2020年廊坊市大暴雨天气过程成因分析  

Analysis on Causes of Heavy Rainstorm Weather in Langfang City in 2020

作　　者：刘小雪 许敏 黄浩杰 LIU Xiao-xue(Langfang Meteorological Observatory,Langfang,Hebei 065000)

机构地区：[1]廊坊市气象局,河北廊坊065000

出　　处：《农业灾害研究》2021年第1期92-94,共3页Journal of Agricultural Catastrophology

基　　金：廊坊市气象局2019年科研开发项目(201922)。

摘　　要：利用2020年8月23—24日廊坊市降水实况资料、MICAPS常规气象资料、地面加密观测等资料,对廊坊地区一次区域性大暴雨天气过程进行成因分析。结果表明:此次区域性大暴雨过程是典型的低槽冷锋类暴雨,过程中行星尺度影响系统是南亚高压北侧的副热带西风急流,天气尺度影响系统为高空槽、低空低涡、切变线和冷锋等,中小尺度系统是较长时间维持的中尺度辐合线,高低空系统配合较好;低空辐合,高空强辐散,形成强烈的上升运动,配合良好的水汽条件以及强垂直风切变,使得普通风暴发展成强风暴,最终出现大范围的暴雨、大暴雨天气。Based on the data of precipitation in Langfang from 23 to 24 August 2020,MICAPS conventional meteorological data and ground intensive observation data,this paper analyzed the causes of a regional heavy rainstorm in Langfang.The results show that the regional torrential rain process is formed under the favorable synoptic scale system such as high trough,low altitude vortex,shear line and cold front.Before the rainfall,the local wet layer in Langfang is thick and full of water vapor,and there is strong water vapor convergence in the lower layer,which provides sufficient water vapor for the generation of the heavy rain.The strong divergence zone of the 200 hPa upper-level jet stream is conducive to the formation of suction,and the ground convergence line maintains for a long time to form a strong convergence upward movement,which provides a good dynamic condition for the rainstorm.Strong vertical wind shear makes the normal storm develop into a strong storm,which is conducive to the occurrence of short-term heavy precipitation.

关 键 词：大暴雨 高空槽 低空切变 地面冷锋 

分 类 号：P458.121.1[天文地球—大气科学及气象学]