新疆降水－参考蒸散时空分异特征OA

To reveal the spatiotemporal evolution patterns and driving factors of precipitation and refe-rence evapotranspiration in Xinjiang,the spatiotemporal differentiation characteristics and driving effects of precipitation and reference evapotranspiration based on observational data from 66 meteoro-logical stations in Xinjiang from 1951 to 2020 were systematically analyzed.The results show that spa-tially,precipitation exhibits a pattern of ″rainy mountains,dry basins,wet west,and dry east″,with terrain uplift creating high-value precipitation areas(around 500 mm)on windward slopes,while en-closed basins receive less than 150 mm.The reference evapotranspiration shows a pattern of ″high in the south,low in the north,strong in the east,and weak in the west″,with the southern and eastern regions exceeding 1 650 mm,while the northern region mostly ranges between 600 mm and 900 mm.The overall spatial differences are primarily driven by the contrast between dry and wet climates,the Tianshan mountain range′s terrain obstruction,and the combined effect of wind power interactions.Temporally,the multi-year average annual precipitation is 177 mm,with a significant increase of 0.52 mm／a after 1982.Reference evapotranspiration decreases by 1.72 mm／a before 1990 and then shifts to an increasing trend of 3.56 mm／a after 1991.The water－heat synchronization exhibits clear seasonal patterns,peaking simultaneously in summer.Significant spatial heterogeneity exists in the water－heat coupling.The strong negative correlation in northern Xinjiang reflects the inhibitory effect of precipita-tion on evapotranspiration,while the weak correlation in southern Xinjiang suggests that this extremely arid region has approached an ecological regulation threshold.This study reveals the multifaceted dri-ving effects of terrain,circulation,and radiation on precipitation and reference evapotranspiration in Xinjiang,providing a scientific basis for optimizing regional water resource management.