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气象:2017,43(6):724-734
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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
刘晶1,2,杨莲梅1,2
(1 中国气象局乌鲁木齐沙漠气象研究所,乌鲁木齐 830002 2 中亚大气科学研究中心,乌鲁木齐 830002)
Development Features of GPS Atmospheric Precipitable Water Vapor in Heavy Rainfall Caused by Central Asia Vortex on the North Slope of Tianshan Mountain
LIU Jing1,2,YANG Lianmei1,2
(1 Institute of Desert Meteorology, CMA, Urumqi 830002 2 Central Asia Research Center of Atmospheric Science, Urumqi 830002)
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投稿时间:2016-07-26    修订日期:2017-03-17
中文摘要: 2015年6月26—28日中亚低涡造成天山北坡出现暴雨天气,本文利用常规观测、NCEP再分析资料及9站地基GPS遥感的大气水汽总量资料(GPS PWV)对这次天气过程水汽特征进行深入研究,结果表明:(1)降水前,500 hPa阿拉伯海水汽经青藏高原向中亚低涡输送,低涡增湿明显;降水期间,500 hPa低涡向北移动并减弱成槽东移,700 hPa孟加拉湾经四川盆地、河西走廊的偏东水汽输送通道建立,与低涡自身偏南(东南)气流在暴雨区上空汇合,暴雨区中低层增湿剧烈;(2)深厚低涡造成的强降水前测站GPS PWV均存在1~3 d增湿过程和1~2次跃变过程,强降水发生前GPS PWV跃变均超过5 mm·(4 h)-1;(3)在同样水汽输送、辐合条件下,干旱区测站GPS PWV急剧增幅越大,地面雨强越强,在一定程度上,水汽输送和水汽的辐合与GPS的剧增存在一定的对应关系;(4)中亚低涡造成的乌鲁木齐强降水发生前4~5 h的GPS PWV增幅达到4 mm以上,GPS PWV峰值往往达到气候平均值2倍左右。
Abstract:From 26 to 28 June 2015, Central Asia vortex caused heavy rainfall in the north slope of Tianshan 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 analysis 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 experienced wetting process from one to three days, the water jumped once or twice before precipitation began caused by the deep low vortex, and GPS PWV jumped more than 5 mm·(4 h)-1. (3) Under the same water 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.
文章编号:     中图分类号:P458    文献标志码:
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
引用文本:
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.
LIU Jing,YANG Lianmei.Development Features of GPS Atmospheric Precipitable Water Vapor in Heavy Rainfall Caused by Central Asia Vortex on the North Slope of Tianshan Mountain[J].METEOROLOGICAL MONTHLY,2017,43(6):724-734.