塔里木盆地东南缘大气水汽含量时空特征OA

Water vapor,an important indicator for evaluating precipitation potential,plays a significant role in the scientific development of water resources in arid regions.Therefore,based on the atmospheric water vapor(GPS-PWV)records of three ground-based GPS stations in the southeastern portion of Tarim Basin between 2021 and 2024(January to December)and hourly water vapor pressure and precipitation records from 73 ground-based meteorological observation stations across the region,an empirical calculation model(W-e)suitable for Tarim Basin local conditions was constructed.The spatiotemporal distribution of water vapor(W-PWV)content and the relationship between precipitation and duration of precipitation were determined.The results show the fol-lowing:(1)The annual and seasonal high W-PWV areas are located in the plain regions,followed by the desert re-gions,with the mountainous regions having the lowest W-PWV.(2)For the mountainous regions,W-PWV increas-es in autumn across all altitudes and decreases in spring below 3000 m and in summer above 3000 m.(3)South of 38.5°N and above 1500 m,the W-PWV variation rate is low and the precipitation conversion rate is high 6 hours before precipitation.(4)For different durations of precipitation,the peak W-PWV in the study area and the moun-tainous regions were observed 2-3 hours before precipitation.In the plain regions,the peak W-PWV occurs earli-er with increasing duration of precipitation,whereas in the desert areas,it occurs later with increasing duration of precipitation.