气象Issue(12)：1550-1560,11.DOI:10.7519/j.issn.1000-0526.2013.12.003
山东省三次暖切变线极强降水的对比分析
Contrastive Analysis on Three Extreme Heavy Rainfalls Triggered by Warm Shear Line in Shandong Provinc
摘要
Abstract
By using dense convective observational data,satellite images,radar data and NCEP/NCAR (1° ×1°)reanalysis data,the weather systems for the three extreme heavy rainfalls are diagnosed and ana-lyzed.The results show that westerly trough at 500 hPa and low-level warm shear line are the main impact system for the three heavy rainfalls.Before the rainfalls,high temperature,high humidity and convection instability exist in lower atmosphere.The ascending movement caused by convergence of low-level shear line and the warm and wet advection and the surface wind convergence line trigger the release of convection instability energy,producing strong convection and extreme rainfall.The strong vertical wind shear makes convection systematically develop.During the heavy rainfalls dry and cold airs invade from middle-upper level so that convection instability gets intensified.On the other hand,the dry and cold airs with high po-tential vortex intruding from middle-upper level induce mesoscale vortex to develop in low-level atmos-phere so that convergence and ascending movement increase.That the warm and wet airs in low-level heli-cally converge and encounter the dry and cold airs from middle-higher level,so the water vapour condensa-tion and rain intensity increase.The periods when the dry and cold airs intrude from middle-higher level correspond with the periods of extremely strong rains.Terrain plays an important part in local and short-time extreme heavy rainfalls.The position and intensity for 500 hPa westerly trough and 850 hPa warm shear line are different and the intensity and tracks of the dry and cold airs at upper level are different,the convective cloud’s development,evolution,movement and internal structure are different,causing the difference of rainstorm areas and intensity.关键词
极强降水/诊断和对比分析/低层暖切变线/高空槽/中高层干冷空气侵入/地形作用/云团特征Key words
extreme severe rainfalls/diagnosis and comparison analysis/low-level warm shear line/higher-level trough/intrusion of middle-higher-level dry and cold airs/terrain effect/cluster features分类
天文与地球科学引用本文复制引用
杨晓霞,吴炜,姜鹏,徐娟,胡顺起,刁秀广,高留喜,王文青,华雯丽..山东省三次暖切变线极强降水的对比分析[J].气象,2013,(12):1550-1560,11.基金项目
中国气象局预报员专项（CMAYBY-2011-026和 CMAYBY-2013-040）及山东省气象局2012和2013年科研项目（2012sdqxz03和2013sdqx01）共同资助 （）
