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Development and Application of HECORA Cloud Retrieval Algorithm Based On the O2-O2 477 nm Absorption Band. REMOTE SENSING 2020. [DOI: 10.3390/rs12183039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this paper, we present the Hefei EMI Cloud Retrieval Algorithm (HECORA), which uses information from the O2-O2 absorption band around 477 nm to retrieve effective cloud fraction and effective cloud pressure from satellite observations. The retrieved cloud information intends to improve the atmospheric trace gas products based on the Environment Monitoring Instrument (EMI) spectrometer. The HECORA method builds on OMCLDO2 and presents some evolutions. The Vector Linearized Discrete Ordinate Radiative Transfer (VLIDORT) model has been used to produce the Top of the Atmosphere (TOA) reflectance Look-up Tables (LUT) as a function of the cloud fraction and cloud pressure. Applying the Differential Optical Absorption Spectroscopy (DOAS) technique to the synthetic reflectance LUT, the reflectance spectra can be associated with O2-O2 geometrical vertical column densities (VCDgeo) and continuum reflectance. This is the core of the retrieval method, since there is a one-to-one relationship between O2-O2 VCDgeo and continuum reflectance, on the one hand, and effective cloud fraction and effective cloud pressure, on the other hand, for a given illumination and observing geometry and given surface height and surface albedo. We first used the VLIDORT synthetic spectra to verify the HECORA algorithm and obtained good results in both the Lambertian cloud model and the scattering cloud model. Secondly, HECORA is applied to OMI and TROPOMI and compared with OMCLDO2, FRESCO+, and OCRA/ROCINN cloud products. Later, the cloud pressure results from TROPOMI observations obtained using HECORA and FRESCO+ are compared with the CALIOP Cloud Layer product. HECORA is closer to the CALIOP results under low cloud conditions, while FRESCO+ is closer to high clouds due to the higher sensitivity of the O2 A-band to cloud vertical information. Finally, HECORA is applied to the TROPOMI NO2 retrieval. Validation of the tropospheric NO2 VCD with ground-based MAX-DOAS measurements shows that choosing HECORA cloud products to correct for photon path variations on the TROPOMI tropospheric NO2 VCD retrievals has better performance than using FRESCO+ under low cloud conditions. In conclusion, this paper shows that the HECORA cloud products are in good agreement with the well-established cloud products and that they are suitable for correcting the effect of cloud in trace gas retrievals. Therefore, HECORA has the potential to be applied to EMI.
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Simulating Multi-Directional Narrowband Reflectance of the Earth’s Surface Using ADAM (A Surface Reflectance Database for ESA’s Earth Observation Missions). REMOTE SENSING 2020. [DOI: 10.3390/rs12101679] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The ADAM (A Surface Reflectance Database for ESA’s Earth Observation Missions) product (a climatological database coupled to its companion calculation toolkit) enables users to simulate realistic hyperspectral and directional global Earth surface reflectances (i.e., top-of-canopy/bottom-of-atmosphere) over the 240–4000 nm spectral range (at 1-nm resolution) and in any illumination/observation geometry, at 0.1° × 0.1° spatial resolution for a typical year. ADAM aims to support the preparation of optical Earth observation missions as well as the design of operational processing chains for the retrieval of atmospheric parameters by characterizing the expected surface reflectance, accounting for its anisotropy. Firstly, we describe (1) the methods used in the development of the gridded monthly ADAM climatologies (over land surfaces: monthly means of normalized reflectances derived from MODIS observations in seven spectral bands for the year 2005; over oceans: monthly means over the 1999–2009 period of chlorophyll content from SeaWiFS and of wind speed from SeaWinds), and (2) the underlying modeling approaches of ADAM toolkit to simulate the spectro-directional variations of the reflectance depending on the assigned surface type. Secondly, we evaluate ADAM simulation performances over land surfaces. A comparison against POLDER multi-spectral/multi-directional measurements for year 2008 shows reliable simulation results with root mean square differences below 0.027 and R2 values above 0.9 for most of the 14 land cover IGBP classes investigated, with no significant bias identified. Only for the “Snow and ice” class is the performance lower pointing to a limitation of climatological data to represent actual snow properties. An evaluation of the modeled reflectance in the specific backscatter direction against CALIPSO data reveals that ADAM tends to overestimate (underestimate) the so-called “hot-spot” by a factor of about 1.5 (1.5 to 2) for barren (vegetated) surfaces.
