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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ftdoajarticles:oai:doaj.org/article:fabf4cd21c8c43bfbb390447d5f7653b 2023-05-15T13:06:47+02:00 Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem L. Zhang D. K. Henze G. A. Grell G. R. Carmichael N. Bousserez Q. Zhang O. Torres C. Ahn Z. Lu J. Cao Y. Mao 2015-09-01T00:00:00Z https://doi.org/10.5194/acp-15-10281-2015 https://doaj.org/article/fabf4cd21c8c43bfbb390447d5f7653b EN eng Copernicus Publications http://www.atmos-chem-phys.net/15/10281/2015/acp-15-10281-2015.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-15-10281-2015 https://doaj.org/article/fabf4cd21c8c43bfbb390447d5f7653b Atmospheric Chemistry and Physics, Vol 15, Iss 18, Pp 10281-10308 (2015) Physics QC1-999 Chemistry QD1-999 article 2015 ftdoajarticles https://doi.org/10.5194/acp-15-10281-2015 2022-12-31T14:27:06Z 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 ... Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Indian Atmospheric Chemistry and Physics 15 18 10281 10308 |
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Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 L. Zhang D. K. Henze G. A. Grell G. R. Carmichael N. Bousserez Q. Zhang O. Torres C. Ahn Z. Lu J. Cao Y. Mao Constraining black carbon aerosol over Asia using OMI aerosol absorption optical depth and the adjoint of GEOS-Chem |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
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 ... |
format |
Article in Journal/Newspaper |
author |
L. Zhang D. K. Henze G. A. Grell G. R. Carmichael N. Bousserez Q. Zhang O. Torres C. Ahn Z. Lu J. Cao Y. Mao |
author_facet |
L. Zhang D. K. Henze G. A. Grell G. R. Carmichael N. Bousserez Q. Zhang O. Torres C. Ahn Z. Lu J. Cao Y. Mao |
author_sort |
L. Zhang |
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://doaj.org/article/fabf4cd21c8c43bfbb390447d5f7653b |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Chemistry and Physics, Vol 15, Iss 18, Pp 10281-10308 (2015) |
op_relation |
http://www.atmos-chem-phys.net/15/10281/2015/acp-15-10281-2015.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-15-10281-2015 https://doaj.org/article/fabf4cd21c8c43bfbb390447d5f7653b |
op_doi |
https://doi.org/10.5194/acp-15-10281-2015 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
15 |
container_issue |
18 |
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10281 |
op_container_end_page |
10308 |
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1766020403321372672 |