摘要
从环流形势、弱冷空气影响、大气稳定度、水汽收支等方面分析了2017年6月上旬江苏南部的一次极端暴雨过程,并与该区域同期其他暴雨事件进行了对比。结果表明,暴雨区位于加强的200 hPa西风急流入口区的右侧,偏强的副热带高压西北侧的西南气流与东北冷涡西南侧的西北气流交汇及850 hPa异常的风场切变是造成本次强降水过程的重要条件,中层弱的干冷空气入侵对降水有增幅作用,32.5°N附近江苏西部冷平流和冷锋锋生强度明显强于东部,造成江苏南部西侧降水强于东侧。暴雨区存在明显的条件性对称不稳定,水汽水平辐合强度、垂直输送强度、总的水汽辐合强度和垂直上升运动及潜热加热强度为其他年份同期暴雨过程的3倍,极端性明显。此外,本次过程中气旋的移动路径易导致江苏南部地区出现强降水。
The extreme rainstorm process in southern Jiangsu in early June 2017 was analyzed from the aspects of situation,cold air impact,atmospheric stability and water vapor budget,while also compared with other heavy rain events in the same period.It shows that,first,the rainstorm locates at the right entrance of the enhanced 200 hPa westerly jet,and while the intersection of southwest airflow and northwest airflow as well as anomalous wind field shear at 850 hPa are the important preconditions of this process.Second,cold air intrusion in the middle and lower layers has an increasing effect on precipitation intensity.The intensity of cold advection and cold front frontogenesis in the west of Jiangsu Province near 32.5°N are significantly stronger than that in the east,and the distribution of precipitation is also the same.Finally,There is obvious conditional symmetrical instability in the rainstorm area.Water vapor horizontal convergence intensity,vertical transmission intensity,total water vapor convergence intensity,vertical speed,and latent heat release intensity are extremely strong in 2017,which is three times than that of other years.In addition,path of this cyclone is likely to induce heavy precipitation in southern Jiangsu.
作者
黄文彦
雷正翠
俞剑蔚
姚丽娜
吴建秋
慕熙昱
HUANG Wenyan;LEI Zhengcui;YU Jianwei;YAO Lina;WU Jianqiu;MU Xiyu(Changzhou Meteorological Bureau,Changzhou 213022,China;Jiangsu Meteorological Observatory,Nanjing 210008,China;Jiangsu Institute of Meteorological Sciences,Nanjing 210009,China)
出处
《沙漠与绿洲气象》
2021年第1期9-18,共10页
Desert and Oasis Meteorology
基金
中国气象局预报员专项(CMAYBY2019-043)
江苏省气象局科研基金面上项目(KM201704)
江苏省气象局预报员专项(JSYBY201809)。
关键词
极端暴雨
弱冷空气
相当位涡
水汽收支
气旋
extremely rainstorm
weak cold air
equivalent vortex
water vapor budget
cyclone