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NO2 Retrieval from the Environmental Trace Gases Monitoring Instrument (EMI): Preliminary Results and Intercomparison with OMI and TROPOMI. REMOTE SENSING 2019. [DOI: 10.3390/rs11243017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Onboard the Chinese GaoFen-5 (GF5) satellite, the Environmental trace gases Monitoring Instrument (EMI) is a nadir-viewing wide-field spectrometer that was launched on May 9, 2018. EMI measures the back-scattered earthshine solar radiance in the ultraviolet and visible spectral range. By using the differential optical absorption spectrometry (DOAS) method and the EMI measurements in the VIS1 band (405–465 nm), we performed retrievals of NO2. Some first retrieval results of NO2 from EMI and a comparison with OMI and TROPOMI products are presented in this paper. The monthly mean total vertical column densities (VCD) of NO2 show similar spatial distributions to OMI and TROPOMI (r > 0.88) and their difference is less than 27%. A comparison of the daily total VCD shows that EMI could detect the NO2 patterns in good agreement with OMI (r = 0.93) and TROPOMI (r = 0.95). However, the slant column density (SCD) uncertainty (0.79 × 1015 molec cm−2) of the current EMI algorithm is relatively larger than OMI. The daily variation pattern of NO2 from EMI in Beijing in January 2019 is consistent with TROPOMI (r = 0.96). The spatial distribution correlation of the tropospheric NO2 VCD of EMI with OMI and TROPOMI is 0.88 and 0.89, respectively, but shows an overestimate compared to OMI (15%) and TROPOMI (23%), respectively. This study demonstrates the capability of using EMI for global NO2 monitoring.
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Chatzidiakou L, Krause A, Popoola OAM, Di Antonio A, Kellaway M, Han Y, Squires FA, Wang T, Zhang H, Wang Q, Fan Y, Chen S, Hu M, Quint JK, Barratt B, Kelly FJ, Zhu T, Jones RL. Characterising low-cost sensors in highly portable platforms to quantify personal exposure in diverse environments. ATMOSPHERIC MEASUREMENT TECHNIQUES 2019; 12:4643-4657. [PMID: 31534556 PMCID: PMC6751078 DOI: 10.5194/amt-12-1-2019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The inaccurate quantification of personal exposure to air pollution introduces error and bias in health estimations, severely limiting causal inference in epidemiological research worldwide. Rapid advancements in affordable, miniaturised air pollution sensor technologies offer the potential to address this limitation by capturing the high variability of personal exposure during daily life in large-scale studies with unprecedented spatial and temporal resolution. However, concerns remain regarding the suitability of novel sensing technologies for scientific and policy purposes. In this paper we characterise the performance of a portable personal air quality monitor (PAM) that integrates multiple miniaturised sensors for nitrogen oxides (NO x ), carbon monoxide (CO), ozone (O3) and particulate matter (PM) measurements along with temperature, relative humidity, acceleration, noise and GPS sensors. Overall, the air pollution sensors showed high reproducibility (meanR ¯ 2 = 0.93, min-max: 0.80-1.00) and excellent agreement with standard instrumentation (meanR ¯ 2 = 0.82, min-max: 0.54-0.99) in outdoor, indoor and commuting microenvironments across seasons and different geographical settings. An important outcome of this study is that the error of the PAM is significantly smaller than the error introduced when estimating personal exposure based on sparsely distributed outdoor fixed monitoring stations. Hence, novel sensing technologies such as the ones demonstrated here can revolutionise health studies by providing highly resolved reliable exposure metrics at a large scale to investigate the underlying mechanisms of the effects of air pollution on health.
