东北冷涡引发的一次区域持续性暴雨天气过程诊断分析  

Diagnostic Analysis of A Regional Persistent Rainstorm Caused by the Northeast Cold Vortex

作　　者：战莘晔 高清源 徐庆喆 田璐 Zhan Shen-ye(Anshan Meteorological Bureau,Liaoning,Anhui 114004)

机构地区：[1]鞍山气象局,辽宁鞍山114004

出　　处：《农业灾害研究》2023年第7期213-215,共3页Journal of Agricultural Catastrophology

摘　　要：利用常规气象观测资料、NCEP 1°×1°逐6 h再分析资料、探空和卫星云图资料,对鞍山地区2019年7月29—30日一次区域持续性暴雨天气过程进行了降水成因分析与物理量场的诊断分析。结果表明:低空冷涡切变东移与副热带高压西伸北抬为此次强降水天气提供了大尺度环流背景,700 hPa低空急流建立了水汽输送通道,将西南暖湿空气向辽宁地区输送,为此次鞍山地区暴雨天气过程提供了较好的水汽条件;由于副高西伸北抬,暖湿气流不断与低涡后部冷空气在辽宁交汇,形成列车效应。此外,K指数较大,大气层结不稳定,具有对流降水特征。Using conventional mete-orological observation data and NCEP 1°×1°reanalysis data,radiosonde data and satellite cloud image data every 6 hours,the precipitation cause analysis and physical quantity field diagnosis analysis of a regional persistent rainstorm weather process in Anshan area from July 29 to 30,2019 were carried out.The results showed that the low level cold vortex shear moving eastward and the Horse latitudes moving westward and northward provide a large-scale circulation background for this heavy rainfall weather.The 700 hPa low level jet has established a water vapor transport channel to transport warm and humid air from southwest to Liaoning,providing a better water vapor condition for this rainstorm weather process in Anshan.Due to the westward extension and northward uplift of the subtropical high,warm and humid airflow continuously intersects with the cold air behind the low vortex in Liaoning,forming a train effect.In addition,the K index was large,the atmospheric stratification was unstable,and it has convective precipitation characteristics.

关 键 词：低涡切变 副热带高压 水汽通量散度 强降水天气 

分 类 号：P458.121.1[天文地球—大气科学及气象学]