Xun Li

Hunan Children's Hospital

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Sarah M. Kang

Ulsan National Institute of Science and Technology

Fukai Liu

Ocean University of China

Lei Zhou

Shanghai Jiao Tong University

Hai Wang

Ocean University of China

Jian Lu

Pacific Northwest National Laboratory

Wenju Cai

CSIRO Oceans and Atmosphere

Yiyong Luo

Ocean University of China

Xiao‐Tong Zheng

Ocean University of China

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Ocean University of China

Qingdao National Laboratory for Marine Science and Technology

Chinese Academy of Sciences

Pacific Northwest National Laboratory

Laoshan Laboratory

McGill University

Nanjing University

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)

South China Sea Institute Of Oceanology

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Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation

Nature Communications (2024)

Fukai Liu Xun Li Yiyong Luo Wenju Cai Jian Lu

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.

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Westerlies

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10.1038/s41467-023-44597-x

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Citations (10)