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|Title:||La Niña's diminishing fingerprint on the central Indian summer monsoon||Authors:||Samanta, Dhrubajyoti
Karnauskas, Kristopher B.
Goodkin, Natalie Fairbank
|Keywords:||Science::Physics::Meteorology and climatology
Science::Physics::Geophysics and geomagnetism
|Issue Date:||2020||Source:||Samanta, D., Rajagopalan, B., Karnauskas, K. B., Zhang, L., & Goodkin, N. F. (2020). La Niña's diminishing fingerprint on the central Indian summer monsoon. Geophysical Research Letters, 47(2), e2019GL086237-. doi:10.1029/2019GL086237||Journal:||Geophysical Research Letters||Abstract:||La Niña years tend to provide increased Indian summer monsoon (ISM) rainfall. However, observations show 6–8% reduction in ISM rainfall during post-1980 La Niñas relative to pre-1980. Using a suite of atmospheric general circulation model experiments, we replicate this observed phenomenon and attribute it to a combination of weakening La Niña events themselves plus strongly warming tropical Indian Ocean. We demonstrate that half of the ISM rainfall reduction during post-1980 La Niñas can be attributed to changes in the spatial pattern and intensity of La Niña within the tropical Pacific Ocean. Warmer eastern-equatorial Pacific Ocean temperatures during post-1980 La Niñas weaken the Walker circulation, resulting in large-scale anomalous subsidence over the Indian subcontinent, thereby inhibiting the deep convection that drives ISM rainfall. Further, we demonstrate the declining central ISM rainfall during La Niña years with increasing tropical Indian Ocean warming, which has several serious concerns for regional water resources and stability.||URI:||https://hdl.handle.net/10356/137838||ISSN:||0094-8276||DOI:||10.1029/2019GL086237||Rights:||© 2020 The Author(s). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||ASE Journal Articles|
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