissect the more general term, black carbon, into its component parts related to its specific chemical and optical properties and its impact on climate and health. Recent publications have attempted to clarify the meaning of these terms with respect to their environmental impact, particularly on climate. Here, we focus on the measurement aspects, reviewing the most commonly implemented techniques for the direct and indirect derivation of black carbon properties, their strengths, limitations, and uncertainties, and provide a non-exhaustive bibliography where the reader can find more detailed information. This review paper is designed as a guide for those wishing to learn about the current state of black carbon measurement instrumentation, how calibration is carried out, when one instrument may have the advantage over another, and where new techniques are needed to fill important knowledge gaps.
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Affiliation(s)
- Daniel A. Lack
- NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305-3337 USA
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309 USA
| | | | - Gavin R. McMeeking
- Droplet Measurement Technologies, 2545 Central Avenue, Boulder, CO 80301 USA
| | | | - Darrel Baumgardner
- Droplet Measurement Technologies, 2545 Central Avenue, Boulder, CO 80301 USA
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109
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Flores JM, Washenfelder RA, Adler G, Lee HJ, Segev L, Laskin J, Laskin A, Nizkorodov SA, Brown SS, Rudich Y. Complex refractive indices in the near-ultraviolet spectral region of biogenic secondary organic aerosol aged with ammonia. Phys Chem Chem Phys 2014; 16:10629-42. [DOI: 10.1039/c4cp01009d] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Distribution of the number of N atoms and the change in the complex refractive index of unreacted and NH3-aged limonene SOA.
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Affiliation(s)
- J. M. Flores
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
| | - R. A. Washenfelder
- Cooperative Institute for Research in Environmental Sciences
- University of Colorado
- Boulder, USA
- Chemical Sciences Division
- Earth System Research Laboratory
| | - G. Adler
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
| | - H. J. Lee
- Department of Chemistry
- University of California
- Irvine, USA
| | - L. Segev
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
| | - J. Laskin
- Physical Sciences Division
- Pacific Northwest National Laboratory
- Richland, USA
| | - A. Laskin
- Environmental Molecular Sciences Laboratory
- Pacific Northwest National Laboratory
- Richland, USA
| | | | - S. S. Brown
- Chemical Sciences Division
- Earth System Research Laboratory
- National Oceanic and Atmospheric Administration
- Boulder, USA
| | - Y. Rudich
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
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110
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Lack DA, Moosmüller H, McMeeking GR, Chakrabarty RK, Baumgardner D. Characterizing elemental, equivalent black, and refractory black carbon aerosol particles: a review of techniques, their limitations and uncertainties. Anal Bioanal Chem 2014; 406:99-122. [PMID: 24297322 DOI: 10.1007/s00216-013-7402.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 09/18/2013] [Accepted: 09/25/2013] [Indexed: 05/26/2023]
Abstract
Elemental-, equivalent black- and refractory black-carbon are terms that have been defined in order to dissect the more general term, black carbon, into its component parts related to its specific chemical and optical properties and its impact on climate and health. Recent publications have attempted to clarify the meaning of these terms with respect to their environmental impact, particularly on climate. Here, we focus on the measurement aspects, reviewing the most commonly implemented techniques for the direct and indirect derivation of black carbon properties, their strengths, limitations, and uncertainties, and provide a non-exhaustive bibliography where the reader can find more detailed information. This review paper is designed as a guide for those wishing to learn about the current state of black carbon measurement instrumentation, how calibration is carried out, when one instrument may have the advantage over another, and where new techniques are needed to fill important knowledge gaps.
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Affiliation(s)
- Daniel A Lack
- NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO, 80305-3337, USA
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111
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Chen B, Andersson A, Lee M, Kirillova EN, Xiao Q, Kruså M, Shi M, Hu K, Lu Z, Streets DG, Du K, Gustafsson Ö. Source forensics of black carbon aerosols from China. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:9102-8. [PMID: 23844635 DOI: 10.1021/es401599r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The limited understanding of black carbon (BC) aerosol emissions from incomplete combustion causes a poorly constrained anthropogenic climate warming that globally may be second only to CO2 and regionally, such as over East Asia, the dominant driver of climate change. The relative contribution to atmospheric BC from fossil fuel versus biomass combustion is important to constrain as fossil BC is a stronger climate forcer. The source apportionment is the underpinning for targeted mitigation actions. However, technology-based "bottom-up" emission inventories are inconclusive, largely due to uncertain BC emission factors from small-scale/household combustion and open burning. We use "top-down" radiocarbon measurements of atmospheric BC from five sites including three city sites and two regional sites to determine that fossil fuel combustion produces 80 ± 6% of the BC emitted from China. This source-diagnostic radiocarbon signal in the ambient aerosol over East Asia establishes a much larger role for fossil fuel combustion than suggested by all 15 BC emission inventory models, including one with monthly resolution. Our results suggest that current climate modeling should refine both BC emission strength and consider the stronger radiative absorption associated with fossil-fuel-derived BC. To mitigate near-term climate effects and improve air quality in East Asia, activities such as residential coal combustion and city traffic should be targeted.
