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气象:2014,40(4):412-423
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一次引发河西走廊大暴雨的高原低涡的机制分析
(1 甘肃省张掖市气象局,张掖 734000;2 甘肃省人工影响天气办公室,兰州 730020)
Mechanism Analysis of the Plateau Vortex Triggered Rainstorm in Hexi Corridor
(1 Zhangye Meteorological Office of Gansu, Zhangye 734000;2 Gansu Provincial Weather Modification Office, Lanzhou 730020)
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投稿时间:2013-01-11    修订日期:2013-11-04
中文摘要: 使用NCEP 1°×1°再分析资料、云图、CINRAD CC多普勒天气雷达、探空、地面加密自动气象站资料,对2012年6月5日发生在河西走廊西部的大暴雨过程进行了诊断分析。结果表明:此次大暴雨是高原低涡加强北移,到达高原北坡时,使河西走廊上空中、低层东风显著加强,与新疆东部东移南下的冷空气在走廊西部产生强烈辐合,同时在高空急流入口区右侧辐散气流的抽吸作用下,产生强大的垂直环流造成的。造成这次大暴雨的水汽主要来源于新疆东部西北气流和高原东北坡偏东气流向走廊中西部的输送。暴雨区上空湿等熵面陡立,大气处于弱不稳定状态,易导致垂直涡度和辐合显著增长。高原低涡发展与高空位涡下传密切相关,同时干冷空气从高原低涡南部侵入中低层,使低涡斜压性增强,有利于低涡发展和向北移出高原。暴雨发生在高原低涡的西北象限内,在低涡逗点云的云头部分,最强暴雨落区在多普勒雷达径向速度图上β中尺度逆风区附近。
Abstract:By using the data of sounding and surface dense AWS, the Doppler weather radar, the satellite cloud images and the NCEP 1°×1° reanalysis data, forming mechanism of the rainstorm on 5 June 2012 in Hexi Corridor is analyzed. The results show that this rainstorm is caused by interactions of the plateau vortex shifting northwards, the cold air moving toward southeast from eastern Xinjiang and the upper level jet. The water vapor transported to the central western corridor is originated from the northwest air flow in eastern Xinjiang and the easterly air flow of north eastern plateau. The isentropic surface over the rainstorm area is steep, atmosphere is weak and unstable easily inducing the marked increase of vertical vorticity and convergence. The dry intrusion that occurs on the south side of plateau vortex from upper troposphere enhances the baroclinity of vortex, which is conducive to vortex development and moving northwards out of the Tibetan Plateau. The rainstorm happens in the confluence area of northwest air stream from eastern Xinjiang and east air stream on the north side of the plateau vortex and in the head part of the vortex comma cloud, and the most severe rainfall occurrs near the meso β scale rebellious wind area of Doppler radar radial velocity.
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基金项目:甘肃省气象局气象科研项目(2013 10)、甘肃省自然科学研究基金计划项目(1208RJZA237)和甘肃省气象局气象科研项目(2014 17)共同资助
引用文本:
王伏村,付双喜,张德玉,阙龙凯,代德彬,2014.一次引发河西走廊大暴雨的高原低涡的机制分析[J].气象,40(4):412-423.
WANG Fucun,FU Shuangxi,ZHANG Deyu,QUE Longkai,DAI Debin,2014.Mechanism Analysis of the Plateau Vortex Triggered Rainstorm in Hexi Corridor[J].Meteor Mon,40(4):412-423.