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Objective Explore the link between aerosols and the Indian summer monsoon rainfall

Mighty Indian Monsoon Responds to the Deserts’ Breath. North Africa/West Asia Dust. Objective Explore the link between aerosols and the Indian summer monsoon rainfall Explain such a link using both observations and climate model simulations Approach

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Objective Explore the link between aerosols and the Indian summer monsoon rainfall

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  1. Mighty Indian Monsoon Responds to the Deserts’ Breath North Africa/West Asia Dust • Objective • Explore the link between aerosols and the Indian summer monsoon rainfall • Explain such a link using both observations and climate model simulations • Approach • Use satellite measurements to find a correlation between Indian monsoon rainfall and aerosol variations over the Arabian Sea, North Africa and West Asia • Confirm that a similar relationship occurs in a global climate model (CAM5) • Propose a mechanism to connect variations in naturally occurring dust aerosols to the west of India with Indian monsoon rainfall on short (~1 week) timescales • Perform simulation experiments that demonstrate why and how the mechanism operates Monsoon Rainfall The hypothesis explains the interaction between remote dust aerosols residing to the west of India affecting monsoon rainfall on short time scales India Moisture • Impact • A simple analysis indicates a distinct, observable relationship between dust aerosol and Indian summer monsoon rainfall with variations that are strongly correlated on timescales of about a week • Although there has been a lot of recent attention on the role of anthropogenic aerosols on the monsoon, this study indicates that natural aerosol variations also play a role. Vinoj V, PJ Rasch, H Wang, J-H Yoon, P-L Ma, K Landu and B Singh. 2014. “Short-term Modulation of Indian Summer Monsoon Rainfall by West Asian Dust.”Nature Geoscience 7. DOI: 10.1038/NGEO2107.

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