2019年7月28日宁夏区域性暴雨天气过程成因分析  

Analysis on the Cause of Regional Rainstorm in Ningxia on July 28,2019

作　　者：高山 杨苑[1,2,3] 陈星宜 白春燕 GAO Shan;YANG Yuan;CHEN Xingyi;BAI Chunyan(Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Char-acteristicAgriculture in Arid Regions,CMA,Yinchuan 750000,China;Ningxia Key Lab of Meteorological Disaster Prevention andReduction,Yinchuan 750000,China;Zhongwei Bureau of Meteorology,Zhongwei 755000,China)

机构地区：[1]中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室,宁夏银川750000 [2]宁夏气象防灾减灾重点实验室,宁夏银川750000 [3]宁夏中卫市气象局,宁夏中卫755000

出　　处：《河南科技》2024年第15期100-105,共6页Henan Science and Technology

摘　　要：【目的】分析此次暴雨过程的产生机制,以期为今后宁夏暴雨的预报提供参考。【方法】利用ECMWF ERA5的逐时再分析资料,通过环流分析和物理量诊断方法,揭示2019年7月28日宁夏区域性暴雨的产生成因。【结果】此次降水过程是在东高西低环流背景下,西风气流中小股冷空气南下遇副高西伸北抬,形成锋区造成的。副高外围的暖湿气流带来充沛的水汽为此次过程提供所需水汽。700 hPa、850 hPa的切变线及中低层的锋区满足此次降水过程提供了动力抬升条件,并叠加了不稳定能量。【结论】宁夏北部地区以锋区降水为主,中南部地区暖区中有对流云发展,配合锋面抬升,造成对流云叠加,降水强度增大。[Purposes]The mechanism of this rainstorm process was analyzed in order to provide refer⁃ence for the forecast of rainstorm in Ningxia in the future.[Methods]Using the hourly reanalysis data of ECMWF ERA5,the cause of the regional rainstorm in Ningxia on July 28,2019 was revealed by means of circulation analysis and physical quantity diagnosis.[Findings]The results showed that the precipitation process was caused by the front area formed by the cold air moving southward and the northward exten⁃sion of the subtropical high under the background of the east-high and west-low circulation.The warm moist air around the sub-high brings enough moisture to supply the needed moisture for the process.The shear lines of 700hPa and 850hPa and the front areas of the middle and lower layers satisfy the condi⁃tions of dynamic uplift and add unstable energy.[Conclusions]The northern part of Ningxia was domi⁃nated by the frontal precipitation,while the central and southern had convective cloud development in the warm region,which coupled with the rise of the frontal surface,resulted in the superimposition of con⁃vective clouds and the increase of precipitation intensity.

关 键 词：宁夏暴雨 东高西低 暖区降水 中低层锋区 

分 类 号：P458[天文地球—大气科学及气象学]