Change Features of Extreme Drought Events in North China
Hu Shunqi
Cao Zhangchi
Liu Tingting
Abstract：With the precipitation data from 72 stations in the North China region between 1961 and 2015,the change characteristics of extreme drought events are studied by simple linear regression,M-K nonparametric test,wavelet transform and fractal theory,etc.The result shows that the frequency of extreme drought events in North China is increasing with fluctuation,and the increase rate is 0.21 times/10a.Extreme drought frequency during 1981-1993 is lower than the average level,while during 1994-2015 is higher than average level and in extreme drought period.Decadal variations of anomaly for extreme drought frequency presents large differences,which alternates positive and negative in 1961-1980,is negative in 1981-1993 and positive in 1994-2015.Analysis mutation of the frequency of extreme drought points out that the year 2003 is a mutation.The frequency Hurst exponent of extreme drought events is 0.55 and has long correlation,which points that in North China the development trend of extreme drought frequency will increase in the next decade.
Keywords：extreme drought eventspatial and temporal distributionNorth China region
Publication Date：2017-10-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 121-125 )