一次台风倒槽暴雨过程中的锋生与湿对称不稳定分析  

An Analysis of Moist Symmetric Instability and Frontogenesis of One Rainstorm Caused by the Inverted Trough of Typhoon

作　　者：周明飞 杜小玲 齐大鹏 杨秀庄 ZHOU Mingfei;DU Xiaoling;QI Dapeng;YANG Xiuzhuang(Guizhou Meteorological Observatory,Guiyang 550002,China)

机构地区：[1]贵州省气象台,贵州贵阳550002

出　　处：《中低纬山地气象》2022年第2期1-8,共8页Mid-low Latitude Mountain Meteorology

基　　金：中国气象局预报员专项项目(CMAYBY2019-103):贵州短时强降水概率预报研究;贵州省气象局重要业务科研项目(黔气标合ZY[2020]07号):风功率预报技术研究。

摘　　要：该文利用气象常规观测资料、卫星云图以及NCEP/NCAR(1°×1°)再分析资料,对1822号台风“山竹”给贵州带来的暴雨天气过程中的锋生与湿对称不稳定进行分析。结果发现:①台风“山竹”登陆减弱后,其北部倒槽影响贵州,同时受贵州东低西高的地形影响,倒槽系统出现斜压性,在倒槽附近出现锋生现象,其东侧出现湿对称不稳定的发展,造成贵州暴雨天气。②锋生区的东侧即湿对称不稳定区与中尺度雨带有较好的对应关系。③锋生与湿对称不稳定的发展与增强过程中,伴随着降雨的长时间维持,雨强变化不大,降水率大多为5~10 mm·h^(-1)。当锋生与湿对称不稳定减弱西移后,降雨天气减弱停止。④锋生现象与对称不稳定的形成具有一定的关系,两者均主要是由假相当位温的经向密集区(∂θ_(se)/∂x)发展起来的,对称不稳定区位于锋生区的东侧,即东南暖湿气流中,垂直结构上对称不稳定区位于锋生区的上部,与倾斜的上升运动区相对应。Based on conventional observation data,satellite images and NCEP/NCAR reanalysis data(1°×1°),the frontogenetic and wet-symmetric instability of torrential rain brought by Typhoon 1822"Mangkhu"in Guizhou province are analyzed.The results show that:①After typhoon"Mangkhut"weakened,its northern inverted trough affected Guizhou.At the same time,under the influence of the topography of Guizhou,the inverted trough system appeared baroclinic,frontogenic phenomenon appeared near the inverted trough,and wet symmetry unstable development appeared on its eastern side,resulting in heavy rain in Guizhou.②There is a good correspondence between the east of frontogenetic zone,namely the wet symmetric instability zone,and the mesoscale rain zone.③During the development and enhancement of frontogeny and moist symmetry instability,the rainfall intensity changed little with the long-term maintenance of rainfall,and the precipitation rate was mostly 5-10 mm·h^(-1).When frontogenesis and wet symmetry instability weakened and moved west,rainfall weather weakened and stopped.④the frontogenesis phenomenon and the formation of symmetric instability has a certain relationship,they both happened in the same time and caused by the,the area of CSI.The symmetrical instability zone is located on the east side of the frontogenetic zone,that is,in the southeast warm and humid air flow,and the symmetrical instability zone on the vertical structure is located on the upper part of the frontogenetic zone,corresponding to the inclined upward movement zone.

关 键 词：湿对称不稳定 贵州 锋生 暴雨 

分 类 号：P458.121.1[天文地球—大气科学及气象学]