2023年2月郴州市一次连阴雨天气过程分析  

Analysis of A Continuous Cloudy and Rainy Weather Process in Chenzhou City in February 2023

作　　者：宋楠 王佩 Song Nan(Chenzhou Meteorological Bureau,Chenzhou,Hunan 423000)

机构地区：[1]湖南省郴州市气象局,湖南郴州423000

出　　处：《农业灾害研究》2023年第11期246-248,252,共4页Journal of Agricultural Catastrophology

基　　金：湖南省气象局创新发展专项(CXFZ2022-FZZX01);郴州市气象局2023年科研创新发展专项(CZQXKJ2023-B07)。

摘　　要：利用NCEP-NCAR再分析资料和常规观测资料,从环流形势、水汽、动力和热力条件等方面对2023年2月1—14日郴州市出现的连阴雨天气过程进行了分析,结果表明:(1)此次连阴雨过程环流形势整体为两槽一脊型,乌拉尔山阻塞高压或附近暖高脊前部为西北气流控制,中纬度西风带中的短波槽带动冷空气从偏东路径小股南下,孟加拉湾槽和西太平洋副热带高压将暖湿气流向北输送,形成了冷暖气流长时间对峙的局面,准静止锋稳定维持,是这次连阴雨天气的主要原因。(2)中低层西南气流为连阴雨的发生提供持续的水汽供应,弱的垂直上升运动造成持续稳定的降雨。(3)连阴雨期间水汽主要来源于南海、孟加拉湾和西太平洋,连阴雨的发生不一定需要强的水汽通量辐合,持续的水汽供应相对更重要。(4)本次连阴雨过程为冷空气影响演变为准静止锋而形成,连阴雨期间静止锋区一直维持在25至30°N,锋区南北范围较大,且稳定少动,有利于连阴雨天气维持。Using NCEP-NCAR reanalysis data and conventional observation data,the continuous cloudy and rainy weather process that occurred in Chenzhou City from February 1 to 14,2023,was analyzed from the aspects of circulation situation,water vapor,power,and thermal conditions.The results show that:(1) the overall circulation situation of this continuous cloudy and rainy process was two troughs and one ridge type,and the front of the blocking high pressure or nearby warm high ridge in the Ural Mountains is controlled by northwest airflow,The short wave trough in the mid latitude westerly belt drives cold air from the easterly path to the south,while the Bay of Bengal trough and the Western Pacific subtropical high transport warm and humid airflow northward,forming a long-term confrontation between cold and warm airflow.The stable maintenance of a quasi static front was the main reason for this continuous cloudy and rainy weather.(2) The southwest airflow in the middle and lower layers provides a continuous supply of water vapor for the occurrence of continuous rain,and the weak vertical upward movement causes sustained and stable rainfall.(3) During continuous rain,water vapor mainly comes from the South China Sea,Bay of Bengal,and Western Pacific.The occurrence of continuous rain does not necessarily require strong water vapor flux convergence,and continuous water vapor supply was relatively more important.(4) The continuous cloudy and rainy process was formed due to the influence of cold air evolving into a quasi stationary front.During the continuous cloudy and rainy period,the stationary front area remained at 25 to 30°N,with a large north-south range of the front area and stable with little movement,which was conducive to the maintenance of continuous cloudy and rainy weather.

关 键 词：连阴雨 环流形势 天气过程 

分 类 号：P458.121[天文地球—大气科学及气象学]