张哲,戚友存. 2021. 深圳S波段与X波段双偏振雷达在定量降水估计中的应用[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.042
深圳S波段与X波段双偏振雷达在定量降水估计中的应用
On the application of radar quantitative precipitation evaluation using S-band and X-band polarimetric radars in Shenzhen
投稿时间:2021-02-24  修订日期:2021-04-07
DOI:10.11676/qxxb2021.042
中文关键词:  双偏振雷达,定量降水估计,雨滴谱
英文关键词:Polarimetric radar, Quantitative precipitation estimation(QPE), Raindrop size distribution
基金项目:国家重点研发计划项目(2018YFC1507505)、中国科学院A类战略性先导科技专项(XDA2006040101)和中国科学院百人计划
作者单位邮编
张哲 中国科学院地理科学与资源研究所 100101
戚友存 中国科学院地理科学与资源研究所 100101
摘要点击次数: 295
全文下载次数: 261
中文摘要:
      [目的]双偏振多普勒天气雷达的一个重要作用是进行定量降水估计(QPE),它可以获得反射率(ZH)、差分反射率(ZDR)和差传播相移率(Kdp)这些与降水粒子有关的信息,常用的双偏振雷达降水估计方法有基于ZH的R(ZH)、基于ZH和ZDR的R(ZH, ZDR)、基于Kdp的R(Kdp)和基于Kdp和ZDR的R(Kdp, ZDR)这四种。[资料和方法]本文利用深圳市S波段和X波段双偏振多普勒雷达观测资料,结合高精度地形数据和雨滴谱仪数据,设计了基于双偏振量的QPE方法:首先利用地形数据和雷达地理信息,分析了雷达的遮挡状况,形成了这两台雷达的复合平面扫描仰角信息;随后利用雨滴谱仪,使用T矩阵方法统计得到了深圳地区的上述四种降水反演方法的参数;最后设计了混合降水反演方法,基于双偏振信号(即Kdp和ZDR)的强弱,使用不同的降水反演方法进行QPE。基于12个降水个例,利用各反演方法产生的QPE结果与雨量计观测比较,[结果]结果表明,混合降水反演方法在降水反演的准确性和稳定性上,均优于任何一种单一QPE反演方法产生的结果。[结果]基于本文的QPE方法,使用深圳S波段和X波段雷达产生了QPE产品,并与深圳目前业务QPE产品进行比较评估。结果表明,使用本文方法产生的QPE产品,在准确性和稳定性上要优于目前业务产品。[结果]此外,X波段雷达的QPE产品性能要略高于S波段雷达的QPE产品,[结论]这说明高时空分辨率的X波段雷达可以提高QPE降水估计精度。
英文摘要:
      One of the important usages of polarimetric Doppler weather radar is quantitative precipitation evaluation. Polarimetric radar detects reflectivity (ZH), differential reflectivity (ZDR) and specific differential phase (Kdp), which are closely related to the precipitation particles. The commonly used QPE estimators include ZH-based R(ZH), ZH -ZDR-based R(ZH, ZDR), Kdp-based R(Kdp) and Kdp -ZDR-based R(Kdp, ZDR). Based on the observation data of Shenzhen S-band and X-band polarimetric radars, as well as the high-resolution elevation data and the disdrometer data, the QPE method based on polarimetric variables is presented: first, the blockage information of these 2 radars is analyzed, and the hybrid tilts of these 2 radars are generated based on the elevation data and location data of the radars; then the parameters for the above 4 QPE estimators suitable for Shenzhen are calculated with disdrometer observation with T-matrix method; finally, the blended method of QPE is designed to use different QPE estimators based on the intensity of polarimetric signals (i.e. Kdp and ZDR). The performance of the blended method is evaluated with rain gauge observation using 12 test cases. Results suggests the accuracy and the stability of the blended method outperforms any of the single estimator methods. The QPE products of Shenzhen S-band and X-band radars are generated with the QPE method presented in this paper, and their performances are evaluated against the operational QPE product. Results suggest the QPE products generated using QPE method presented in this paper outperform operational product both in accuracy and stability. Besides, the performance of X-band radar is slightly better than S-band radar, suggesting the utilization of high-resolution X-band radar can improve the accuracy of QPE.
查看全文   查看/发表评论  下载PDF阅读器
分享按钮