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Affiliation(s)
- Lia Chatzidiakou
- Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Anika Krause
- Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | | | - Andrea Di Antonio
- Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | | | - Yiqun Han
- MRC-PHE Centre for Environment & Health, Imperial College London and King’s College London, London, W2 1PG, UK
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
- Department of Analytical, Environmental and Forensic Sciences, King’s College London, London, SE1 9NH, UK
| | | | - Teng Wang
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
- The Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China
| | - Hanbin Zhang
- MRC-PHE Centre for Environment & Health, Imperial College London and King’s College London, London, W2 1PG, UK
- Department of Analytical, Environmental and Forensic Sciences, King’s College London, London, SE1 9NH, UK
- NIHR Health Protection Research Unit in Health Impact of Environmental Hazards, King’s College London, London, SE1 9NH, UK
| | - Qi Wang
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
- The Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China
| | - Yunfei Fan
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
- The Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China
| | - Shiyi Chen
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
| | - Min Hu
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
- The Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China
| | - Jennifer K. Quint
- National Heart and Lung Institute, Imperial College London, SW3 6LR, UK
| | - Benjamin Barratt
- MRC-PHE Centre for Environment & Health, Imperial College London and King’s College London, London, W2 1PG, UK
- Department of Analytical, Environmental and Forensic Sciences, King’s College London, London, SE1 9NH, UK
- NIHR Health Protection Research Unit in Health Impact of Environmental Hazards, King’s College London, London, SE1 9NH, UK
| | - Frank J. Kelly
- MRC-PHE Centre for Environment & Health, Imperial College London and King’s College London, London, W2 1PG, UK
- Department of Analytical, Environmental and Forensic Sciences, King’s College London, London, SE1 9NH, UK
- NIHR Health Protection Research Unit in Health Impact of Environmental Hazards, King’s College London, London, SE1 9NH, UK
| | - Tong Zhu
- College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
- The Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China
| | - Roderic L. Jones
- Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
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Oelker J, Richter A, Dinter T, Rozanov VV, Burrows JP, Bracher A. Global diffuse attenuation derived from vibrational Raman scattering detected in hyperspectral backscattered satellite spectra. OPTICS EXPRESS 2019; 27:A829-A855. [PMID: 31252858 DOI: 10.1364/oe.27.00a829] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 03/17/2019] [Indexed: 06/09/2023]
Abstract
Underwater light field characterization is of importance for understanding biogeochemical processes and heat budget of the global oceans, which are impacting and reacting to climate change. Vibrational Raman Scattering (VRS) was retrieved from backscattered radiances measured by three different hyperspectral satellite sensors, SCIAMACHY, GOME-2, and OMI, using Differential Optical Absorption Spectroscopy (DOAS). Diffuse attenuation coefficient (Kd) in the blue spectral range (390 to 426 nm) was derived from the VRS signal via a look-up-table established through ocean-atmosphere coupled radiative transfer modeling. We processed one year of data, representative of the overlapping period of optimal operation for all three sensors. Resulting data sets were evaluated by comparison with Kd at 490 nm from Ocean Colour Climate Change Initiative (OC-CCI) which was first converted to Kd at 390 to 426 nm. Good agreement with the OC-CCI Kd product was achieved for all three sensors when Kd was limited to below 0.15 m-1. Differences among the hyperspectral sensors and to OC-CCI were attributed to particular instrumental effects on the DOAS retrieval leading to temporal and spatial biases. This is in addition to the fact that the spatial and temporal resolution of the hyperspectral sensors data differ among themselves and are much lower then for the OC-CCI Kd-product. Further corrections (e.g., empirical) are necessary before these data sets can be merged in order to obtain a long-term Kd product for the blue spectral range.
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Validation of OMI HCHO Products Using MAX-DOAS observations from 2010 to 2016 in Xianghe, Beijing: Investigation of the Effects of Aerosols on Satellite Products. REMOTE SENSING 2019. [DOI: 10.3390/rs11020203] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Formaldehyde (HCHO) is one of the most abundant hydrocarbons in the atmosphere. Its absorption features in the 320–360 nm range allow its concentration in the atmosphere to be retrieved from space. There are two versions of HCHO datasets derived from the Ozone Monitoring Instrument (OMI)—one provided by the Royal Belgian Institute for Space Aeronomy (BIRA-IASB) and one provided by the National Aeronautics and Space Administration (NASA)—referred to as OMI-BIRA and OMI-NASA, respectively. We conducted daily comparisons of OMI-BIRA and multi-axis differential optical absorption spectrometry (MAX-DOAS), OMI-NASA and MAX-DOAS, and OMI-BIRA and OMI-NASA and monthly comparisons of OMI-BIRA and MAX-DOAS and OMI-NASA and MAX-DOAS. Daily comparisons showed a strong impact of effective cloud fraction (eCF), and correlations were better for eCF < 0.1 than for eCF < 0.3. By contrast, the monthly and multi-year monthly mean values yielded correlations of R2 = 0.60 and R2 = 0.95, respectively, for OMI-BIRA and MAX-DOAS, and R2 = 0.45 and R2 = 0.78 for OMI-NASA and MAX-DOAS, respectively. Therefore, use of the monthly mean HCHO datasets is strongly recommended. We conducted a sensitivity test for HCHO air mass factor (AMF) calculations with respect to the HCHO profile, the aerosol extinction coefficient (AEC), the HCHO profile–AEC combination, the aerosol optical depth (AOD), and the single scattering albedo (SSA) to explicitly account for the aerosol optical effects on the HCHO AMF. We found that the combination of AEC and HCHO profiles can account for 23–39% of the HCHO AMF variation. Furthermore, a high load of absorptive aerosols can exert a considerable effect (−53%) on the AMF. Finally, we used the HCHO monthly mean profiles from Goddard Earth Observing System coupled to Chemistry (GEOS-Chem), seasonal mean AECs from Cloud-Aerosol LIDAR with Orthogonal Polarization (CALIOP) and monthly climatologies of AOD and SSA from the OMAERUV (OMI level-2 near UV aerosol data product) dataset at Xianghe station to determine the aerosol correction. The results reveal that aerosols can account for +6.37% to +20.7% of the HCHO monthly change. However, the changes are greatest in winter and are weaker in summer and autumn, indicating that the aerosol correction is more applicable under high-AAOD conditions and that there may be other reasons for the significant underestimation between satellite and MAX-DOAS observations.
