Meteorological drought variation characteristics of Northern Xinjiang from 1961 to 2020 based on SPEI
Based on the daily meteorological data of 26 major meteorological stations in Northern Xinjiang from 1961 to 2020,the stan-dardized precipitation evapotranspiration index(SPEI)was selected as the meteorological drought index,and Mann-Kendall mutation test and wavelet analysis were used to explore the variation characteristics of SPEI and the influence of different grades of meteorologi-cal drought in Northern Xinjiang in annual,spring and summer.The results showed that the actual mild drought situation in Northern Xinjiang was more suitable for identification by-1.0<SPEI≤0.Contrary to the trend of humidification at the annual scale,the North-ern Xinjiang showed different degrees of aridification in spring and summer,and the influence range of extreme meteorological drought(severe drought and extreme drought)events in summer expanded significantly.There was a main change cycle of 1～4 years for SPEI at different scales from 1961 to 2020.The overall climate of Northern Xinjiang showed a significant humidification trend from 1993 to 2010 after the transformation of the 1980s,but the spring and summer climate showed a trend signal from wet to dry in 2014 and 1997,respectively.The drought in the summer of the study area began to gradually ease in 1988,but the drought began to gradually intensify after another mutation in 2008.
standard precipitation evapotranspiration index(SPEI)meteorological droughtwavelet analysisMann-Kendall muta-tion testNorthern Xinjiang
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