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Anthropogenic Aerosols and the Weakening of the South Asian Summer Monsoon

Author(s): Bollasina M, Ming Y, Ramaswamy V

Published: September, 2011

Publisher: Science

DOI: 10.1126/science.1204994

Tags: Tropospheric Aerosols, Precipitation, Climate Modelling

URL: http://www.sciencemag.org/content/334/6055/502

Abstract: Observations show that South Asia underwent a widespread summertime drying during the second half of the 20th century, but it is unclear whether this trend was due to natural variations or human activities. We used a series of climate model experiments to investigate the South Asian monsoon response to natural and anthropogenic forcings. We find that the observed precipitation decrease can be attributed mainly to human-influenced aerosol emissions. The drying is a robust outcome of a slowdown of the tropical meridional overturning circulation, which compensates for the aerosol-induced energy imbalance between the Northern and Southern Hemispheres. These results provide compelling evidence of the prominent role of aerosols in shaping regional climate change over South Asia.


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