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Zoogman P, Liu X, Suleiman RM, Pennington WF, Flittner DE, Al-Saadi JA, Hilton BB, Nicks DK, Newchurch MJ, Carr JL, Janz SJ, Andraschko MR, Arola A, Baker BD, Canova BP, Chan Miller C, Cohen RC, Davis JE, Dussault ME, Edwards DP, Fishman J, Ghulam A, González Abad G, Grutter M, Herman JR, Houck J, Jacob DJ, Joiner J, Kerridge BJ, Kim J, Krotkov NA, Lamsal L, Li C, Lindfors A, Martin RV, McElroy CT, McLinden C, Natraj V, Neil DO, Nowlan CR, O'Sullivan EJ, Palmer PI, Pierce RB, Pippin MR, Saiz-Lopez A, Spurr RJD, Szykman JJ, Torres O, Veefkind JP, Veihelmann B, Wang H, Wang J, Chance K. Tropospheric Emissions: Monitoring of Pollution (TEMPO). JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2017; 186:17-39. [PMID: 32817995 PMCID: PMC7430511 DOI: 10.1016/j.jqsrt.2016.05.008] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
TEMPO was selected in 2012 by NASA as the first Earth Venture Instrument, for launch between 2018 and 2021. It will measure atmospheric pollution for greater North America from space using ultraviolet and visible spectroscopy. TEMPO observes from Mexico City, Cuba, and the Bahamas to the Canadian oil sands, and from the Atlantic to the Pacific, hourly and at high spatial resolution (~2.1 km N/S×4.4 km E/W at 36.5°N, 100°W). TEMPO provides a tropospheric measurement suite that includes the key elements of tropospheric air pollution chemistry, as well as contributing to carbon cycle knowledge. Measurements are made hourly from geostationary (GEO) orbit, to capture the high variability present in the diurnal cycle of emissions and chemistry that are unobservable from current low-Earth orbit (LEO) satellites that measure once per day. The small product spatial footprint resolves pollution sources at sub-urban scale. Together, this temporal and spatial resolution improves emission inventories, monitors population exposure, and enables effective emission-control strategies. TEMPO takes advantage of a commercial GEO host spacecraft to provide a modest cost mission that measures the spectra required to retrieve ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2), formaldehyde (H2CO), glyoxal (C2H2O2), bromine monoxide (BrO), IO (iodine monoxide),water vapor, aerosols, cloud parameters, ultraviolet radiation, and foliage properties. TEMPO thus measures the major elements, directly or by proxy, in the tropospheric O3 chemistry cycle. Multi-spectral observations provide sensitivity to O3 in the lowermost troposphere, substantially reducing uncertainty in air quality predictions. TEMPO quantifies and tracks the evolution of aerosol loading. It provides these near-real-time air quality products that will be made publicly available. TEMPO will launch at a prime time to be the North American component of the global geostationary constellation of pollution monitoring together with the European Sentinel-4 (S4) and Korean Geostationary Environment Monitoring Spectrometer (GEMS) instruments.
