1980-2024年西藏大气水分输送特征及变化趋势OA

Studying the characteristics and trends of atmospheric water transport in Xizang is crucial for understand-ing the Plateau's water cycle and constructing Xizang's ecological security barrier and highland of ecological civili-zation.This study analyzed atmospheric water transport in Xizang from 1980 to 2024 using ERA5 reanalysis data,employing methods such as boundary grid point transport budget and linear trend estimation.The results indicate that:(1)Xizang experiences annual net inputs of water vapor,cloud liquid water,cloud ice water,and total water of 4434.4×108 t,106.2×108 t,-39.0×108 t,and 4501.6×108 t,respectively,of these,cloud ice water shows the character-istic of net output.The total water input increases monthly in the first half of the year,peaking in July,then decreas-es monthly in the second half,becoming a regional net output in November and December.(2)Net water input boundary grid points are mainly distributed along the boundaries of Nyingchi City,Shannan City,Xigazê City,and the southern and western boundaries of Ngari Prefecture.Some boundary grid points in Nyingchi City and Shannan City have relatively large net inputs,whereas the boundary grid points with net output are mainly distributed along the boundaries of Qamdo City,Nagqu City,and the northern boundaries of Ngari Prefecture.(3)Regarding trans-port changes,the net input along the central and western sections of the Himalayas shows a significant increasing trend,whereas the net input along the northern boundary and parts of southeastern Xizang exhibits a significant de-creasing trend.These findings offer important references for plateau water resource management,artificial weather modification for ecological restoration,and meteorological disaster prevention and mitigation.