Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter
Asian emissions of anthropogenic aerosols and their precursors have increased rapidly since 1980, with half of the increase since the pre-industrial era occurring in this period. Transient experiments with the HadGEM3-GC2 coupled model were designed to isolate the impact of Asian anthropogenic aeros...
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ftdoajarticles:oai:doaj.org/article:e8fe57813f2144aa87d0eeb03397a3dd 2023-05-15T17:34:29+02:00 Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter L. J. Wilcox N. Dunstone A. Lewinschal M. Bollasina A. M. L. Ekman E. J. Highwood 2019-07-01T00:00:00Z https://doi.org/10.5194/acp-19-9081-2019 https://doaj.org/article/e8fe57813f2144aa87d0eeb03397a3dd EN eng Copernicus Publications https://www.atmos-chem-phys.net/19/9081/2019/acp-19-9081-2019.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-19-9081-2019 1680-7316 1680-7324 https://doaj.org/article/e8fe57813f2144aa87d0eeb03397a3dd Atmospheric Chemistry and Physics, Vol 19, Pp 9081-9095 (2019) Physics QC1-999 Chemistry QD1-999 article 2019 ftdoajarticles https://doi.org/10.5194/acp-19-9081-2019 2022-12-31T06:18:53Z Asian emissions of anthropogenic aerosols and their precursors have increased rapidly since 1980, with half of the increase since the pre-industrial era occurring in this period. Transient experiments with the HadGEM3-GC2 coupled model were designed to isolate the impact of Asian anthropogenic aerosols on global climate in boreal winter. It is found that this increase has resulted in local circulation changes, which in turn have driven decreases in precipitation over China, alongside an intensification of the offshore monsoon flow. No large temperature changes are seen over China. Over India, the opposite response is found, with decreasing temperatures and increasing precipitation. The dominant feature of the local circulation changes is an increase in low-level convergence, ascent, and precipitation over the Maritime Continent, which forms part of a tropical Pacific-wide La Niña-like response. HadGEM3-GC2 also simulates pronounced far-field responses. A decreased meridional temperature gradient in the North Pacific leads to a positive Pacific–North American circulation pattern, with associated temperature anomalies over the North Pacific and North America. Anomalous northeasterly flow over northeast Europe drives advection of cold air into central and western Europe, causing cooling in this region. An anomalous anticyclonic circulation over the North Atlantic causes drying over western Europe. Using a steady-state primitive equation model, LUMA, we demonstrate that these far-field midlatitude responses arise primarily as a result of Rossby waves generated over China, rather than in the equatorial Pacific. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Pacific Atmospheric Chemistry and Physics 19 14 9081 9095 |
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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 L. J. Wilcox N. Dunstone A. Lewinschal M. Bollasina A. M. L. Ekman E. J. Highwood Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Asian emissions of anthropogenic aerosols and their precursors have increased rapidly since 1980, with half of the increase since the pre-industrial era occurring in this period. Transient experiments with the HadGEM3-GC2 coupled model were designed to isolate the impact of Asian anthropogenic aerosols on global climate in boreal winter. It is found that this increase has resulted in local circulation changes, which in turn have driven decreases in precipitation over China, alongside an intensification of the offshore monsoon flow. No large temperature changes are seen over China. Over India, the opposite response is found, with decreasing temperatures and increasing precipitation. The dominant feature of the local circulation changes is an increase in low-level convergence, ascent, and precipitation over the Maritime Continent, which forms part of a tropical Pacific-wide La Niña-like response. HadGEM3-GC2 also simulates pronounced far-field responses. A decreased meridional temperature gradient in the North Pacific leads to a positive Pacific–North American circulation pattern, with associated temperature anomalies over the North Pacific and North America. Anomalous northeasterly flow over northeast Europe drives advection of cold air into central and western Europe, causing cooling in this region. An anomalous anticyclonic circulation over the North Atlantic causes drying over western Europe. Using a steady-state primitive equation model, LUMA, we demonstrate that these far-field midlatitude responses arise primarily as a result of Rossby waves generated over China, rather than in the equatorial Pacific. |
format |
Article in Journal/Newspaper |
author |
L. J. Wilcox N. Dunstone A. Lewinschal M. Bollasina A. M. L. Ekman E. J. Highwood |
author_facet |
L. J. Wilcox N. Dunstone A. Lewinschal M. Bollasina A. M. L. Ekman E. J. Highwood |
author_sort |
L. J. Wilcox |
title |
Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter |
title_short |
Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter |
title_full |
Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter |
title_fullStr |
Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter |
title_full_unstemmed |
Mechanisms for a remote response to Asian anthropogenic aerosol in boreal winter |
title_sort |
mechanisms for a remote response to asian anthropogenic aerosol in boreal winter |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/acp-19-9081-2019 https://doaj.org/article/e8fe57813f2144aa87d0eeb03397a3dd |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Chemistry and Physics, Vol 19, Pp 9081-9095 (2019) |
op_relation |
https://www.atmos-chem-phys.net/19/9081/2019/acp-19-9081-2019.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-19-9081-2019 1680-7316 1680-7324 https://doaj.org/article/e8fe57813f2144aa87d0eeb03397a3dd |
op_doi |
https://doi.org/10.5194/acp-19-9081-2019 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
19 |
container_issue |
14 |
container_start_page |
9081 |
op_container_end_page |
9095 |
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