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Substantial Weakening of Indian Summer Monsoon Synoptic Activity in Response to Polar Sea Ice Melt
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  • Varunesh Chandra,
  • Sukumaran Sandeep,
  • Ettammal suhas,
  • Aneesh Subramanian
Varunesh Chandra
Indian Institute of Technology Delhi
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Sukumaran Sandeep
Indian Institute of Technology Delhi

Corresponding Author:sandeep.sukumaran@cas.iitd.ac.in

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Ettammal suhas
Indian Institute of Science Education and Research Pune
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Aneesh Subramanian
University of Colorado
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The effect of polar sea ice melt on low latitude climate is little known. In order to understand the response of Indian summer monsoon (ISM) to the sea ice melt, we have run a suite of coupled and uncoupled climate model simulations. In one set of simulations, the albedo of sea ice is changed in such a way that it would melt as a result of increased absorption of solar radiation. We find a substantial weakening of ISM in sea ice melt experiments. Further, the genesis frequency of monsoon low-pressure systems (LPS) declines by about 40% in the sea ice melt simulations. A weakening and equatorward shift of ITCZ causes the decline in LPS genesis. Overall, the response of ISM to the sea ice melt resembles the response to greenhouse gas induced warming.