昆仑山北坡地表水氢氧稳定同位素空间分布特征OA北大核心CSTPCD

Stable hydrogen and oxygen isotopes are widely used as tracers in studying hydrologic processes.Sur-face water is an important component of the water cycle,and it is an effective vehicle for analyzing regional mois-ture sources and modern hydrologic processes.We collected surface water samples from August 2018 to August 2023 on the northern slope of the Kunlun Mountains during the Third Xinjiang Scientific Expedition and mea-sured the stable hydrogen and oxygen isotope values.Additionally,we compiled the previous surface water iso-tope data in the region.We analyzed the spatial distribution characteristics of the stable hydrogen and oxygen iso-topes of surface water on the northern slope of the Kunlun Mountains.The results showed that:(1)The surface water isotope values on the northern slope of the Kunlun Mountains showed spatial variations characterized by low values in the west and high values in the east.The local surface water line is δ2H=5.98×δ18O-6.86(R2=0.65,n=141).(2)A comparison of the stable isotope values of surface water and precipitation on the northern slope of the Kunlun Mountains reveals that the regional surface water isotope value averages are generally lower than the weighted precipitation isotope values.(3)The spatial distribution of surface water isotopes on the northern slope of the Kunlun Mountains is influenced by the interplay of two key factors:the water vapor advection by westerly winds and the local recycled moisture;additionally,evaporation also changed the regional surface water isotope values.