Suppression of south Asian summer monsoon precipitation in the 21st century

Ashfaq , M. and Shi , Y. and W-wen,, T. and et al, . (2009) Suppression of south Asian summer monsoon precipitation in the 21st century. Geophysical Research Letters, 36 (1). pp. 1-5.

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We used a high-resolution nested climate modeling system to investigate the response of South Asian summer monsoon dynamics to anthropogenic increases in greenhouse gas concentrations. The simulated dynamical features of the summer monsoon compared well with reanalysis data and observations. Further, we found that enhanced greenhouse forcing resulted in overall suppression of summer precipitation, a delay in monsoon onset, and an increase in the occurrence of monsoon break periods. Weakening of the large-scale monsoon flow and suppression of the dominant intraseasonal oscillatory modes were instrumental in the overall weakening of the South Asian summer monsoon. Such changes in monsoon dynamics could have substantial impacts by decreasing summer precipitation in key areas of South Asia.

Item Type: Article
Additional Information: We thank three anonymous reviewers for helpful and insightful comments. We thank the Earth System Physics group at the Abdus Salam International Centre for Theoretical Physics for access to the FVGCM simulations, and J. Bewley for helpful discussions. The 50 km simulations were generated using computational resources in the Rosen Center for Advanced Computing, which is supported and administered by Information Technology at Purdue (ITaP). This is PCCRC paper 0717.
Uncontrolled Keywords: Regional climate change, South Asian monsoon
Author Affiliation: Purdue Climate Change Research Center and Department of Earth and Atmospheric Sciences, Purdue University,USA. National Climate Centre, Beijing, China. Frank R. Seaver College of Science and Engineering, Loyola Marymount University, USA.
Subjects: Atmosperic Science > Climatology
Environmental Science
Divisions: General
Depositing User: Mr Arbind Seth
Date Deposited: 04 Aug 2013 13:06
Last Modified: 04 Aug 2013 13:06
Official URL: 10.1029/2008GL036500

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