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Affiliation(s)
- P Zoogman
- Harvard-Smithsonian Center for Astrophysics
| | - X Liu
- Harvard-Smithsonian Center for Astrophysics
| | | | | | | | | | | | | | | | | | - S J Janz
- NASA Goddard Space Flight Center
| | | | - A Arola
- Finnish Meteorological Institute
| | | | | | | | - R C Cohen
- University of California at Berkeley
| | - J E Davis
- Harvard-Smithsonian Center for Astrophysics
| | | | | | | | | | | | - M Grutter
- Universidad Nacional Autónoma de México
| | - J R Herman
- University of Maryland, Baltimore County
| | - J Houck
- Harvard-Smithsonian Center for Astrophysics
| | | | - J Joiner
- NASA Goddard Space Flight Center
| | | | | | | | - L Lamsal
- NASA Goddard Space Flight Center
- GESTAR, University Space Research Association
| | - C Li
- NASA Goddard Space Flight Center
- University of Maryland, Baltimore County
| | | | - R V Martin
- Harvard-Smithsonian Center for Astrophysics
- Dalhousie University
| | | | | | | | | | - C R Nowlan
- Harvard-Smithsonian Center for Astrophysics
| | | | | | - R B Pierce
- National Oceanic and Atmospheric Administration
| | | | - A Saiz-Lopez
- Instituto de Química Física Rocasolano, CSIC, Spain
| | | | | | - O Torres
- NASA Goddard Space Flight Center
| | | | | | - H Wang
- Harvard-Smithsonian Center for Astrophysics
| | | | - K Chance
- Harvard-Smithsonian Center for Astrophysics
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Park SS, Kim J, Lee H, Torres O, Lee KM, Lee SD. Utilization of O 4 slant column density to derive aerosol layer height from a spaceborne UV-Visible hyperspectral sensor: Sensitivity and case study. ATMOSPHERIC CHEMISTRY AND PHYSICS 2016; 16:1987-2006. [PMID: 32742281 PMCID: PMC7394340 DOI: 10.5194/acp-16-1987-2016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The sensitivities of oxygen-dimer (O4) slant column densities (SCDs) to changes in aerosol layer height are investigated using the simulated radiances by a radiative transfer model, the Linearlized pseudo-spherical vector discrete ordinate radiative transfer (VLIDORT), and the Differential Optical Absorption Spectroscopy (DOAS) technique. The sensitivities of the O4 index (O4I), which is defined as dividing O4 SCD by 1040 molecules2cm-5, to aerosol types and optical properties are also evaluated and compared. Among the O4 absorption bands at 340, 360, 380, and 477 nm, the O4 absorption band at 477 nm is found to be the most suitable to retrieve the aerosol effective height. However, the O4I at 477 nm is significantly influenced not only by the aerosol layer effective height but also by aerosol vertical profiles, optical properties including single scattering albedo (SSA), aerosol optical depth (AOD), particle size, and surface albedo. Overall, the error of the retrieved aerosol effective height is estimated to be 1276, 846, and 739 m for dust, non-absorbing, and absorbing aerosol, respectively, assuming knowledge on the aerosol vertical distribution shape. Using radiance data from the Ozone Monitoring Instrument (OMI), a new algorithm is developed to derive the aerosol effective height over East Asia after the determination of the aerosol type and AOD from the MODerate resolution Imaging Spectroradiometer (MODIS). About 80% of retrieved aerosol effective heights are within the error range of 1 km compared to those obtained from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) measurements on thick aerosol layer cases.
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Affiliation(s)
- Sang Seo Park
- Department of Atmospheric Sciences, Yonsei University, Seoul, Korea
| | - Jhoon Kim
- Department of Atmospheric Sciences, Yonsei University, Seoul, Korea
| | - Hanlim Lee
- Department of Atmospheric Sciences, Yonsei University, Seoul, Korea
- Department of Spatial Information Engineering, Pukyong National University, Busan, Korea
| | - Omar Torres
- NASA Goddard Space Flight Center, Greenbelt, Maryland, United States
| | - Kwang-Mog Lee
- Department of Astronomy and Atmospheric Science, Kyungpook National University, Daegu, Korea
| | - Sang Deok Lee
- National Institute of Environment Research, Ministry of Environment, Incheon, Korea
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Marchenko S, Krotkov NA, Lamsal LN, Celarier EA, Swartz WH, Bucsela EJ. Revising the slant column density retrieval of nitrogen dioxide observed by the Ozone Monitoring Instrument. JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES : JGR 2015; 120:5670-5692. [PMID: 27708989 PMCID: PMC5034499 DOI: 10.1002/2014jd022913] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 04/30/2015] [Accepted: 05/02/2015] [Indexed: 05/04/2023]
Abstract
Nitrogen dioxide retrievals from the Aura/Ozone Monitoring Instrument (OMI) have been used extensively over the past decade, particularly in the study of tropospheric air quality. Recent comparisons of OMI NO2 with independent data sets and models suggested that the OMI values of slant column density (SCD) and stratospheric vertical column density (VCD) in both the NASA OMNO2 and Royal Netherlands Meteorological Institute DOMINO products are too large, by around 10-40%. We describe a substantially revised spectral fitting algorithm, optimized for the OMI visible light spectrometer channel. The most important changes comprise a flexible adjustment of the instrumental wavelength shifts combined with iterative removal of the ring spectral features; the multistep removal of instrumental noise; iterative, sequential estimates of SCDs of the trace gases in the 402-465 nm range. These changes reduce OMI SCD(NO2) by 10-35%, bringing them much closer to SCDs retrieved from independent measurements and models. The revised SCDs, submitted to the stratosphere-troposphere separation algorithm, give tropospheric VCDs ∼10-15% smaller in polluted regions, and up to ∼30% smaller in unpolluted areas. Although the revised algorithm has been optimized specifically for the OMI NO2 retrieval, our approach could be more broadly applicable.
