一次纬向暴雨过程的湿对称不稳定与锋生分析  

Analysis on Moist Symmetric Instability and Frontogenesis of One Zonal Torrential Rain

作　　者：邓承之 张亚萍 方德贤 翟丹华 吴钲 何跃 DENG Chengzhi;ZHANG Yaping;FANG Dexian;ZHAI Danhua;WU Zheng;HE Yue(Chongqing Meteorological Observatory,Chongqing 401147;Chongqing Institute of Meteorology and Science,Chongqing 401147)

机构地区：[1]重庆市气象台,重庆401147 [2]重庆市气象科学研究所,重庆401147

出　　处：《气象》2019年第11期1527-1538,共12页Meteorological Monthly

基　　金：重庆市基础研究与前沿探索项目(cstc2018jcyjAX0434);重庆市气象局灾害性天气预报核心技术创新团队项目(ZHCXTD-201806);重庆市风暴尺度集合数值预报系统建设项目共同资助

摘　　要：利用常规观测、加密自动站、NCEP/NCAR(1°×1°)再分析及WRF数值模拟资料,诊断分析了2016年6月27—28日重庆南部大暴雨天气的纬向雨带及湿对称不稳定特征,结果表明:(1)纬向雨带形成并发展于低空湿对称不稳定区,纬向雨带形成前,湿对称不稳定逐渐增强,纬向雨带形成后,湿对称不稳定缓慢释放,湿对称不稳定的持续释放促进了纬向雨带的持续发展。(2)纬向锋生效应的增强,引起低空湿位涡水平分量MPV2的负值增长,为湿对称不稳定的增强及维持提供了有利条件,可能是此次暴雨过程中纬向雨带生成及持续发展的重要机制。Using conventional observation data,automatic station data,NCEP/NCAR(1°×1°)reanalysis data and WRF simulation data,this paper diagnostically analyzed the characteristics of the zonal rainband and its moist symmetric instability in the torrential rain that occurred in southern Chongqing and surroun-ding places from 27 to 28 June 2016.The results showed that:(1)The zonal rain belt was formed in the area with low-level moist symmetric instability.The moist symmetric instability increased before the formation of the zonal rain belt,and released gradually after the formation.The sustained release of moist symmetric instability promoted the continuous development of zonal rain belt.(2)The negative increase in horizontal component of moist potential vorticity MPV2 caused by the increase of zonal frontogenesis,was beneficial to the enhancement and maintenance of moist symmetric instability,and probably was the important mechanism of the formation and continuous development of the zonal rain belt in the torrential rain process.

关 键 词：暴雨 湿对称不稳定 湿位涡 纬向锋生 

分 类 号：P433[天文地球—大气科学及气象学] P458