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Recent spatial aggregation tendency of rainfall extremes over India

Nikumbh, Akshaya C and Chakraborty, Arindam and Bhat, G S (2019) Recent spatial aggregation tendency of rainfall extremes over India. In: SCIENTIFIC REPORTS, 9 (1).

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Official URL: https://dx.doi.org/10.1038/s41598-019-46719-2


Significant increase in the frequency of occurrences of rainfall extremes has been reported over several parts of the world. These extreme events were defined at individual grids without considering their spatial extent. Here, using ground-based observations over India during boreal summer, we show that the average size of spatially collocated rainfall extremes has been significantly increasing since 1980. However, the frequency of occurrences of such collocated extreme events remains unchanged. Around 90% of the total number of large-sized events (area >= 70 x 10(3) km(2)) of our study period (1951 to 2015) have occurred after 1980. Some of the major floods in recent decades over India are attributed to these large events. These events have distinctive precursory planetary-scale conditions, unlike their smaller counterparts. As the underlying physical mechanisms of extremes rainfall events are size-dependent, their changing spatial extent needs to be considered to understand the observed trends correctly and obtain realistic future projections.

Item Type: Journal Article
Additional Information: copyright for this article belongs to NATURE PUBLISHING GROUP
Department/Centre: Division of Mechanical Sciences > Divecha Centre for Climate Change
Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 02 Aug 2019 11:22
Last Modified: 02 Aug 2019 11:22
URI: http://eprints.iisc.ac.in/id/eprint/63372

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