Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem
Accurate estimates of the emissions and distribution of black carbon (BC) in the region referred to here as Southeastern Asia (70–150° E, 11° S–55° N) are critical to studies of the atmospheric environment and climate change. Analysis of modeled BC concentrations compared to in situ observations ind...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00044166 2023-05-15T13:07:09+02:00 Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem Zhang, L. Henze, D. K. Grell, G. A. Carmichael, G. R. Bousserez, N. Zhang, Q. Torres, O. Ahn, C. Lu, Z. Cao, J. Mao, Y. 2015-09 electronic https://doi.org/10.5194/acp-15-10281-2015 https://noa.gwlb.de/receive/cop_mods_00044166 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00043786/acp-15-10281-2015.pdf https://acp.copernicus.org/articles/15/10281/2015/acp-15-10281-2015.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-15-10281-2015 https://noa.gwlb.de/receive/cop_mods_00044166 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00043786/acp-15-10281-2015.pdf https://acp.copernicus.org/articles/15/10281/2015/acp-15-10281-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/acp-15-10281-2015 2022-02-08T22:40:13Z Accurate estimates of the emissions and distribution of black carbon (BC) in the region referred to here as Southeastern Asia (70–150° E, 11° S–55° N) are critical to studies of the atmospheric environment and climate change. Analysis of modeled BC concentrations compared to in situ observations indicates levels are underestimated over most of Southeast Asia when using any of four different emission inventories. We thus attempt to reduce uncertainties in BC emissions and improve BC model simulations by developing top-down, spatially resolved, estimates of BC emissions through assimilation of OMI (Ozone Monitoring Instrument) observations of aerosol absorption optical depth (AAOD) with the GEOS-Chem (Goddard Earth Observing System – chemistry) model and its adjoint for April and October 2006. Overwhelming enhancements, up to 500 %, in anthropogenic BC emissions are shown after optimization over broad areas of Southeast Asia in April. In October, the optimization of anthropogenic emissions yields a slight reduction (1–5 %) over India and parts of southern China, while emissions increase by 10–50 % over eastern China. Observational data from in situ measurements and AERONET (Aerosol Robotic Network) observations are used to evaluate the BC inversions and assess the bias between OMI and AERONET AAOD. Low biases in BC concentrations are improved or corrected in most eastern and central sites over China after optimization, while the constrained model still underestimates concentrations in Indian sites in both April and October, possibly as a consequence of low prior emissions. Model resolution errors may contribute up to a factor of 2.5 to the underestimation of surface BC concentrations over northern India. We also compare the optimized results using different anthropogenic emission inventories and discuss the sensitivity of top-down constraints on anthropogenic emissions with respect to biomass burning emissions. In addition, the impacts of brown carbon, the formulation of the observation operator, and different a priori constraints on the optimization are investigated. Overall, despite these limitations and uncertainties, using OMI AAOD to constrain BC sources improves model representation of BC distributions, particularly over China. Article in Journal/Newspaper Aerosol Robotic Network Niedersächsisches Online-Archiv NOA Indian Atmospheric Chemistry and Physics 15 18 10281 10308 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Zhang, L. Henze, D. K. Grell, G. A. Carmichael, G. R. Bousserez, N. Zhang, Q. Torres, O. Ahn, C. Lu, Z. Cao, J. Mao, Y. Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem |
topic_facet |
article Verlagsveröffentlichung |
description |
Accurate estimates of the emissions and distribution of black carbon (BC) in the region referred to here as Southeastern Asia (70–150° E, 11° S–55° N) are critical to studies of the atmospheric environment and climate change. Analysis of modeled BC concentrations compared to in situ observations indicates levels are underestimated over most of Southeast Asia when using any of four different emission inventories. We thus attempt to reduce uncertainties in BC emissions and improve BC model simulations by developing top-down, spatially resolved, estimates of BC emissions through assimilation of OMI (Ozone Monitoring Instrument) observations of aerosol absorption optical depth (AAOD) with the GEOS-Chem (Goddard Earth Observing System – chemistry) model and its adjoint for April and October 2006. Overwhelming enhancements, up to 500 %, in anthropogenic BC emissions are shown after optimization over broad areas of Southeast Asia in April. In October, the optimization of anthropogenic emissions yields a slight reduction (1–5 %) over India and parts of southern China, while emissions increase by 10–50 % over eastern China. Observational data from in situ measurements and AERONET (Aerosol Robotic Network) observations are used to evaluate the BC inversions and assess the bias between OMI and AERONET AAOD. Low biases in BC concentrations are improved or corrected in most eastern and central sites over China after optimization, while the constrained model still underestimates concentrations in Indian sites in both April and October, possibly as a consequence of low prior emissions. Model resolution errors may contribute up to a factor of 2.5 to the underestimation of surface BC concentrations over northern India. We also compare the optimized results using different anthropogenic emission inventories and discuss the sensitivity of top-down constraints on anthropogenic emissions with respect to biomass burning emissions. In addition, the impacts of brown carbon, the formulation of the observation operator, and different a priori constraints on the optimization are investigated. Overall, despite these limitations and uncertainties, using OMI AAOD to constrain BC sources improves model representation of BC distributions, particularly over China. |
format |
Article in Journal/Newspaper |
author |
Zhang, L. Henze, D. K. Grell, G. A. Carmichael, G. R. Bousserez, N. Zhang, Q. Torres, O. Ahn, C. Lu, Z. Cao, J. Mao, Y. |
author_facet |
Zhang, L. Henze, D. K. Grell, G. A. Carmichael, G. R. Bousserez, N. Zhang, Q. Torres, O. Ahn, C. Lu, Z. Cao, J. Mao, Y. |
author_sort |
Zhang, L. |
title |
Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem |
title_short |
Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem |
title_full |
Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem |
title_fullStr |
Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem |
title_full_unstemmed |
Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem |
title_sort |
constraining black carbon aerosol over asia using omi aerosol absorption optical depth and the adjoint of geos-chem |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/acp-15-10281-2015 https://noa.gwlb.de/receive/cop_mods_00044166 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00043786/acp-15-10281-2015.pdf https://acp.copernicus.org/articles/15/10281/2015/acp-15-10281-2015.pdf |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-15-10281-2015 https://noa.gwlb.de/receive/cop_mods_00044166 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00043786/acp-15-10281-2015.pdf https://acp.copernicus.org/articles/15/10281/2015/acp-15-10281-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-15-10281-2015 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
15 |
container_issue |
18 |
container_start_page |
10281 |
op_container_end_page |
10308 |
_version_ |
1766037915854438400 |