2021年9月14—15日中卫市局地暴雨天气成因分析  

Cause Analysis of Local Rainstorm in Zhongwei City on September 14-15,2021

作　　者：陈星宜 杨苑[1,2,3] 虎娜 杨贵 张泽瑾 CHEN Xingyi;YANG Yuan;HU Na;YANG Gui;ZHANG Zejin(Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Charac-teristic Agriculture in Arid Regions,CMA,Yinchuan 750002,China;Key Laboratory of Meteorological Disas-ter Prevention and Reduction of Ningxia,Yinchuan 750002,China;Zhongwei Meteorological Bureau,Zhong-wei 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750002 [2]宁夏气象防灾减灾重点实验室,宁夏银川750002 [3]宁夏中卫市气象局,宁夏中卫755000

出　　处：《河南科技》2024年第12期110-114,共5页Henan Science and Technology

摘　　要：【目的】分析2021年9月14—15日中卫市局地暴雨天气过程的形成机理,为中卫市夏季暴雨降水预报工作提供参考。【方法】利用常规地面观测资料、Micpas地面高空形势场、高空湿度、TlnP资料、欧洲中心再分析数据集ECMWF ERA5的逐时再分析资料,对此次暴雨天气进行分析。【结果】584 dagpm线从13日20时起北抬,14日20时抬至最高,此后开始南压,雨带南移,15日20时西西伯利亚槽移出中卫。200 hPa高空急流、500 hPa槽、700 hPa槽及低空急流、850 hPa低涡切变、地面冷锋相互配合,台风外围来自南海和黄海的暖湿空气持续向北输送,高低层湿度条件整体较好,湿层深厚;K指数稳定在33~34℃之间,低层有暖平流,中层有冷平流,有一定的不稳定能量;动力条件较好,南北地区在不同的时段出现了强上升运动中心,北部地区对流层中低层为强辐合区,高层辐散,上升运动较强,正涡度区较为深厚。【结论】此次降水持续时间长、范围广、雨强小、累计雨量大,高空槽有明显的后倾结构,以稳定性降水为主,上升运动中心与湿层深厚区配合较好,产生了此次局地暴雨天气。[Purposes]The formation mechanism of the local rainstorm weather process in Zhongwei City on September 14—15,2021 was analyzed,so as to provide a reference for the forecast work of the sum⁃mer rainstorm and precipitation in Zhongwei City.[Methods]Using conventional ground observation data,Micpas ground high altitude situation field,high altitude humidity,T-lnP data,and hourly reanaly⁃sis data of ECMWF ERA5 reanalysis dataset from European Centre.the local rainstorm weather in Zhong⁃wei city was analyzed on September 14—15,2021.[Findings]The 584 dagpm moved north from 20:00 on the 13th to the highest from 20:00 on the 14th,and then began to pressure south,the rain belt moved south,and the western Siberian trough moved out of the central defender at 20:00 on the 15th.200 hPa high altitude jet,500 hPa trough,700 hPa trough and low altitude jet,850 hPa low vortex shear and sur⁃face cold front cooperate with each other.The warm and humid air from the South China Sea and the Yel⁃low Sea around the typhoon continues to transport northward.The humidity conditions in the upper and lower layers are generally good,and the wet layer is deep.K index is stable between 33 and 34℃,and the low layer has warm low flow,while the moderate layer has cold flow and certain unstable energy;dy⁃namic conditions are good,strong rising movement center appears in this area at different times.And in the northern region,the middle and lower troposphere is a strong convergence zone,the upper layer is di⁃vergent,the ascending motion is strong,and the positive vorticity area is relatively deep.[Conclusions]The precipitation is characterized by long duration,wide range,small rainfall intensity and large cumula⁃tive rainfall.The upper trough has a clear backward structure,which is mainly stable precipitation.The ascending motion center and the deep wet layer are well coordinated,resulting in the local rainstorm weather.

关 键 词：中卫市 局地暴雨 成因分析 

分 类 号：P458.3[天文地球—大气科学及气象学]