Mechanisms for a remote response to Asian aerosol emissions in boreal winter
Asian emissions of anthropogenic aerosols 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 aerosols on global climate. In boreal wi...
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ftunivreading:oai:centaur.reading.ac.uk:80726 2024-05-19T07:45:11+00:00 Mechanisms for a remote response to Asian aerosol emissions in boreal winter Wilcox, Laura J. Dunstone, Nick Lewinschal, Anna Bollasina, Massimo Ekman, Annica M. L. Highwood, Eleanor J. 2019 text https://centaur.reading.ac.uk/80726/ https://centaur.reading.ac.uk/80726/9/acp-19-9081-2019.pdf https://centaur.reading.ac.uk/80726/1/acp-2018-980.pdf en eng Copernicus Publications https://centaur.reading.ac.uk/80726/9/acp-19-9081-2019.pdf https://centaur.reading.ac.uk/80726/1/acp-2018-980.pdf Wilcox, L. J. <https://centaur.reading.ac.uk/view/creators/90004004.html> orcid:0000-0001-5691-1493 , Dunstone, N., Lewinschal, A., Bollasina, M., Ekman, A. M. L. and Highwood, E. J. <https://centaur.reading.ac.uk/view/creators/90000039.html> (2019) Mechanisms for a remote response to Asian aerosol emissions in boreal winter. Atmospheric Chemistry and Physics, 19. pp. 9081-9095. ISSN 1680-7375 doi: https://doi.org/10.5194/acp-19-9081-2019 <https://doi.org/10.5194/acp-19-9081-2019> cc_by_4 Article NonPeerReviewed 2019 ftunivreading https://doi.org/10.5194/acp-19-9081-2019 2024-05-01T00:17:35Z Asian emissions of anthropogenic aerosols 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 aerosols on global climate. In boreal winter, it is found that this increase has resulted in local circulation changes, which in turn have driven increases in temperature and decreases in precipitation over China, alongside an intensification of the offshore monsoon flow. 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-Nina-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. An anomalous anticyclonic circulation over the North Atlantic, and an anomalous cyclonic circulation over the Mediterranean drive advection of cold air into Europe, causing cooling in this region. Using a steady-state primitive equation model, LUMA, we demonstrate that these far-field midlatitude response arise primarily as a result of Rossby waves generated over China, rather than in the Equatorial Pacific. Article in Journal/Newspaper North Atlantic CentAUR: Central Archive at the University of Reading Atmospheric Chemistry and Physics 19 14 9081 9095 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
description |
Asian emissions of anthropogenic aerosols 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 aerosols on global climate. In boreal winter, it is found that this increase has resulted in local circulation changes, which in turn have driven increases in temperature and decreases in precipitation over China, alongside an intensification of the offshore monsoon flow. 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-Nina-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. An anomalous anticyclonic circulation over the North Atlantic, and an anomalous cyclonic circulation over the Mediterranean drive advection of cold air into Europe, causing cooling in this region. Using a steady-state primitive equation model, LUMA, we demonstrate that these far-field midlatitude response arise primarily as a result of Rossby waves generated over China, rather than in the Equatorial Pacific. |
format |
Article in Journal/Newspaper |
author |
Wilcox, Laura J. Dunstone, Nick Lewinschal, Anna Bollasina, Massimo Ekman, Annica M. L. Highwood, Eleanor J. |
spellingShingle |
Wilcox, Laura J. Dunstone, Nick Lewinschal, Anna Bollasina, Massimo Ekman, Annica M. L. Highwood, Eleanor J. Mechanisms for a remote response to Asian aerosol emissions in boreal winter |
author_facet |
Wilcox, Laura J. Dunstone, Nick Lewinschal, Anna Bollasina, Massimo Ekman, Annica M. L. Highwood, Eleanor J. |
author_sort |
Wilcox, Laura J. |
title |
Mechanisms for a remote response to Asian aerosol emissions in boreal winter |
title_short |
Mechanisms for a remote response to Asian aerosol emissions in boreal winter |
title_full |
Mechanisms for a remote response to Asian aerosol emissions in boreal winter |
title_fullStr |
Mechanisms for a remote response to Asian aerosol emissions in boreal winter |
title_full_unstemmed |
Mechanisms for a remote response to Asian aerosol emissions in boreal winter |
title_sort |
mechanisms for a remote response to asian aerosol emissions in boreal winter |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://centaur.reading.ac.uk/80726/ https://centaur.reading.ac.uk/80726/9/acp-19-9081-2019.pdf https://centaur.reading.ac.uk/80726/1/acp-2018-980.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://centaur.reading.ac.uk/80726/9/acp-19-9081-2019.pdf https://centaur.reading.ac.uk/80726/1/acp-2018-980.pdf Wilcox, L. J. <https://centaur.reading.ac.uk/view/creators/90004004.html> orcid:0000-0001-5691-1493 , Dunstone, N., Lewinschal, A., Bollasina, M., Ekman, A. M. L. and Highwood, E. J. <https://centaur.reading.ac.uk/view/creators/90000039.html> (2019) Mechanisms for a remote response to Asian aerosol emissions in boreal winter. Atmospheric Chemistry and Physics, 19. pp. 9081-9095. ISSN 1680-7375 doi: https://doi.org/10.5194/acp-19-9081-2019 <https://doi.org/10.5194/acp-19-9081-2019> |
op_rights |
cc_by_4 |
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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1799485158571638784 |