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Recent decadal weakening of the summer Eurasian westerly jet attributable to anthropogenic aerosol emissions

Author

Listed:
  • Buwen Dong

    (University of Reading)

  • Rowan T. Sutton

    (University of Reading)

  • Len Shaffrey

    (University of Reading)

  • Ben Harvey

    (University of Reading)

Abstract

The Eurasian subtropical westerly jet (ESWJ) is a major feature of the summertime atmospheric circulation in the Northern Hemisphere. Here, we demonstrate a robust weakening trend in the summer ESWJ over the last four decades, linked to significant impacts on extreme weather. Analysis of climate model simulations from the Coupled Model Intercomparison Project Phase 6 (CMIP6) suggests that anthropogenic aerosols were likely the primary driver of the weakening ESWJ. Warming over mid-high latitudes due to aerosol reductions in Europe, and cooling in the tropics and subtropics due to aerosol increases over South and East Asia acted to reduce the meridional temperature gradient at the surface and in the lower and middle troposphere, leading to reduced vertical shear of the zonal wind and a weaker ESWJ in the upper troposphere. If, as expected, Asian anthropogenic aerosol precursor emissions decline in future, our results imply a renewed strengthening of the summer ESWJ.

Suggested Citation

  • Buwen Dong & Rowan T. Sutton & Len Shaffrey & Ben Harvey, 2022. "Recent decadal weakening of the summer Eurasian westerly jet attributable to anthropogenic aerosol emissions," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28816-5
    DOI: 10.1038/s41467-022-28816-5
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    References listed on IDEAS

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    1. Yuan Wang & Tianhao Le & Gang Chen & Yuk L. Yung & Hui Su & John H. Seinfeld & Jonathan H. Jiang, 2020. "Reduced European aerosol emissions suppress winter extremes over northern Eurasia," Nature Climate Change, Nature, vol. 10(3), pages 225-230, March.
    2. Yuan Wang & Tianhao Le & Gang Chen & Yuk L. Yung & Hui Su & John H. Seinfeld & Jonathan H. Jiang, 2020. "Publisher Correction: Reduced European aerosol emissions suppress winter extremes over northern Eurasia," Nature Climate Change, Nature, vol. 10(6), pages 582-582, June.
    3. Nathan P. Gillett & Megan Kirchmeier-Young & Aurélien Ribes & Hideo Shiogama & Gabriele C. Hegerl & Reto Knutti & Guillaume Gastineau & Jasmin G. John & Lijuan Li & Larissa Nazarenko & Nan Rosenbloom , 2021. "Constraining human contributions to observed warming since the pre-industrial period," Nature Climate Change, Nature, vol. 11(3), pages 207-212, March.
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    Cited by:

    1. Efi Rousi & Kai Kornhuber & Goratz Beobide-Arsuaga & Fei Luo & Dim Coumou, 2022. "Accelerated western European heatwave trends linked to more-persistent double jets over Eurasia," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. Lifei Lin & Chundi Hu & Bin Wang & Renguang Wu & Zeming Wu & Song Yang & Wenju Cai & Peiliang Li & Xuejun Xiong & Dake Chen, 2024. "Atlantic origin of the increasing Asian westerly jet interannual variability," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    3. Fukai Liu & Xun Li & Yiyong Luo & Wenju Cai & Jian Lu & Xiao-Tong Zheng & Sarah M. Kang & Hai Wang & Lei Zhou, 2024. "Increased Asian aerosols drive a slowdown of Atlantic Meridional Overturning Circulation," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    4. Zhili Wang & Yadong Lei & Huizheng Che & Bo Wu & Xiaoye Zhang, 2024. "Aerosol forcing regulating recent decadal change of summer water vapor budget over the Tibetan Plateau," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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