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On the link between extreme floods and excess monsoon epochs in South Asia

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Abstract

This paper provides a synoptic view of extreme monsoon floods on all the nine large rivers of South Asia and their association with the excess (above-normal) monsoon rainfall periods. Annual maximum flood series for 18 gauging stations spread over four countries (India, Pakistan, Bangladesh and Nepal) and long-term monsoon rainfall data were analyzed to ascertain whether the extreme floods were clustered in time and whether they coincided with multi-decade excess monsoon rainfall epochs at the basin level. Simple techniques, such as the Cramer’s t-test, regression and Mann–Kendall (MK) tests and Hurst method were used to evaluate the trends and patterns of the flood and rainfall series. MK test reveals absence of any long-term tendency in all the series. However, the Cramer’s t test and Hurst-Mandelbrot rescaled range statistic provide evidence that both rainfall and flood time series are persistent. Using the Cramer’s t-test the excess monsoon epochs for each basin were identified. The excess monsoon periods for different basins were found to be highly asynchronous with respect to duration as well as the beginning and end. Three main conclusions readily emerge from the analyses. Extreme floods (>90th percentile) in South Asia show a tendency to cluster in time. About three-fourth of the extreme floods have occurred during the excess monsoon periods between ~1840 and 2000 AD, implying a noteworthy link between the two. The frequency of large floods was higher during the post-1940 period in general and during three decades (1940s, 1950s and 1980s) in particular.

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Acknowledgments

The author wishes to thank Victor Baker and one anonymous reviewer for reviews and helpful comments.

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Correspondence to Vishwas Kale.

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This paper is a contribution to the special issue on Global Monsoon Climate, a product of the Global Monsoon Working Group of the Past Global Changes (PAGES) project, coordinated by Pinxian Wang, Bin Wang, and Thorsten Kiefer.

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Kale, V. On the link between extreme floods and excess monsoon epochs in South Asia. Clim Dyn 39, 1107–1122 (2012). https://doi.org/10.1007/s00382-011-1251-6

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