2018年“05.07”广州暴雨过程诊断分析  

Analysis of the torrential rain in Guangzhou on May 7,2018

作　　者：魏蕾 张兰 Wei Lei;Zhang Lan(Guangzhou Meteorological Observatory,Guangzhou 511430)

机构地区：[1]广州市气象台,广州511430

出　　处：《气象研究与应用》2020年第3期72-78,共7页Journal of Meteorological Research and Application

基　　金：广东省气象局科学技术研究项目(GRMC2019M25);广州市气象部门科学技术研究项目(201910)。

摘　　要：利用ECMWF每6h一次0.125°×0.125°再分析资料和常规探测资料,采用天气学诊断分析方法,对2018年5月7日广州暴雨过程进行了分析。结果表明:(1)高层疏散槽、中层西风槽前与低空西南大风区为暴雨的形成和加强提供了环境条件,暴雨落区北界与西南大风区北界对应较好;(2)此次过程为锋面低槽降水,暴雨之前及期间广州上空中层干冷中心的存在造成中层持续有干冷空气入侵,可能是此次锋面低槽降水的一个触发机制;(3)暴雨发生前水汽急剧辐合,暴雨结束前水汽率先辐散,上升运动峰值超前于降水峰值出现,对暴雨预报有一定的指示性;(4)湿位涡对这次暴雨预报有较好的参考价值。Based on ECMWF 0.125°×0.125°reanalysis data and conventional sounding data,the causes of the torrential rain on May 7,2018 in Guangzhou were analyzed.The results show that(1)the high-level evacuation trough,the front of the middle-level westerly trough and the low-altitude southwest windy area provided environmental conditions for the formation and strengthening of the rainstorm.The northern boundary of the rainstorm fall area and the north boundary of the southwest windy area corresponded well.(2)This process is precipitation in the frontal low trough.The presence of the dry and cold center in the upper sky of Guangzhou before and during the heavy rain caused continuous dry and cold air intrusion in the middle layer,which may be a trigger mechanism of the frontal low trough precipitation.(3)The water vapor converged sharply before the rainstorm and diverged before the rainstorm ended.The peak of the upward movement appeared ahead of the peak of the precipitation,which is indicative of the rainstorm forecast.(4)The moist potential vorticity has a good reference value for this heavy rain forecast.

关 键 词：暴雨 低空西南大风区 锋面低槽 中层干冷中心 湿位涡 

分 类 号：P458.121.1[天文地球—大气科学及气象学]