济宁S波段双线偏振多普勒雷达数据质量分析
作者:
作者单位:

作者简介:

通讯作者:

张玉洁,女,硕士,正高级工程师,主要从事探测资料应用研究,yjzhyw@163.com

中图分类号:

P412.25

基金项目:

山东省气象局科研项目(2021SDYD11,2018sdqxz05)


请扫码阅读

Data quality analysis of S-band dual-linear polarization Doppler radar in Jining
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    以济宁S波段双线偏振多普勒雷达观测的层状云降水资料为例,分析了信噪比(signal-to-noise ratio,SNR)、相关系数(ρhv)对偏振参量的影响以及近距离双偏振参数的特征。利用雷达最高扫描仰角的层状云降水资料,对小雨和干雪两种自然目标物差分反射率因子(ZDR)的订正效果进行分析。研究表明:(1)SNR小于21 dB时,ZDR、ρhv、差分传播相位偏差(ΔΦDP)的平均值和标准差随SNR的变化波动明显,ZDR、ρhv、差分传播相位DP)不稳定,数据质量差。SNR大于21 dB时,ZDR、ρhv、ΦDP才具有可信度,且随着SNR的增大,ZDR、ρhv、ΦDP的稳定性越来越好。(2)SNR大于21 dB、ρhv<0.965时,ΔΦDP的平均值和标准差随ρhv的变化而波动剧烈;SNR大于21 dB、ρhv>0.965时,ρhv越大,ΦDP的值越稳定。(3)受地面噪声干扰、近距离地物以及天线旁瓣的影响,0~15 km的近距离偏振参数不稳定,数据质量差,业务应用中需特别注意。(4)利用小雨和干雪两种自然目标物对ZDR系统误差进行标定,通过对比发现,小雨粒子的ZDR系统误差的平均值和标准差比干雪粒子小很多,且小雨粒子ZDR系统误差订正曲线比干雪粒子稳定;小雨粒子相比于干雪粒子,其ZDR系统误差订正效果更稳定;经过系统误差订正后的降水粒子的ZDR值较订正前更加合理。

    Abstract:

    The effects of signal-to-noise ratio (SNR) and correlation coefficient hv) on polarization parameters and characteristics of short-range dual-polarization parameters are analyzed based on the stratiform precipitation data observed by the S-band dual-linear polarization Doppler radar in Jining. The correction results of the differential reflectivity (ZDR) for light rain and dry snow are analyzed by using the stratiform precipitation data of the highest scanning elevation of radar. The results are listed as follows. (1) When SNR is less than 21 dB, the mean values and standard deviations of ZDR, ρhv, and ΔΦDP fluctuate obviously with the change of SNR, ZDR, ρhv, and differential propagation phase DP) are unstable, and the data quality is poor. When SNR is higher than 21 dB, ZDR, ρhv, and ΦDP are reliable, and with the increase of SNR, the stability of ZDR, ρhv, and ΦDP data becomes better and better. (2) When SNR is higher than 21 dB and ρhv is less than 0.965, the mean value and standard deviation of ΔΦDP fluctuate sharply with the change of ρhv; when SNR is higher than 21 dB and ρhv is higher than 0.965, the greater the ρhv, the more stable the DP) (3) Due to the interference of ground noise, ground objects in short range, and antenna sidelobe, the polarization parameters in short range of 0-15 km are unstable and the data quality is poor. Therefore, data with low elevation in short range should be noticed in business applications. (4) By using light rain and dry snow as two natural objects to calibrate the systematic errors of ZDR, it is found that the mean value and standard deviation of ZDR errors of light rain particles are much smaller than those of dry snow particles, and the correction curve of ZDR errors of light rain particles is more stable than that of dry snow particles. Compared with dry snow particles, the correction effect of ZDR errors of light rain particles is more stable. The ZDR values of precipitation particles after systematic error correction are more reasonable.

    参考文献
    相似文献
    引证文献
引用本文

张玉洁,李恒昶,涂爱琴.济宁S波段双线偏振多普勒雷达数据质量分析[J].海洋气象学报,2023,43(1):107-116.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
文章历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2023-03-11
  • 出版日期: 2022-02-28
关闭

“星载风场探测技术专题”征稿通知

关闭