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Affiliation(s)
- S. Marchenko
- Science Systems and Applications, Inc.LanhamMarylandUSA
- NASA Goddard Space Flight CenterGreenbeltMarylandUSA
| | - N. A. Krotkov
- NASA Goddard Space Flight CenterGreenbeltMarylandUSA
| | - L. N. Lamsal
- NASA Goddard Space Flight CenterGreenbeltMarylandUSA
- Universities Space Research AssociationColumbiaMarylandUSA
| | - E. A. Celarier
- NASA Goddard Space Flight CenterGreenbeltMarylandUSA
- Universities Space Research AssociationColumbiaMarylandUSA
| | - W. H. Swartz
- NASA Goddard Space Flight CenterGreenbeltMarylandUSA
- Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
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Misra A, Meadows V, Claire M, Crisp D. Using dimers to measure biosignatures and atmospheric pressure for terrestrial exoplanets. ASTROBIOLOGY 2014; 14:67-86. [PMID: 24432758 PMCID: PMC3928785 DOI: 10.1089/ast.2013.0990] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We present a new method to probe atmospheric pressure on Earth-like planets using (O2-O2) dimers in the near-infrared. We also show that dimer features could be the most readily detectable biosignatures for Earth-like atmospheres and may even be detectable in transit transmission with the James Webb Space Telescope (JWST). The absorption by dimers changes more rapidly with pressure and density than that of monomers and can therefore provide additional information about atmospheric pressures. By comparing the absorption strengths of rotational and vibrational features to the absorption strengths of dimer features, we show that in some cases it may be possible to estimate the pressure at the reflecting surface of a planet. This method is demonstrated by using the O2 A band and the 1.06 μm dimer feature, either in transmission or reflected spectra. It works best for planets around M dwarfs with atmospheric pressures between 0.1 and 10 bar and for O2 volume mixing ratios above 50% of Earth's present-day level. Furthermore, unlike observations of Rayleigh scattering, this method can be used at wavelengths longer than 0.6 μm and is therefore potentially applicable, although challenging, to near-term planet characterization missions such as JWST. We also performed detectability studies for JWST transit transmission spectroscopy and found that the 1.06 and 1.27 μm dimer features could be detectable (SNR>3) for an Earth analogue orbiting an M5V star at a distance of 5 pc. The detection of these features could provide a constraint on the atmospheric pressure of an exoplanet and serve as biosignatures for oxygenic photosynthesis. We calculated the required signal-to-noise ratios to detect and characterize O2 monomer and dimer features in direct imaging-reflected spectra and found that signal-to-noise ratios greater than 10 at a spectral resolving power of R=100 would be required.
