Theoretical and Applied Climatology

, Volume 103, Issue 3–4, pp 543–565 | Cite as

Projected changes in South Asian summer monsoon by multi-model global warming experiments

  • S. S. Sabade
  • Ashwini Kulkarni
  • R. H. Kripalani
Original Paper

Abstract

South Asian summer monsoon (June through September) rainfall simulation and its potential future changes are evaluated in a multi-model ensemble of global coupled climate models outputs under World Climate Research Program Coupled Model Intercomparison Project (WCRP CMIP3) dataset. The response of South Asian summer monsoon to a transient increase in future anthropogenic radiative forcing is investigated for two time slices, middle (2031–2050) and end of the twenty-first century (2081–2100), in the non-mitigated Special Report on Emission Scenarios B1, A1B and A2 .There is large inter-model variability in the simulation of spatial characteristics of seasonal monsoon precipitation. Ten out of the 25 models are able to simulate space–time characteristics of the South Asian monsoon precipitation reasonably well. The response of these selected ten models has been examined for projected changes in seasonal monsoon rainfall. The multi-model ensemble of these ten models projects a significant increase in monsoon precipitation with global warming. The substantial increase in precipitation is observed over western equatorial Indian Ocean and southern parts of India. However, the monsoon circulation weakens significantly under all the three climate change experiments. Possible mechanisms for the projected increase in precipitation and for precipitation–wind paradox have been discussed. The surface temperature over Asian landmass increases in pre-monsoon months due to global warming and heat low over northwest India intensifies. The dipole snow configuration over Eurasian continent strengthens in warmer atmosphere, which is conducive for the enhancement in precipitation over Indian landmass. No notable changes have been projected in the El Niño–Monsoon relationship, which is useful for predicting interannual variations of the monsoon.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • S. S. Sabade
    • 1
  • Ashwini Kulkarni
    • 1
  • R. H. Kripalani
    • 2
  1. 1.Indian Institute of Tropical MeteorologyPuneIndia
  2. 2.APEC Climate CenterBusanSouth Korea

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