Anthropogenic aerosols and the weakening of the south asian summer monsoon

Massimo A. Bollasina, Yi Ming, V. Ramaswamy

Research output: Contribution to journalArticle

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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.

Original languageEnglish (US)
Pages (from-to)502-505
Number of pages4
JournalScience
Volume334
Issue number6055
DOIs
StatePublished - Oct 28 2011

All Science Journal Classification (ASJC) codes

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