Fast response of global monsoon area and precipitation to regional carbonaceous aerosols

Asutosh, A.; Vinoj, V.; Landu, Kiranmayi; Wang, Hailong

doi:10.1016/j.atmosres.2024.107354

Title: Fast response of global monsoon area and precipitation to regional carbonaceous aerosols

Journal Article · 19 March 2024 · Atmospheric Research

DOI: https://doi.org/10.1016/j.atmosres.2024.107354 · OSTI ID:2439095

Asutosh, A. ^[1]; Vinoj, V. ^[2]; Landu, Kiranmayi ^[2];

^[3]

Indian Institute of Technology Bhubaneswar, Odisha (India); National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
Indian Institute of Technology Bhubaneswar, Odisha (India)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Monsoon exerts a significant social and economic impact on billions of people around the world. Changes in global monsoon (GM) rainfall under global warming have been well studied; however, the understanding of GM connection with regional aerosol emissions is limited. Using an atmospheric general circulation model (AGCM), we attempt to quantify the response of global monsoon area and precipitation to the removal of carbonaceous aerosols over North America (AM), North Africa (AF), Europe (EU), and Asia (AS). Response to the emission removal, the global average aerosol optical depths (AOD) are reduced by 2.21%, 1.8%, 1.16%, and 3.8% respectively. Additionally, a southward shift in the GM domain is observed, responding to changes in magnitude and position of the Inter-Tropical Convergence Zone, when carbonaceous aerosols are removed over these regions in the Northern Hemisphere. The percentage departure in the area-averaged GM precipitation is found to be 4-fold in magnitude for the removal of emissions over EU when compared to that of AM and AF. A shrinkage in the GM area is also observed, which is maximum for EU (~-30%) compared to AM and AF (~-25%). The change in GM precipitation and area are found to be the least and opposite in nature for AS emissions. This study provides insight into the regional nature of carbonaceous aerosol effects on global precipitation.

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

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth & Environmental Systems Science (EESS)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2439095

Report Number(s):: PNNL-SA--169100

Journal Information:: Atmospheric Research, Journal Name: Atmospheric Research Vol. 304; ISSN 0169-8095

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Fast response of global monsoon area and precipitation to regional carbonaceous aerosols

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