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气象:2016,42(6):716-723
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一次春季江淮气旋形成发展特征及暴雨诊断分析
(淮河流域气象中心,合肥 230031)
Formation and Development Mechanism of One Cyclone Over Changjiang Huaihe River Basin and Diagnostic Analysis of Rainstorm
(Huaihe River Basin Meteorological Centre, Anhui Provice, Hefei 230031)
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投稿时间:2014-06-16    修订日期:2016-02-18
中文摘要: 利用NCEP/NCAR的再分析资料,对2013年5月25—27日一次江淮气旋的形成发展及其引发的暴雨过程进行了诊断分析。结果表明:高空明显的正涡度平流、低层暖平流以及与辐合辐散区相对应的垂直运动是导致气旋发展的重要物理因子。气旋发展过程和湿位涡正压项及斜压项有很好的对应关系,气旋的增强阶段伴随对流层低层mpv1的增大及mpv2值的减小;高层湿位涡下传;使近地面大气斜压性增强,从而在低层诱生出气旋性环流。气旋的形成发展过程与对流层正涡度柱的形成相对应,与湿位涡的空间结构及其演变有密切的联系。气旋引发的暴雨位于气旋移动路径的左前方(东北象限),该区域低层强辐合中心和正涡度中心的耦合,加剧水汽和能量的辐合,为暴雨维持提供了条件。
Abstract:The diagnosis analysis for the development mechanism of a cyclone over Changjiang Huaihe and rainstorm that occurred from 25 to 27 May 2013 was studied utilizing the NCEP/NCAR reanalysis data. The results indicate that positive vorticity advection in upper level, warm air advection in lower level, the divergence located in the right side of the entry of upper jet and convergence located in the left side of the exit of low jet are the most important physical factors for the developing of the cyclone. The development of cyclone is consistent with the mpv1 and mpv2 of moist potential vorticity. Formation and development mechanisms of the cyclone correspond to development of vorticity column troposphere, and the download of positive vorticity advection in upper level intensifies the vortex in lower troposphere. The downward extension of moist potential vorticity could have increased the positive vorticity in the lower level and induced cyclonic circulation. The rainstorm triggered by the cyclone is located in the left front of moving track of the cyclone. Coupling structure of intensity convergence and positive vorticity center enhances the convergence of water vapor and energy, which creates the conditions for the maintenance of rainstorm.
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基金项目:公益性行业(气象)科研专项(GYHY201006037)资助
引用文本:
张晓红,罗静,陈兴,靳莉莉,邱旭敏,2016.一次春季江淮气旋形成发展特征及暴雨诊断分析[J].气象,42(6):716-723.
ZHANG Xiaohong,LUO Jing,CHEN Xing,JIN Lili,QIU Xuming,2016.Formation and Development Mechanism of One Cyclone Over Changjiang Huaihe River Basin and Diagnostic Analysis of Rainstorm[J].Meteor Mon,42(6):716-723.