基于瓦片分区的雷达动态定量降水估测方法研究  

Research on Dynamic Quantitative Precipitation Estimation Method Based on Tile Partitioning for Radar

作　　者：李佳慧 马建立 陈明轩 史朝[1] LI Jiahui;MA Jianli;CHEN Mingxuan;SHI Zhao(Chengdu University of Information Technology,Chengdu 610225,Sichuan,China;Institute of Urban Meteorology,Beijing 100089,China)

机构地区：[1]成都信息工程大学,四川成都610225 [2]北京城市气象研究院,北京100089

出　　处：《高原气象》2025年第1期122-133,共12页Plateau Meteorology

基　　金：国家重点研发计划专项(2022YFC3003901)。

摘　　要：雷达定量降水估测(QPE)考虑雨滴谱的时空变异性,是提高QPE的有效途径。雷达采用Z-R关系开展降水估测时,雨滴谱的差异,主要表现为Z-R关系式不同;利用瓦片分区方法,将降水估测区域进行瓦片分区,每个瓦片内利用雷达和自动站数据动态拟合Z-R关系式开展QPE。文中利用六次天气过程对瓦片分区降水估测方法进行评估,从QPE各项评价指标看,误差较传统的固定Z-R关系法和全域动态Z-R关系法,有很好的提升,降水估测结果与强降水中心基本一致,各项误差指标均最小;结果表明瓦片分区降水估测方法是提升雷达QPE的有效方式。Considering the spatiotemporal variability of raindrop spectra is an effective way to improve radar quantitative precipitation estimation(QPE).When using radar to estimate precipitation,the difference of raindrop spectrum is mainly manifested by the formulas of Z-R relation.Using the method of tile partitioning QPE(QPE_TP),the precipitation estimation area is divided into tile partitions,the Z-R relationship is dynamically fitted using radar and automatic station data to carry out QPE within each tile.The QPE_TP effect was evaluated by utilizing six weather cases.From the evaluation indexes of QPE,the capability of QPE is significantly improved compared with the traditional fixed Z-R relationship and the global dynamic Z-R relationship.The QPE results are basically consistent with the heavy precipitation center,and the bias evaluation indexes are the least.The results show that the QPE_TP method is an effective way to improve radar QPE.

关 键 词：降水估测 雷达组网 分区拟合 

分 类 号：P412.25[天文地球—大气科学及气象学]