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South Asian Summer Monsoon Precipitation is Sensitive to Southern Hemisphere Subtropical Radiation Changes
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  • Dipti Swapnil Hingmire,
  • Haruki Hirasawa,
  • Hansi Alice Singh,
  • Philip J. Rasch,
  • Soo Kyung Kim,
  • Subhashis Hazarika,
  • Peetak Mitra,
  • Kalai Ramea
Dipti Swapnil Hingmire
University of Victoria

Corresponding Author:[email protected]

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Haruki Hirasawa
University of Victoria
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Hansi Alice Singh
University of Victoria
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Philip J. Rasch
Pacific Northwest National Laboratory (DOE)
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Soo Kyung Kim
SRI International
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Subhashis Hazarika
SRI International
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Peetak Mitra
Excarta
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Kalai Ramea
Planette Inc.
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Abstract

We study the sensitivity of South Asian Summer Monsoon (SASM) precipitation to Southern Hemisphere (SH) subtropical Absorbed Solar Radiation (ASR) changes using Community Earth System Model 2 simulations. Reducing positive ASR biases over the SH subtropics impacts SASM, and is sensitive to the ocean basin where changes are imposed. Radiation changes over the SH subtropical Indian Ocean (IO) shifts rainfall over the equatorial IO northward causing 1-2 mm/day drying south of equator, changes over the SH subtropical Pacific increases precipitation over northern continental regions by 1-2 mm/day, and changes over the SH subtropical Atlantic have little effect on SASM precipitation. Radiation changes over the subtropical Pacific impacts the SASM through zonal circulation changes, while changes over the IO modify meridional circulation to bring about changes in precipitation over northern IO. Our findings suggest that reducing SH subtropical radiation biases in climate models may also reduce SASM precipitation biases.
01 Feb 2024Submitted to ESS Open Archive
02 Feb 2024Published in ESS Open Archive