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Affiliation(s)
- Amit Misra
- University of Washington Astronomy Department, Seattle, Washington, USA
- NAI Virtual Planetary Laboratory, Seattle, Washington, USA
- University of Washington Astrobiology Program, Seattle, Washington, USA
| | - Victoria Meadows
- University of Washington Astronomy Department, Seattle, Washington, USA
- NAI Virtual Planetary Laboratory, Seattle, Washington, USA
- University of Washington Astrobiology Program, Seattle, Washington, USA
| | - Mark Claire
- NAI Virtual Planetary Laboratory, Seattle, Washington, USA
- Department of Earth and Environmental Sciences, University of St Andrews, Fife, Scotland
- Blue Marble Space Institute of Science, Seattle, Washington, USA
| | - Dave Crisp
- NAI Virtual Planetary Laboratory, Seattle, Washington, USA
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
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Mijling B, van der A RJ. Using daily satellite observations to estimate emissions of short-lived air pollutants on a mesoscopic scale. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012jd017817] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Barkley MP, Kurosu TP, Chance K, De Smedt I, Van Roozendael M, Arneth A, Hagberg D, Guenther A. Assessing sources of uncertainty in formaldehyde air mass factors over tropical South America: Implications for top-down isoprene emission estimates. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd016827] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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The Impact of Subscale Inhomogeneity on Oxygen A Band Cloud-Top Pressure Estimates: Using ESA’s MERIS as a Proxy for DSCOVR-EPIC. REMOTE SENSING 2012. [DOI: 10.3390/rs4071963] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Prasad AK, Singh RP, Kafatos M. Influence of coal-based thermal power plants on the spatial-temporal variability of tropospheric NO2 column over India. ENVIRONMENTAL MONITORING AND ASSESSMENT 2012; 184:1891-1907. [PMID: 21573858 DOI: 10.1007/s10661-011-2087-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Accepted: 04/14/2011] [Indexed: 05/30/2023]
Abstract
The oxides of nitrogen--NO(x) (NO and NO(2))--are an important constituent of the troposphere. The availability of relatively higher spatial (0.25° grid) and temporal (daily) resolution data from ozone monitoring instrument (OMI) onboard Aura helps us to better differentiate between the point sources such as thermal power plants from large cities and rural areas compared to previous sensors. The annual and seasonal (summer and winter) distributions shows very high mean tropospheric NO(2) in specific pockets over India especially over the Indo-Gangetic plains (up to 14.2 × 10(15) molecules/cm(2)). These pockets correspond with the known locations of major thermal power plants. The tropospheric NO(2) over India show a large seasonal variability that is also observed in the ground NO(2) data. The multiple regression analysis show that the influence of a unit of power plant (in gigawatts) over tropospheric NO(2) (×10(15) molecules/cm(2)) is around ten times compared to a unit of population (in millions) over India. The OMI data show that the NO(2) increases by 0.794 ± 0.12 (×10(15) molecules/cm(2); annual) per GW compared to a previous estimate of 0.014 (×10(15) molecules/cm(2)) over India. The increase of tropospheric NO(2) per gigawatt is found to be 1.088 ± 0.18, 0.898 ± 0.14, and 0.395 ± 0.13 (×10(15) molecules/cm(2)) during winter, summer, and monsoon seasons, respectively. The strong seasonal variation is attributed to the enhancement or suppression of NO(2) due to various controlling factors which is discussed here. The recent increasing trend (2005-2007) over rural thermal power plants pockets like Agori and Korba is due to recent large capacity additions in these regions.
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Affiliation(s)
- Anup K Prasad
- School of Earth and Environmental Sciences, Schmid College of Science, Chapman University, Orange, CA 92866, USA.
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O'Byrne G, Martin RV, van Donkelaar A, Joiner J, Celarier EA. Surface reflectivity from the Ozone Monitoring Instrument using the Moderate Resolution Imaging Spectroradiometer to eliminate clouds: Effects of snow on ultraviolet and visible trace gas retrievals. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd013079] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yang Q, Cunnold DM, Choi Y, Wang Y, Nam J, Wang HJ, Froidevaux L, Thompson AM, Bhartia PK. A study of tropospheric ozone column enhancements over North America using satellite data and a global chemical transport model. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd012616] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lamsal LN, Martin RV, van Donkelaar A, Celarier EA, Bucsela EJ, Boersma KF, Dirksen R, Luo C, Wang Y. Indirect validation of tropospheric nitrogen dioxide retrieved from the OMI satellite instrument: Insight into the seasonal variation of nitrogen oxides at northern midlatitudes. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd013351] [Citation(s) in RCA: 183] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hains JC, Boersma KF, Kroon M, Dirksen RJ, Cohen RC, Perring AE, Bucsela E, Volten H, Swart DPJ, Richter A, Wittrock F, Schoenhardt A, Wagner T, Ibrahim OW, van Roozendael M, Pinardi G, Gleason JF, Veefkind JP, Levelt P. Testing and improving OMI DOMINO tropospheric NO2using observations from the DANDELIONS and INTEX-B validation campaigns. