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- W2962076947 abstract "Droughts have become more severe and recurrent over the Indian sub-continent during the second half of the twentieth century, leading to more severe hydro-climatic and socio-economic impacts over one of the most densely populated parts of the world. So far, droughts have mostly been connected to circulation changes concomitant with the abnormal warming over the Pacific Ocean, prevalently known as El Niño. Here, exploiting observational data sets and a series of dedicated sensitivity experiments, we show that the severity of droughts during El Niño is amplified (17%) by changes in aerosols. The model experiments simulate the transport of boundary layer aerosols from South Asian countries to higher altitudes (12-18 km) where they form the Asian Tropopause Aerosol Layer (ATAL) (~ 60-120°E, 20-40°N). During El Niño, the anomalous overturning circulation from the East Asian region further enriches the thickness of aerosol layers in the ATAL over the northern part of South Asia. The anomalous aerosol loading in the ATAL reduces insolation over the monsoon region, thereby exacerbating the severity of drought by further weakening the monsoon circulation. Future increases in industrial emissions from both East and South Asia will lead to a wider and thicker elevated aerosol layer in the upper troposphere, potentially amplifying the severity of droughts." @default.
- W2962076947 created "2019-07-23" @default.
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- W2962076947 date "2019-07-16" @default.
- W2962076947 modified "2023-10-17" @default.
- W2962076947 title "Elevated aerosol layer over South Asia worsens the Indian droughts" @default.
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- W2962076947 doi "https://doi.org/10.1038/s41598-019-46704-9" @default.
- W2962076947 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6635485" @default.
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