河西走廊东部春季复合低温多雨事件的识别及其变化特征OA

Compound low-temperature and rainfall(CTLR)events are among the complex,high-incidence cli-mate extremes occurring in the eastern Hexi Corridor.They are important climate indicators and meteorological disasters that cause more severe damage to agricultural production and the ecological environment than single ex-treme climate events.Based on daily minimum temperature and precipitation data from five meteorological sta-tions(spring of 1960-2024)in the eastern Hexi Corridor,CTLR events were identified and characterized via the percentile threshold method and the principle of maximum proximity.Spatiotemporal characteristics of CTLR events were subsequently analyzed using the inverse distance weighting interpolation and linear trend methods.The results show the following:(1)Springtime and March-May CTLR events in the region assumed distribution characteristics of more in the south,less in the north,ranked by frequency as Gulang>Tianzhu>Liangzhou>Yongchang>Minqin.High-frequency areas were clustered in the Gulang shallow mountainous area,whereas the Minqin desert area served as the low-frequency area.(2)Spring,as well as March and April CTLR events showed decadal and annual decreases,whereas May showed a nonmonotonic trend,increasing first before de-creasing.Peak CTLR frequency years(spring and monthly)varied across regional and local scales,and CTLR ab-sences were recorded in individual years.This provides an important scientific basis and practical reference for agricultural production and ecological security.