Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport
In May 2003, both MODIS aerosol optical depth (AOD) and carbon monoxide (CO) measurements from MOPITT show significant trans-Pacific transport to North America. We apply the global chemical transport model, GEOS-Chem, to analyze the main features of the long-range transport events. Enhancements of M...
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ftdoajarticles:oai:doaj.org/article:9fafc761f6d944ed8cf78843a48d20e5 2023-05-15T13:15:03+02:00 Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport J. Nam Y. Wang C. Luo D. A. Chu 2010-04-01T00:00:00Z https://doi.org/10.5194/acp-10-3297-2010 https://doaj.org/article/9fafc761f6d944ed8cf78843a48d20e5 EN eng Copernicus Publications http://www.atmos-chem-phys.net/10/3297/2010/acp-10-3297-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-10-3297-2010 1680-7316 1680-7324 https://doaj.org/article/9fafc761f6d944ed8cf78843a48d20e5 Atmospheric Chemistry and Physics, Vol 10, Iss 7, Pp 3297-3308 (2010) Physics QC1-999 Chemistry QD1-999 article 2010 ftdoajarticles https://doi.org/10.5194/acp-10-3297-2010 2022-12-31T05:00:58Z In May 2003, both MODIS aerosol optical depth (AOD) and carbon monoxide (CO) measurements from MOPITT show significant trans-Pacific transport to North America. We apply the global chemical transport model, GEOS-Chem, to analyze the main features of the long-range transport events. Enhancements of MOPITT CO over the tropical Pacific are much broader than MODIS AOD enhancements. We find in model simulations that a major fraction of the CO enhancements in the subtropics in May is due to biomass burning in Southeast Asia in April. Biomass burning CO was recirculated into the subtropical high-pressure system and lingered for a much longer period than aerosols transported at higher latitudes. Simulated AOD enhancements are due to a combination of dust, sulfate, and organic and elemental carbons. Dust contribution dominates the AOD enhancements in early May. Model results indicate that dust transport takes place at higher altitude than the other aerosols. MODIS observations indicate a bias in model simulated pathway of dust transport in one out of the three cases analyzed. Sensitivities of dust transport pathways are analyzed in the model. The dipole structure of transport, consisting of the Aleutian Low to the north and the Pacific High to the south, over the Pacific is found to be a key factor. The placement of the dipole structure relative to model parameters such as up-stream wind field and source location may lead to the high sensitivity of simulated transport pathways. Article in Journal/Newspaper aleutian low Directory of Open Access Journals: DOAJ Articles Pacific Atmospheric Chemistry and Physics 10 7 3297 3308 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 J. Nam Y. Wang C. Luo D. A. Chu Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
In May 2003, both MODIS aerosol optical depth (AOD) and carbon monoxide (CO) measurements from MOPITT show significant trans-Pacific transport to North America. We apply the global chemical transport model, GEOS-Chem, to analyze the main features of the long-range transport events. Enhancements of MOPITT CO over the tropical Pacific are much broader than MODIS AOD enhancements. We find in model simulations that a major fraction of the CO enhancements in the subtropics in May is due to biomass burning in Southeast Asia in April. Biomass burning CO was recirculated into the subtropical high-pressure system and lingered for a much longer period than aerosols transported at higher latitudes. Simulated AOD enhancements are due to a combination of dust, sulfate, and organic and elemental carbons. Dust contribution dominates the AOD enhancements in early May. Model results indicate that dust transport takes place at higher altitude than the other aerosols. MODIS observations indicate a bias in model simulated pathway of dust transport in one out of the three cases analyzed. Sensitivities of dust transport pathways are analyzed in the model. The dipole structure of transport, consisting of the Aleutian Low to the north and the Pacific High to the south, over the Pacific is found to be a key factor. The placement of the dipole structure relative to model parameters such as up-stream wind field and source location may lead to the high sensitivity of simulated transport pathways. |
format |
Article in Journal/Newspaper |
author |
J. Nam Y. Wang C. Luo D. A. Chu |
author_facet |
J. Nam Y. Wang C. Luo D. A. Chu |
author_sort |
J. Nam |
title |
Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport |
title_short |
Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport |
title_full |
Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport |
title_fullStr |
Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport |
title_full_unstemmed |
Trans-Pacific transport of Asian dust and CO: accumulation of biomass burning CO in the subtropics and dipole structure of transport |
title_sort |
trans-pacific transport of asian dust and co: accumulation of biomass burning co in the subtropics and dipole structure of transport |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/acp-10-3297-2010 https://doaj.org/article/9fafc761f6d944ed8cf78843a48d20e5 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_source |
Atmospheric Chemistry and Physics, Vol 10, Iss 7, Pp 3297-3308 (2010) |
op_relation |
http://www.atmos-chem-phys.net/10/3297/2010/acp-10-3297-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-10-3297-2010 1680-7316 1680-7324 https://doaj.org/article/9fafc761f6d944ed8cf78843a48d20e5 |
op_doi |
https://doi.org/10.5194/acp-10-3297-2010 |
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Atmospheric Chemistry and Physics |
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10 |
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7 |
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3297 |
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3308 |
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