Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation
Abstract Observational evidence and climate model experiments suggest a slowdown of the Atlantic Meridional Overturning Circulation (AMOC) since the mid-1990s. Increased greenhouse gases and the declined anthropogenic aerosols (AAs) over North America and Europe are believed to contribute to the AMO...
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ftdoajarticles:oai:doaj.org/article:d7b4e4992e744dc49608e600c6d86bc2 2024-02-11T10:05:36+01:00 Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation Fukai Liu Xun Li Yiyong Luo Wenju Cai Jian Lu Xiao-Tong Zheng Sarah M. Kang Hai Wang Lei Zhou 2024-01-01T00:00:00Z https://doi.org/10.1038/s41467-023-44597-x https://doaj.org/article/d7b4e4992e744dc49608e600c6d86bc2 EN eng Nature Portfolio https://doi.org/10.1038/s41467-023-44597-x https://doaj.org/toc/2041-1723 doi:10.1038/s41467-023-44597-x 2041-1723 https://doaj.org/article/d7b4e4992e744dc49608e600c6d86bc2 Nature Communications, Vol 15, Iss 1, Pp 1-9 (2024) Science Q article 2024 ftdoajarticles https://doi.org/10.1038/s41467-023-44597-x 2024-01-14T01:51:57Z Abstract Observational evidence and climate model experiments suggest a slowdown of the Atlantic Meridional Overturning Circulation (AMOC) since the mid-1990s. Increased greenhouse gases and the declined anthropogenic aerosols (AAs) over North America and Europe are believed to contribute to the AMOC slowdown. Asian AAs continue to increase but the associated impact has been unclear. Using ensembles of climate simulations, here we show that the radiative cooling resulting from increased Asian AAs drives an AMOC reduction. The increased AAs over Asia generate circumglobal stationary Rossby waves in the northern midlatitudes, which shift the westerly jet stream southward and weaken the subpolar North Atlantic westerlies. Consequently, reduced transport of cold air from North America hinders water mass transformation in the Labrador Sea and thus contributes to the AMOC slowdown. The link between increased Asian AAs and an AMOC slowdown is supported by different models with different configurations. Thus, reducing emissions of Asian AAs will not only lower local air pollution, but also help stabilize the AMOC. Article in Journal/Newspaper Labrador Sea North Atlantic Directory of Open Access Journals: DOAJ Articles Nature Communications 15 1 |
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Science Q Fukai Liu Xun Li Yiyong Luo Wenju Cai Jian Lu Xiao-Tong Zheng Sarah M. Kang Hai Wang Lei Zhou Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation |
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Abstract Observational evidence and climate model experiments suggest a slowdown of the Atlantic Meridional Overturning Circulation (AMOC) since the mid-1990s. Increased greenhouse gases and the declined anthropogenic aerosols (AAs) over North America and Europe are believed to contribute to the AMOC slowdown. Asian AAs continue to increase but the associated impact has been unclear. Using ensembles of climate simulations, here we show that the radiative cooling resulting from increased Asian AAs drives an AMOC reduction. The increased AAs over Asia generate circumglobal stationary Rossby waves in the northern midlatitudes, which shift the westerly jet stream southward and weaken the subpolar North Atlantic westerlies. Consequently, reduced transport of cold air from North America hinders water mass transformation in the Labrador Sea and thus contributes to the AMOC slowdown. The link between increased Asian AAs and an AMOC slowdown is supported by different models with different configurations. Thus, reducing emissions of Asian AAs will not only lower local air pollution, but also help stabilize the AMOC. |
format |
Article in Journal/Newspaper |
author |
Fukai Liu Xun Li Yiyong Luo Wenju Cai Jian Lu Xiao-Tong Zheng Sarah M. Kang Hai Wang Lei Zhou |
author_facet |
Fukai Liu Xun Li Yiyong Luo Wenju Cai Jian Lu Xiao-Tong Zheng Sarah M. Kang Hai Wang Lei Zhou |
author_sort |
Fukai Liu |
title |
Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation |
title_short |
Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation |
title_full |
Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation |
title_fullStr |
Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation |
title_full_unstemmed |
Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation |
title_sort |
increased asian aerosols drive a slowdown of atlantic meridional overturning circulation |
publisher |
Nature Portfolio |
publishDate |
2024 |
url |
https://doi.org/10.1038/s41467-023-44597-x https://doaj.org/article/d7b4e4992e744dc49608e600c6d86bc2 |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
Nature Communications, Vol 15, Iss 1, Pp 1-9 (2024) |
op_relation |
https://doi.org/10.1038/s41467-023-44597-x https://doaj.org/toc/2041-1723 doi:10.1038/s41467-023-44597-x 2041-1723 https://doaj.org/article/d7b4e4992e744dc49608e600c6d86bc2 |
op_doi |
https://doi.org/10.1038/s41467-023-44597-x |
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Nature Communications |
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15 |
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1 |
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1790602688978747392 |