摘要
文章利用ERA5、区域自动站,新一代多普勒天气雷达及FY-4卫星资料,对2024-08-09-10四川东部一次强对流暴雨天气过程进行分析,结果表明:100 hPa南亚高压属于西部型,500 hPa副热带高压东退北抬,使雨带位置发生变化,700 hPa与850 hPa四川东部存在弱辐合;大气不稳定能量强,θse在600~850 hPa随高度减小,低层正涡度与高层负涡度相互作用,为大气上升运动提供抬升条件,水汽不断辐合,提供了有利的水汽条件;短时强降水发生时,雷达回波常表现为结构紧密的带状回波,发展高度高,具有明显的后向传播特征。剖面图上低质心暖云降水特征明显;MCC系统造成的降水范围大、雨强强、分布较集中,卫星云图上TBB最小值达-90℃,-80℃冷云区面积和MCC的总降水量存在一定的正相关,-80℃冷云区面积越大,MCC总降水量也越大。
The article analyzes a severe convective rainstorm event that occurred in eastern Sichuan on August 9-10,2024,utilizing data from ERA5,regional automatic weather stations,a new generation of Doppler weather radar,and FY-4 satellite data.The results indicate that the 100 hPa South Asia High is of the western type,while the 500 hPa Subtropical High retreats eastward and rises northward,causing changes in the location of the rain belt.There is weak convergence between 700 hPa and 850 hPa in eastern Sichuan;the atmospheric unstable energy is strong,withθse decreasing with height from 600 to 850 hPa.The positive vorticity in the lower layers interacts with the negative vorticity in the upper layers,providing lifting conditions for atmospheric ascending motion.Water vapor continues to converge,providing favorable conditions for water vapor.When short-term heavy precipitation occurs,radar echoes often exhibit tightly structured band-like echoes with high development heights and obvious backward propagation characteristics.On the profile map,the precipitation characteristics of low-centroid warm clouds are evident;the precipitation caused by the MCC system has a large range,strong rainfall intensity,and a relatively concentrated distribution.On the satellite cloud image,the minimum TBB reaches-90℃,and there is a certain positive correlation between the area of the-80℃cold cloud region and the total precipitation of the MCC.The larger the area of the-80℃cold cloud region,the greater the total precipitation of the MCC.
作者
黎金鑫
李晓容
刘原江
Li Jinxin;Li Xiaorong;Liu Yuanjiang(Nanchong Meteorological Bureau,Nanchong 637000;Research and Innovation Team on Severe Weather Monitoring,Forecasting and Early Warning Technology,Nanchong 637000;Nanchong Key Laboratory of Strong Climate Research in Northeast Sichuan,Nanchong 637000)
出处
《气象水文海洋仪器》
2025年第6期34-37,共4页
Meteorological,Hydrological and Marine Instruments
基金
南充市科学技术局面上项目“南充市短时强降水监测预警系统研发”(22YYJCYJ0066)资助。
关键词
对流暴雨
中尺度系统
雷达回波
convective rainstorm
mesoscale system
radar echo
