基于X波段相控阵双偏振雷达的短时强降水分析  

Analysis of Short-term Heavy Precipitation Process Based on X-band Phased Array Dual-Polarization Radar

作　　者：施娟 陈翼 刘立兵 夏昕 SHI Juan;CHEN Yi;LIU Libing;XIA Xin(Chengdu Meteorological Service,Chengdu 610000,China)

机构地区：[1]四川省成都市气象局,成都610000

出　　处：《高原山地气象研究》2025年第1期105-112,共8页Plateau and Mountain Meteorology Research

基　　金：高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(SCQXKJZD202103);成都市气象局科技课题(2024-9)。

摘　　要：选取成都地区X波段相控阵双偏振天气雷达和地面观测资料,在对比分析2021年成都三次短时强降水过程的基础上,应用ZH参量建立了短时强降水事件临近预警指标,初步探究了该指标在短时强降水预报预警方面的可用性。结果表明:(1)三次降水过程都存在明显的低质心回波结构,雨强越大对应融化层上方回波越强,其Z_(DR)强度更大,正值Z_(DR)可达到的高度也越高(接近融化层);(2)强降水前1小时内其上空对应的回波最大值超过47 dBZ,可作为本地短时强降水事件的预警阈值,能在一定程度上提前预报短时强降水的发生,对于成都地区短时强降水的短临预报预警具有指导意义。Using X-band phased array dual-polarization weather radar data and ground observation data,three short-term heavy precipitation processes in Chengdu were analyzed.The ZH parameter was used to establish a short-term heavy precipitation event warning index,and the availability of this index in short-term heavy precipitation forecasting and early warning was preliminarily explored.The results show that:(1)There were obvious low-center-of-mass echo structures in the three precipitation processes,and the greater the rainfall intensity was,the stronger the echo above the melting layer was,the greater the Z_(DR) intensity was,and the higher the positive Z_(DR) could reach(close to the melting layer).(2)The maximum value of the echo above the strong precipitation is more than 47 dBZ within 1 hour before the strong precipitation,which can be used as the early warning threshold of the local short-term heavy precipitation event,and can predict the occurrence of short-term heavy precipitation in advance to a certain extent.It has guiding significance for the short-term and imminent forecast and early warning of short-term heavy precipitation in Chengdu.

关 键 词：X波段相控阵雷达 双偏振 短时强降水 

分 类 号：P415.2[天文地球—大气科学及气象学] P458.121.1