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Affiliation(s)
- Bing Chen
- Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
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112
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Lambe AT, Cappa CD, Massoli P, Onasch TB, Forestieri SD, Martin AT, Cummings MJ, Croasdale DR, Brune WH, Worsnop DR, Davidovits P. Relationship between oxidation level and optical properties of secondary organic aerosol. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:6349-6357. [PMID: 23701291 DOI: 10.1021/es401043j] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Brown carbon (BrC), which may include secondary organic aerosol (SOA), can be a significant climate-forcing agent via its optical absorption properties. However, the overall contribution of SOA to BrC remains poorly understood. Here, correlations between oxidation level and optical properties of SOA are examined. SOA was generated in a flow reactor in the absence of NOx by OH oxidation of gas-phase precursors used as surrogates for anthropogenic (naphthalene, tricyclo[5.2.1.0(2,6)]decane), biomass burning (guaiacol), and biogenic (α-pinene) emissions. SOA chemical composition was characterized with a time-of-flight aerosol mass spectrometer. SOA mass-specific absorption cross sections (MAC) and refractive indices were calculated from real-time cavity ring-down photoacoustic spectrometry measurements at 405 and 532 nm and from UV-vis spectrometry measurements of methanol extracts of filter-collected particles (300 to 600 nm). At 405 nm, SOA MAC values and imaginary refractive indices increased with increasing oxidation level and decreased with increasing wavelength, leading to negligible absorption at 532 nm. Real refractive indices of SOA decreased with increasing oxidation level. Comparison with literature studies suggests that under typical polluted conditions the effect of NOx on SOA absorption is small. SOA may contribute significantly to atmospheric BrC, with the magnitude dependent on both precursor type and oxidation level.
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Affiliation(s)
- Andrew T Lambe
- Chemistry Department, Boston College, Chestnut Hill, Massachusetts, United States.
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113
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Zhang X, Lin YH, Surratt JD, Weber RJ. Sources, composition and absorption Ångström exponent of light-absorbing organic components in aerosol extracts from the Los Angeles Basin. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:3685-93. [PMID: 23506531 DOI: 10.1021/es305047b] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We investigate the sources, chemical composition, and spectral properties of light-absorbing organic aerosol extracts (i.e., brown carbon, or BrC) in the Los Angeles (LA) Basin during the CalNex-2010 field campaign. Light absorption of PM2.5 water-soluble components at 365 nm (Abs365), used as a proxy for water-soluble BrC, was well correlated with water-soluble organic carbon (WSOC) (r(2) = 0.55-0.65), indicating secondary organic aerosol (SOA) formation from anthropogenic emissions was the major source of water-soluble BrC in this region. Normalizing Abs365 to WSOC mass yielded an average solution mass absorption efficiency (MAE365) of 0.71 m(2) g(-1) C. Detailed chemical speciation of filter extracts identified eight nitro-aromatic compounds that were correlated with Abs365. These compounds accounted for ∼4% of the overall water-soluble BrC absorption. Methanol-extracted BrC in LA was approximately 3 and 21 times higher than water-soluble BrC at 365 and 532 nm, respectively, and had a MAE365 of 1.58 m(2) g(-1) C (Abs365 normalized to organic carbon mass). The water-insoluble BrC was strongly correlated with ambient elemental carbon concentration, suggesting similar sources. Absorption Ångström exponent (Å(a)) (fitted between 300 and 600 nm wavelengths) was 3.2 (±1.2) for the PILS water-soluble BrC measurement, compared to 4.8 (±0.5) and 7.6 (±0.5) for methanol- and water-soluble BrC from filter extracts, respectively. These results show that fine particle BrC was prevalent in the LA basin during CalNex, yet many of its properties and potential impacts remain unknown.
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Affiliation(s)
- Xiaolu Zhang
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
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114
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Wechsler AS, Auerbach BJ, Graham TC, Sabiston DC. Distribution of intramyocardial blood flow during pericardial tamponade. Correlation with microscopic anatomy and intrinsic myocardial contractility. J Thorac Cardiovasc Surg 1975. [PMID: 4423787 DOI: 10.1002/2015jd023697-t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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