基于大气降水水化学和环境同位素的青藏高原水文循环类型OA

Clarifying the hydrological cycle of Tibetan Plateau from the perspective of regional atmospher-ic circulation can help understand the water resources status,mitigate water security risks,and optimize water resources allocation.Tibetan Plateau can be divided into four major zones,it is crucial to analyze and compare the hydrological cycle types across these zones from a holistic perspective.We collected the hydrochemistry data of the precipitation in Tibetan Plateau since 1998 and environmental isotopic data since 2000 of the precipitation in Tibetan Plateau,and analyzed the differences in hydrological cycles be-tween the four zones based on the characteristics of these data in Gibbs,δ18 O,tritium concentration,and deuterium surplus.According to the analysis of the hydrochemistry and environmental isotopes of the pre-cipitation in Tibetan Plateau the hydrological cycle types of all four zones are consistent.The middle and upper reaches of the Yarlung Zangbo River is governed by regional hydrological cycle,with dominant oce-anic-source atmospheric circulation on the lower reaches below the Grand Canyon.The regional hydrolog-ical cycle and oceanic-source atmospheric circulation in the plateau internal flowing zone are both present and indistinguishable.The Chaidamu Basin zone is also governed by regional hydrological cycle,with ad-ditional contributions from oceanic-source atmospheric circulation.The Three-River Source zone have both regional hydrological cycle and oceanic-source atmospheric circulation with either one dominating or the other.From the perspective of the hydrological cycle,the water resources in the Yarlung Zangbo Riv-er are concentrated in the river section downstream of the Grand Canyon,and its development by China has minimal impact on the water resources of neighboring countries.