摘要
利用常规观测资料、ERA5 0.5°×0.5°逐小时再分析资料、NCEP1°×1°GDAS(Global Data Assimilation System)资料、德宏C波段多普勒天气雷达资料等,对2024年6月30日至7月2日保山市连续性强降水天气过程的动力、热力、水汽特征进行分析,结果表明:(1)保山市连续性强降水天气过程,500 hPa高空槽东移南压配合西南暖湿气流是此次过程产生的主要影响系统,西南急流稳定维持使得降雨时间延长。(2)此次暴雨中心水汽输送源地为孟加拉湾北部。强而稳定的水汽通量为此次强降水发生提供了十分有利的水汽条件。进一步分析表明水汽通量的建立与位置南移较此次强降水开始、减弱时间具有明显的提前性,提前约8~12 h。(3)此次过程以稳定性降水为主,由于西南暖湿气流的稳定输送和维持,保山市区域内一直有回波生成和发展,且回波带的走向与降水系统的移向方向夹角小,系统东移在此区域形成了较强的列车效应,导致短时强降水不强,但累积雨量较大。
Using conventional observation Data,hourly reanalysis data of ERA50.5°×0.5°,Global Data Assimilation System(NCEP1°×1°GDAS)data,and C-band Doppler weather radar data of Dehong,etc.,The dynamic,thermal and water vapor characteristics of the continuous heavy precipitation process in Baoshan City from June 30 to July 2,2024 are analyzed.The results show that:(1)Continuous heavy precipitation weather process in Baoshan City.The eastward shifting southward pressure of the 500 hPa upper trough combined with the warm and humid air flow in the southwest was the main influencing system of this process,and the stable maintenance of the southwest jet extended the rainfall time.(2)The central water vapor transport source of the rainstorm was the northern Bay of Bengal.The strong and stable water vapor flux provided very favorable water vapor conditions for the occurrence of the heavy precipitation.Further analysis shows that the establishment and southward shift of water vapor flux are significantly earlier than the beginning and weakening time of the heavy precipitation,about 8-12h earlier.(3)This process is mainly dominated by stable precipitation.Due to the stable transport and maintenance of warm and humid air in the southwest,There had always been echoes generated and developed in the Baoshan City region,and the trend of echo belt has a small Angle with the moving direction of the precipitation system.The eastward movement of the system has formed a strong train effect in this region,resulting in not strong short-term heavy precipitation but large cumulative rainfall.
作者
杨茹娅
杜铠炫
郭燕
祁倩
YANG Ruya;DU Kaixuan;GUO Yan;QI Qian(Meterorological Bureau of BaoShan City,Baoshan 678000,Yunnan,China)
出处
《云南地理环境研究》
2025年第6期55-62,共8页
Yunnan Geographic Environment Research
关键词
保山市
强降水
暴雨
高空槽
西南气流
列车效应
Baoshan City
intense precipitation
heavy rain
upper trough
southwest air flow
train effect
