气象研究与应用2025，Vol.46Issue(1)：28-34,7.DOI:10.19849/j.cnki.CN45-1356/P.2025.1.04
基于雷达比衰减的定量降水估计算法对比分析
Comparative analysis of radar specific attenuation-based algorithms for quantitative precipitation estimation
摘要
Abstract
This study focuses on the key technology of quantitative precipitation estimation.Aiming at the limitations of the traditional reflectivity factor method R(Z)in extreme precipitation events,a precipitation estimation algorithm based on specific attenuation A is introduced.Taking an extreme precipitation event in Qinzhou City,Guangxi,on May 19,2024 as a case,S-band dual-polarization radar data are used to compare the R(A)method with the conventional R(Z)approach.The results indicate that:(1)the traditional R(Z)relationship Z=300R1.4 underestimates heavy rainfall,while the tropical Z-R relation Z=250R1.2 can capture large-scale precipitation,but overestimates the precipitation intensity and fails to capture localized features.(2)The R(A)method significantly reduces sensitivity to droplet size distribution variations by dynamically calculating the specific attenuation A with the highest agreement between the estimation results and the data from the rain gauge,and can accurately resolve the spatial structure of precipitation.The anti-attenuation and low calibration dependence characteristics of R(A)enhance the accuracy of heavy rainfall monitoring,providing insights for operational applications of dual-polarization radar.关键词
定量降水估计/比衰减/Z-R关系Key words
quantitative precipitation estimation/specific attenuation/Z-R relationship分类
大气科学引用本文复制引用
魏佳奇,陈生,李峙,李艳萍,韦春霞,韩宇龙,苏明月..基于雷达比衰减的定量降水估计算法对比分析[J].气象研究与应用,2025,46(1):28-34,7.基金项目
广西重点研发项目(AB22080104、AB22035016)、甘肃省自然科学基金项目(24JRRA082)、柳州市元宝山地形暴雨重点实验室重点项目(2024ybssysz2)、中国科学院高层次人才计划项目(E2290702)、浙江省自然科学基金联合基金资助项目(LZJMY25D050008)、宁波市公益性研究计划项目(2023S065)、江苏省气象局指导性科研项目(ZD202404) （AB22080104、AB22035016）
