Influence of Spatial Dipole Pattern in Asian Aerosol Changes on East Asian Summer Monsoon

Liu, Chao; Yang, Yang; Wang, Hailong; Ren, Lili; Wei, Jiangfeng; Wang, Pinya; Liao, Hong

doi:10.1175/jcli-d-22-0335.1

Title: Influence of Spatial Dipole Pattern in Asian Aerosol Changes on East Asian Summer Monsoon

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Abstract

Since China implemented the Air Pollution Prevention and Control Action Plan in 2013, the aerosol emissions in East Asia have been greatly reduced, while emissions in South Asia have continued to increase. This has led to a dipole pattern of aerosol emissions between South Asia and East Asia. We report the East Asian summer monsoon (EASM) responses to the dipole changes in aerosol emissions during 2013–17 are investigated using the atmosphere model of Community Earth System Model version 2 (CESM2). We show that decreases in East Asian emissions alone lead to a positive aerosol effective radiative forcing (ERF) of 1.59 (±0.97) W m^-2 over central-eastern China (25°–40°N, 105°–122.5°E), along with a 0.09 (±0.07)°C warming in summer during 2013–17. The warming intensified the land–sea thermal contrast and increased the rainfall by 0.32 (±0.16) mm day^-1. When considering both the emission reductions in East Asia and increases in South Asia, the ERF is increased to 3.39 (±0.89) W m^-2, along with an enhanced warming of 0.20 (±0.08)°C over central-eastern China, while the rainfall insignificant decreased by 0.07 (±0.16) mm day^-1. It is due to the westward shift of the strengthened western Pacific subtropical high, linked to the increase in black carbon inmore »« less

Authors:

Liu, Chao ^[1];

^[1];

^[2]; Ren, Lili ^[1]; Wei, Jiangfeng ^[1]; Wang, Pinya ^[1]; Liao, Hong ^[1]

Nanjing Univ. of Information Science and Technology (China)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Atmospheric Science and Global Change Div. (ASGC)

Publication Date:: Tue Feb 14 00:00:00 EST 2023

Research Org.:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; Jiangsu Science Fund for Distinguished Young Scholars; Jiangsu Science Fund for Carbon Neutrality

OSTI Identifier:: 1971092

Report Number(s):: PNNL-SA-173018
Journal ID: ISSN 0894-8755

Grant/Contract Number:: AC05-76RL01830; 41975159; 2019YFA0606800; 2020YFA0607803; BK20211541; BK20220031

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Climate

Additional Journal Information:: Journal Volume: 36; Journal Issue: 6; Journal ID: ISSN 0894-8755

Publisher:: American Meteorological Society

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES; monsoons; climate models; aerosol radiative effect; aerosols/particulates

Citation Formats


                    Liu, Chao, Yang, Yang, Wang, Hailong, Ren, Lili, Wei, Jiangfeng, Wang, Pinya, and Liao, Hong. Influence of Spatial Dipole Pattern in Asian Aerosol Changes on East Asian Summer Monsoon.  United States: N. p., 2023. 
Web.  doi:10.1175/jcli-d-22-0335.1.

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                    Liu, Chao, Yang, Yang, Wang, Hailong, Ren, Lili, Wei, Jiangfeng, Wang, Pinya, & Liao, Hong. Influence of Spatial Dipole Pattern in Asian Aerosol Changes on East Asian Summer Monsoon.  United States.  https://doi.org/10.1175/jcli-d-22-0335.1

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                    Liu, Chao, Yang, Yang, Wang, Hailong, Ren, Lili, Wei, Jiangfeng, Wang, Pinya, and Liao, Hong. Tue .  
"Influence of Spatial Dipole Pattern in Asian Aerosol Changes on East Asian Summer Monsoon".  United States.  https://doi.org/10.1175/jcli-d-22-0335.1.  https://www.osti.gov/servlets/purl/1971092.

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@article{osti_1971092,

  title        = {Influence of Spatial Dipole Pattern in Asian Aerosol Changes on East Asian Summer Monsoon},

  author       = {Liu, Chao and Yang, Yang and Wang, Hailong and Ren, Lili and Wei, Jiangfeng and Wang, Pinya and Liao, Hong},

  abstractNote = {Since China implemented the Air Pollution Prevention and Control Action Plan in 2013, the aerosol emissions in East Asia have been greatly reduced, while emissions in South Asia have continued to increase. This has led to a dipole pattern of aerosol emissions between South Asia and East Asia. We report the East Asian summer monsoon (EASM) responses to the dipole changes in aerosol emissions during 2013–17 are investigated using the atmosphere model of Community Earth System Model version 2 (CESM2). We show that decreases in East Asian emissions alone lead to a positive aerosol effective radiative forcing (ERF) of 1.59 (±0.97) W m-2 over central-eastern China (25°–40°N, 105°–122.5°E), along with a 0.09 (±0.07)°C warming in summer during 2013–17. The warming intensified the land–sea thermal contrast and increased the rainfall by 0.32 (±0.16) mm day-1. When considering both the emission reductions in East Asia and increases in South Asia, the ERF is increased to 3.39 (±0.89) W m-2, along with an enhanced warming of 0.20 (±0.08)°C over central-eastern China, while the rainfall insignificant decreased by 0.07 (±0.16) mm day-1. It is due to the westward shift of the strengthened western Pacific subtropical high, linked to the increase in black carbon in South Asia. Based on multiple EASM indices, the reductions in aerosol emissions from East Asia alone increased the EASM strength by almost 5%. Considering the effect of the westward shift of WPSH, the dipole changes in emissions together increased the EASM by 5%–15% during 2013–17, revealing an important role of South Asian aerosols in changing the East Asian climate.},

  doi          = {10.1175/jcli-d-22-0335.1},

  journal      = {Journal of Climate},

  number       = 6,

  volume       = 36,

  place        = {United States},

  year         = {Tue Feb 14 00:00:00 EST 2023},

  month        = {Tue Feb 14 00:00:00 EST 2023}

}

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