Gaoyuan qixiang (Jun 2024)

The Characteristics of Atmospheric Precipitable Water Vapor Distribution and Its Relationship with Precipitation over Tarim Basin and Its Surrounding Area

  • Jing LIU,
  • Zhaoxu LIU,
  • Lianmei YANG,
  • Yushu ZHOU

DOI
https://doi.org/10.7522/j.issn.1000-0534.2023.00083
Journal volume & issue
Vol. 43, no. 3
pp. 617 – 634

Abstract

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Using the precipitable atmospheric water vapor （PWV） data of 17 ground-based GPS remote sensing stations， hourly and daily precipitation data of 14 meteorological stations in Tarim Basin and its surrounding areas from July 2018 to June 2022， this study analyzed the PWV distribution characteristics and its relationship with precipitation in the western （region A） and the eastern （region B） part of Tarim basin.The results show that： （1） The average annual PWV is largest in the northern and southwestern plain areas of the basin， and the average annual PWV is inversely proportional to the altitude at stations with over 1300 m， while that concentrated on 10~12 mm at stations with altitude below 1300 m.The average PWV value in summer is twice than that in spring and autumn at all GPS stations.（2） The monthly distribution of PWV in region A and region B presents a unimodal type， with the peaks occurred in August and in July， respectively.On the rain-day and no-rain day in region A， the both peak value of PWV occurred at 23:00 （Beijing Time， after the same）， While， the peak value of PWV occurred at 11:00 on rain-day and 17:00 on no-rain day in region B， respectively.（3） The peak of ΔPWV （PWV minus monhly mean PWV） at most stations occurred at 0~1 h before precipitation start time in region A， and within 1 h before and after precipitation in region B.In spring， the variation of PWV before the precipitation in region B is more severe than that in region A.In summer， there are more weather processes with σPWV （PWV divide monthly mean PWV） reached 1~1.8 times at 1 h and 5~6 h before the beginning of precipitation in region A and region B.In autumn and winter， The peak of σPWV are concentrated in 1.4~2.0 times and 1.6~2.4 times in region B， respectively.（4） At the end of precipitation in stations with altitude below 1400 m， the PWV value was concentrated in 10~20 mm during May to June and in 15~25 mm during July to August.In stations with altitude over 1400 m， the PWV value is increasing from 15~25 mm to 25~35 mm from May to August at the end of precipitation.

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