气象2017，Vol.43Issue(6)：724-734,11.DOI:10.7519/j.issn.1000-0526.2017.06.009
一次中亚低涡造成的天山北坡暴雨GPS大气水汽总量演变特征
Development Features of GPS Atmospheric Precipitable Water Vapor in Heavy Rainfall Caused by Central Asia Vortex on the North Slope of Tianshan Mountain
摘要
Abstract
From 26 to 28 June 2015,Central Asia vortex caused heavy rainfall in the north slope of Tians-han Mountain.Using conventional data,NCEP reanalysis data and 9 weather stations'GPS precipitable water vapor (GPS-PWV)observations from the ground-based GPS networks,this article did in-depth a-nalysis on the vapor features in this process.The results show that:(1)before precipitation,at 500 hPa, the water vapor of the Arabian Sea was transported to Central Asia vortex through the Tibetan Plateau, the vortex was obviously moistened;during precipitation,at 700 hPa,the eastward water vapor transport channel was established,which was from Bay of Bengal through the Sichuan Basin and Hexi Corridor,and the easterly airflow and the southerly (SE)airflow of vortex itself converged the vapor in the heavy rain area.So,the lower atmosphere rapidly moistened in the heavy rain area.(2)All stations GPS-PWV expe-rienced wetting process from one to three days,the water jumped once or twice before precipitation begancaused by the deep low vortex,and GPS PWV jumped more than 5 mm·(4 h)-1 .(3)Under the same wa-ter vapor transport and vapor convergence conditions,the stronger the GPS-PWV at stations of arid areas surges,the stronger the rain intensity is.To a certain extent,the water vapor transport and convergence has certain corresponding relationship with GPS-PWV surge.(4)In 4-5 h before the heavy rainfall in Urumqi caused by Central Asia vortex occurred the growth rate of GPS-PWV reached more than 4 mm, and the peak value of GPS-PWV was almost twice of climatic mean.关键词
中亚低涡/暴雨/地基GPS/水汽接力输送Key words
Central Asia vortex/heavy rainfall/ground-based GPS/water vapor relay transport分类
天文与地球科学引用本文复制引用
刘晶,杨莲梅..一次中亚低涡造成的天山北坡暴雨GPS大气水汽总量演变特征[J].气象,2017,43(6):724-734,11.基金项目
公益性行业(气象)科研专项(GYHY201506009)、国家自然科学基金项目(41565003)和国家青年科学基金项目(41505025)共同资助 （气象）
