1960-2019年河西走廊气候干湿变化及干旱事件特征分析

Based on the monthly precipitation data of 8 weather stations in the Hexi Corridor from 1960 to 2019, using the standardized precipitation index (SPI) and distance inverse weight spatial interpolation methods to analyze the climate dry-wet changes in different spatio-temporal scales and drought events in the Hexi Corridor in the past 60 years. The results show that SPI has different sensitivity to changes in precipitation at different time scales, and a smaller time scale resulted in a more sensitive response to one precipitation event; The inter-decadal, inter-annual and seasonal SPI of the Hexi Corridor are increasing with fluctuations, Among them, the driest year is 1962 and the driest time is the 1960s, the summer humidification is the fastest and the contribution to the annual humidification process is largest; Spatially, in the recent 60 years, both the trend rate of annual SPI value and the trend rate of seasonal SPI value in the Hexi Corridor have increased from northwest to southeast; Most of the 60 years in the Hexi Corridor belong to the whole region drought,there is no obvious drought or light drought,and the occurrence range and intensity of drought show a downward trend.