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd012399] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Pittman JV, Pan LL, Wei JC, Irion FW, Liu X, Maddy ES, Barnet CD, Chance K, Gao RS. Evaluation of AIRS, IASI, and OMI ozone profile retrievals in the extratropical tropopause region using in situ aircraft measurements. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009jd012493] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dirksen RJ, Folkert Boersma K, de Laat J, Stammes P, van der Werf GR, Val Martin M, Kelder HM. An aerosol boomerang: Rapid around-the-world transport of smoke from the December 2006 Australian forest fires observed from space. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009jd012360] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wang P, Knap WH, Kuipers Munneke P, Stammes P. Clear-sky shortwave radiative closure for the Cabauw Baseline Surface Radiation Network site, Netherlands. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2009jd011978] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Curier RL, Veefkind JP, Braak R, Veihelmann B, Torres O, de Leeuw G. Retrieval of aerosol optical properties from OMI radiances using a multiwavelength algorithm: Application to western Europe. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008738] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Lamsal LN, Martin RV, van Donkelaar A, Steinbacher M, Celarier EA, Bucsela E, Dunlea EJ, Pinto JP. Ground-level nitrogen dioxide concentrations inferred from the satellite-borne Ozone Monitoring Instrument. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009235] [Citation(s) in RCA: 247] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Brinksma EJ, Pinardi G, Volten H, Braak R, Richter A, Schönhardt A, van Roozendael M, Fayt C, Hermans C, Dirksen RJ, Vlemmix T, Berkhout AJC, Swart DPJ, Oetjen H, Wittrock F, Wagner T, Ibrahim OW, de Leeuw G, Moerman M, Curier RL, Celarier EA, Cede A, Knap WH, Veefkind JP, Eskes HJ, Allaart M, Rothe R, Piters AJM, Levelt PF. The 2005 and 2006 DANDELIONS NO2and aerosol intercomparison campaigns. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008808] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wenig MO, Cede AM, Bucsela EJ, Celarier EA, Boersma KF, Veefkind JP, Brinksma EJ, Gleason JF, Herman JR. Validation of OMI tropospheric NO2column densities using direct-Sun mode Brewer measurements at NASA Goddard Space Flight Center. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008988] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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van Deelen R, Hasekamp OP, van Diedenhoven B, Landgraf J. Retrieval of cloud properties from near-ultraviolet, visible, and near-infrared satellite-based Earth reflectivity spectra: A comparative study. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009129] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kramer LJ, Leigh RJ, Remedios JJ, Monks PS. Comparison of OMI and ground-based in situ and MAX-DOAS measurements of tropospheric nitrogen dioxide in an urban area. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd009168] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Stammes P, Sneep M, de Haan JF, Veefkind JP, Wang P, Levelt PF. Effective cloud fractions from the Ozone Monitoring Instrument: Theoretical framework and validation. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008820] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bucsela EJ, Perring AE, Cohen RC, Boersma KF, Celarier EA, Gleason JF, Wenig MO, Bertram TH, Wooldridge PJ, Dirksen R, Veefkind JP. Comparison of tropospheric NO2from in situ aircraft measurements with near-real-time and standard product data from OMI. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008838] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Boersma KF, Jacob DJ, Eskes HJ, Pinder RW, Wang J, van der A RJ. Intercomparison of SCIAMACHY and OMI tropospheric NO2columns: Observing the diurnal evolution of chemistry and emissions from space. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008816] [Citation(s) in RCA: 143] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Sneep M, de Haan JF, Stammes P, Wang P, Vanbauce C, Joiner J, Vasilkov AP, Levelt PF. Three-way comparison between OMI and PARASOL cloud pressure products. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008694] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Vasilkov A, Joiner J, Spurr R, Bhartia PK, Levelt P, Stephens G. Evaluation of the OMI cloud pressures derived from rotational Raman scattering by comparisons with other satellite data and radiative transfer simulations. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008689] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Millet DB, Jacob DJ, Boersma KF, Fu TM, Kurosu TP, Chance K, Heald CL, Guenther A. Spatial distribution of isoprene emissions from North America derived from formaldehyde column measurements by the OMI satellite sensor. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008950] [Citation(s) in RCA: 204] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Torres O, Tanskanen A, Veihelmann B, Ahn C, Braak R, Bhartia PK, Veefkind P, Levelt P. Aerosols and surface UV products from Ozone Monitoring Instrument observations: An overview. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2007jd008809] [Citation(s) in RCA: 590] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yang K, Krotkov NA, Krueger AJ, Carn SA, Bhartia PK, Levelt PF. Retrieval of large volcanic SO2columns from the Aura Ozone Monitoring Instrument: Comparison and limitations. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2007jd008825] [Citation(s) in RCA: 161] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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