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Title: La Niña's diminishing fingerprint on the central Indian summer monsoon
Authors: Samanta, Dhrubajyoti
Rajagopalan, Balaji
Karnauskas, Kristopher B.
Zhang, Lei
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.
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
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