Scientists Work toward More Reliable Prediction of South Asian Summer Monsoon Rainfall for the Upcoming 15-30 Years

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The South Asian summer monsoon (SASM) provides principal water supply for over a billion people.

In good monsoon years, farmers reap a rich harvest, while in bad monsoon years, severe droughts wipe out crops. And heavy rains during monsoon season cause floods and hit economy.

Policy-makers and stakeholders urgently need projection of SASM for the coming 15-30 years - usually termed as "near future" in climate research community. Unfortunately, there are large uncertainties in the current projection due to climate internal variability.

"Internal variability refers to variations in the mean state due to natural internal processes within the climate system. It is usually regarded as 'noise' in climate projection." Said HUANG Xin, the lead author of a new study published in Science Advances on March 13. HUANG is a doctoral student with the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences, and the University of Chinese Academy of Sciences.

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