基于瓦片分区的雷达动态定量降水估测方法研究

  • 李佳慧 ,
  • 马建立 ,
  • 陈明轩 ,
  • 史朝
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  • 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

李佳慧(1997 -), 女, 四川乐山人, 硕士研究生, 主要从事雷达气象研究. E-mail:

收稿日期: 2023-12-27

  修回日期: 2024-04-02

  网络出版日期: 2024-04-02

基金资助

国家重点研发计划专项(2022YFC3003901)

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

  • Jiahui LI ,
  • Jianli MA ,
  • Mingxuan CHEN ,
  • Zhao SHI
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  • 1. Chengdu University of Information Technology,Chengdu 610225,Sichuan,China
    2. Institute of Urban Meteorology,Beijing 100089,China

Received date: 2023-12-27

  Revised date: 2024-04-02

  Online published: 2024-04-02

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。

本文引用格式

李佳慧 , 马建立 , 陈明轩 , 史朝 . 基于瓦片分区的雷达动态定量降水估测方法研究[J]. 高原气象, 2025 , 44(1) : 122 -133 . DOI: 10.7522/j.issn.1000-0534.2024.00052

Abstract

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.

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