塔什库尔干河谷降水年际异常的水汽输送特征OA

Precipitation in the Taxkorgan Valley,a representative high-altitude cold mountainous region,is a criti-cal driver of the hydrological cycle and water resource dynamics in the eastern Pamir Plateau.However,the quan-titative characteristics of its moisture transport pathways and the mechanisms governing interannual precipitation anomalies remain poorly understood.Using meteorological observations alongside GDAS and ERA5 reanalysis datasets,this study analyzes interannual precipitation anomalies from 2013 to 2023.The HYSPLIT Lagrangian backward trajectory was employed to quantitatively simulate moisture transport pathways.By integrating Euleri-an methods to analyze water vapor fluxes and wind fields,we elucidated moisture transport characteristics and at-mospheric drivers during anomalous precipitation years.The results indicate the following.(1)In the climatologi-cal mean state,precipitation moisture is primarily transported by westerly winds:14.41%from the Atlantic Ocean,39.13%from the Mediterranean region,and 46.46%from terrestrial sources.(2)During the transition from cold to warm seasons,the westerly moisture transport corridor shifts northward.This shift leads to a de-creased proportion of marine moisture from the westerlies and an increased contribution from local moisture recy-cling.Notably,during summer,Indian Ocean moisture bypasses the Qinghai-Xizang Plateau to reach the basin.(3)Effective precipitation in the basin exhibits a significant positive correlation with the stability of the westerlies moisture transport corridor.During anomalously wet years,a southward shift of the westerlies establishes stable and concentrated moisture pathways.Conversely,during anomalously dry years,intensified westerly fluctuations lead to dispersed and truncated trajectories,hindering the formation of sustained moisture conduits.These find-ings clarify the moisture transport mechanisms driving interannual precipitation anomalies in the Taxkorgan Val-ley,providing a scientific basis for regional precipitation forecasting and climate prediction.