高原气象

高原气象 >

2016 , Vol. 35 >Issue 1: 231 - 243

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00131

论文

C波段偏振雷达数据预处理及在降水估计中的应用

  • 魏庆 ,
  • 胡志群 ,
  • 刘黎平 ,
  • 吴林林
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  • 中国气象科学研究院灾害天气国家重点实验室, 北京 100081;2. 四川省防雷中心, 成都 610072;3. 安徽省人工影响天气办公室, 合肥 230031

收稿日期: 2014-05-05

  网络出版日期: 2016-02-28

基金资助

公益性行业(气象)科研专项(GYHY201306040,GYHY201306075);973计划项目(2012CB417202);国家自然科学基金项目(41375038)

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C-Band Polarization Radar Data Preprocessing and Its Application to Rainfall Estimation

  • WEI Qing ,
  • HU Zhiqun ,
  • LIU Liping ,
  • WU Linlin
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  • State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;2. Chengdu University of Information Technology, Chengdu 610225, China;3. Anhui Weather Modification Office, Hefei 230031, China

Received date: 2014-05-05

  Online published: 2016-02-28

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摘要

利用移动式C波段双线偏振雷达(PCDJ)观测资料,对安徽定远2013年6-7月3次降水过程进行数据处理方法和降水估计效果的分析,提出了优化的C波段双偏振雷达数据处理方案,在优化的R(ZH)关系条件下,分析了降水估测的效果。对比分析中值滤波和小波分析方法对差传播相移ΦDP数据处理的效果,发现小波分析方法对ΦDP数据处理具有明显的改善作用;采用变距离法对小波分析处理后的ΦDP数据进行拟合得到的KDP,数据的连续性和平滑度较好,且应用于降水估计的精度更高;利用较好的数据处理方法(小波分析)拟合得到的KDP对水平反射率因子ZH进行雨区衰减校正;以及利用SA雷达与PCDJ雷达衰减校正后的数据进行对比观测,表明PCDJ雷达回波强度比SA雷达偏弱。对两部雷达进行定量降水估计,并与地面雨量计小时降水量资料进行对比分析,结果表明:当降水强度>5 mm·h-1时,PCDJ雷达利用R(ZH,KDP)关系估测降水的精度比R(ZH)关系高,当降水强度<5 mm·h-1时,则相反;SA雷达与PCDJ雷达均基于反射率因子估测降水,SA雷达的效果更好;但在降水强度>5 mm·h-1时,PCDJ雷达基于R(ZH,KDP)关系估测降水较SA雷达基于R(Z)关系方法具有更明显的优势。

关键词： C波段双偏振雷达; 优化数据; 差传播相移率; 降水估计

本文引用格式

魏庆 , 胡志群 , 刘黎平 , 吴林林 . C波段偏振雷达数据预处理及在降水估计中的应用[J]. 高原气象, 2016 , 35(1) : 231 -243 . DOI: 10.7522/j.issn.1000-0534.2014.00131

Abstract

Radar data processing method and qualitative precipitation estimation are tested based on the data observed at Dingyuan,Anhui Province in June and July 2013 with a C-band polarization radar(PCDJ) which is one of the instrument of Anhui Weather Modification Office.After filtered by median filter and wavelet analysis method respectively,the differential propagation phase shift ΦDP data filtered by wavelet analysis can significantly improve ΦDP data quality.The specific differential propagation phase shift KDP is estimated from ΦDP by least-square fitting approaches in 1.5~4.0 km resolution.ΦDP data filtered by wavelet analysis is more continuous and smooth.And the result of ΦDP data filtered by wavelet analysis applied to precipitation estimation is better.The attenuation of ZH in rain area is corrected by KDP which is estimated from ΦDP data filtered by wavelet analysis,and the corrected ZH values of PCDJ radar are smaller than SA's.Combining with hourly rainfall gauge,the comparison analysis were made between the rain rates estimated from PCDJ and SA.The results suggest that the rain rates estimated from i>R(ZH,KDP) are more accurate than those from i>R(ZH) when the rain rates are greater than 5 mm·h-1,but less accurate when the rain rates are smaller than 5 mm·h-1.In addition,SA radar rain rates estimated from i>R(ZH) is more accurate than PCDJ radar's.Also,PCDJ radar rain rates estimated from i>R(ZH,KDP) can further improve the accuracy than SA radar when the rain rates are greater than 5 mm·h-1.

Key words： C-band polarization; Data optimization; Specific differentia; Rainfall estimation

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