| 巢湖地区一次梅雨期强对流暴雨中尺度特征分析 |
| |
| 引用本文： | 范裕祥,杨彬,王玉红,章家银,刘汉武,王文本,金社军.巢湖地区一次梅雨期强对流暴雨中尺度特征分析[J].气象科技,2020,48(5):731-740. |
| |
| 作者姓名： | 范裕祥 杨彬 王玉红 章家银 刘汉武 王文本 金社军 |
| |
| 作者单位： | 安徽省巢湖气象局,巢湖238000;安徽省公共气象服务中心,合肥230031 |
| |
| 基金项目： | 国家重点研发计划（2018YFC1507800）资助 |
| |
| 摘 要： | 利用地面气象观测资料、ERA5再分析资料、FY-2E卫星和多普勒雷达资料,对2011年7月17日发生在巢湖地区的一次强对流暴雨过程进行诊断分析。结果显示:500hPa深槽、850hPa切变线及地面低压是此次暴雨过程的天气尺度影响系统,强降水发生在湿层和暖云层深厚、较低的抬升凝结高度、中等强度对流不稳定及弱垂直风切变条件下;FY-2E卫星云图分析表明,此次强降水过程主要是多个中尺度对流系统在巢湖合并所致,短时强降水落区主要落在中尺度对流系统TBB等值线密集区附近,TBB中心强度越强,TBB等值线梯度越大,对应的1h降水量越强;多普勒雷达分析揭示,短时强降水发生在两个对流回波合并期间,对流风暴移动缓慢,大于45dBz强回波均在6km以下,呈低层强烈气旋式辐合、高层辐散特征;地面中尺度辐合线是此次风暴的触发因子;湿位涡诊断结果表明,600hPa以下对流不稳定,600hPa以上对称不稳定,有利于暴雨和中尺度系统的发生发展。
|
| 关 键 词： | 暴雨 中尺度对流系统 多普勒雷达特征 湿位涡 |
| 收稿时间： | 2019/9/26 0:00:00 |
| 修稿时间： | 2020/5/18 0:00:00 |
Mesoscale Characteristic Analysis of a Strong Convective Rainstorm in Chaohu Lake during Meiyu Period |
| |
| FAN Yuxiang,YANG Bin,WANG Yuhong,ZHANG Jiayin,LIU Hanwu,WANG Wenben,JIN Shejun.Mesoscale Characteristic Analysis of a Strong Convective Rainstorm in Chaohu Lake during Meiyu Period[J].Meteorological Science and Technology,2020,48(5):731-740. |
| |
| Authors: | FAN Yuxiang YANG Bin WANG Yuhong ZHANG Jiayin LIU Hanwu WANG Wenben JIN Shejun |
| |
| Institution: | Chaohu Meteorological Service, Anhui, Chaohu 238000;Anhui Public Meteorological Service Center, Hefei 230031 |
| |
| Abstract: | Using the ground meteorological observation data, ERA5 reanalysis data, FY 2E satellite and Doppler radar data, a diagnosis and analysis of a severe convective rainstorm occurred in Chaohu on 17 July 2011 is made. The weather analysis shows that the 500hPa deep trough, the 850hPa shear line, and the ground low pressure were the synoptic scale impact systems of the heavy rain process. The precipitation process occurred in the deep wet and warm clouds, low LCL (Lifting Condensation Level), medium convection instability and weak vertical wind shear. The FY 2E satellite cloud image analysis shows that the heavy precipitation process was mainly caused by the merger of multiple mesoscale convective systems in Lake Chaohu, and the short term heavy precipitation area mainly fell near the TBB isoline dense area of the mesoscale convective system. The stronger the TBB center intensity, the larger the TBB contour gradient, the stronger the corresponding 1 hour precipitation would be. Doppler radar analysis reveals that short term heavy precipitation occurred during the merge of two convection echoes. The convective storm moved slowly, and the strong echoes greater than 45 dBz were below 6 km, showing low level strong cyclonic convergence and high level divergence. The ground mesoscale convergence line was the trigger of the storm. The diagnostic results of wet potential vorticity show that convective instability below 600 hPa and symmetrical instability above 600 hPa are beneficial to the occurrence and development of heavy rain and mesoscale systems. |
| |
| Keywords: | rainstorm mesoscale convective system Doppler radar characteristic moist potential vorticity |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《气象科技》浏览原始摘要信息 |
| 点击此处可从《气象科技》下载免费的PDF全文 |
|
