Spatial and temporal evolution characteristics of extreme rainfall in Guangxi from 1951 to 2015
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Abstract:
Based on two kinds of high spatial and temporal resolution daily rainfall time series data from 1951 to 2015, 11 extreme rainfall indices are selected to comprehensively characterize the multi-scale non-linear spatial and temporal evolution o f extreme rainfall events in Guangxiusing Mann-Kendall ( M2K ) test and pole symmetric mode decomposition. The results show that: except for continuo us wetday s ( CWD) and moderate rainy days ( R10 ) , the other 9 extreme rainfall indices showed a downward trend, and the rest of the other 9 indices showed a significant increasing trend from 1951 to 2015 in Guang xi, the high-value area of the CDD ( continuo us dry-day ) index in Guangxi is located in western and eastern Guangxi, while the other indexes show the decreasing spatial distribution characteristics from northeast and south to southwest and northwest Guang xi, various extreme rainfall indices show that the evolution o f extreme rainfall in Guang xi occurs mainly in the vicinity of 2008 to 2010, there are 2.85 - 3.34 a and 5.34 - 9.19 a interdecadal quasi-cycles in the evolution of extreme rainfall in Guang x i, and 10 .09 - 17.11 a and 22. 35 - 35.62 a interdecadal quasi-cycles, respectively, and the fluctuation of multiple cycles is mainly due to the contribution of the interannual variation of extreme rainfall.
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