Response of spatial and temporal distributions of precipitable water vapor on the Qinghai-Xizang Plateau to monsoon index
To comprehend the response of spatial and temporal distributions of precipitable water va-por(PWV)on the Qinghai-Xizang Plateau region and its response to different circulation indices in a complex climate system,based on the atmospheric precipitation data from 1971 to 2020,the at-mospheric precipitation data in the region is explored through El Nino/southern oscillation(ENSO),indian ocean dipole(IOD),westerly circulation index(WCI),partial correlation analysis of precipi-tation and sliding time window analysis.The results are as follows:(1)The precipitation in the mon-soon and westerly regions of the Qinghai-Xizang Plateau from 1971 to 2020 is concentrated from Ju-ly to September.The interannual variation rate of the months with concentrated precipitation is rela-tively high.(2)The distribution of PWV in the westerly region of the Qinghai-Xizang Plateau from August to September is significantly negatively correlated with ENSO index,while that in the mon-soon region in July is significantly negatively correlated with WCI.(3)ENSO index shows a signifi-cant negative correlation with PWV in both westerly and monsoon regions in September across 21 time windows(P＜0.05),while IOD index demonstrates a significant positive correlation with PWV in the monsoon region in September across 17 time windows.The enhancement of IOD may lead to the rapid increase in the rate of precipitation change in the monsoon region of the Qinghai-Xizang Plateau in September from 1991 to 2020.The research results can provide certain data references for further exploring the evolution of climate system in the Qinghai-Xizang Plateau region.
Qinghai-Xizang Plateauprecipitable water vapor(PWV)partial correlation analysisindian ocean dipole(IOD)
NETL
NSTL
万方数据
