机载KA波段降雨雷达探测精度的变化特征分析
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1.中国气象局气候资源经济转化重点开放实验室;2.渝东南强天气研究黔江区重点实验室;3.山西省气象灾害防御技术中心;4.中国气象局人工影响天气中心;5.山东省人民政府人工影响天气办公室

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国家重点研发计划(2019YFC1510301);国家自然科学基金项目(42175099)


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Change Characteristics of Detection Accuracy of Airborne KA Band Precipitation Radar (KPR)
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Affiliation:

1.CMA Key Open Laboratory of Transforming Climate Resources to Economy;2.Qianjiang District Key Laboratory of Strong Weather Research in Southeast Chongqing;3.Meteorological Disasters Defense Technology Center;4.CMA Weather Modification Centre;5.Shandong Weather Modification Office

Fund Project:

National Key R&D Program of China (2019YFC1510301);National Natural Science Foundation of China (42175099)

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    摘要:

    本文利用2019年11月17日一次层状云系弱降水过程中获取的机载KA波段降雨雷达(Ka-Band Precipitation Radar, KPR) 和云粒子测量系统(Droplet Measurement Technologies,DMT)资料,将利用云粒子谱正演得到的雷达反射率因子与机载KPR云雷达探测结果进行了对比,并对影响两者误差的成因进行了探讨分析。结果发现:(1)在层状云内部,根据云粒子谱正演得到反射率因子结果(dBZC)与KPR实测结果(dBZM)有很好的一致性,两者之间的相对误差均值和均方根分别为4.1dBZ和4.3dBZ。(2)在KPR云雷达径向速度变化和速度谱宽较大的区域,或在云层比较薄的区域,dBZC与dBZM吻合得不够好,但有较好的一致性。(3)云粒子数浓度Nc、云粒子有效直径ED和云中液态水含量LWC的变化均对dBZC与dBZM的误差有一定的影响,但误差值总体控制在±10dBZ范围内。随着Nc的增加,两者的相对误差变小,大于200cm-3的误差大于10dBZ的时次极少;有效直径在50~230μm和液态水含量在0.15~0.5g/m3范围内,计算值低于探测值,有效直径大于230μm和液态水含量大于0.5g/m3的计算值高于探测值。

    Abstract:

    Based on airborne Ka-Band Precipitation Radar (KPR) and Droplet Measurement Technologies (DMT) data obtained during a weak stratiform cloud precipitation system on November 17, 2019, we calculated the radar reflectivity with the detected cloud particle spectrum, compared it with the KPR observation, and discussed the error mechanism. Results are as follows. (1) Inside the stratiform cloud, the calculated reflectance factor (DBZC) and the KPR measured value (DBZM)are in good agreement, with a mean relative error and root-mean-square error of 4.1 dBZ and 4.3dBZ, respectively. (2) In areas where KRP detected radial velocity changes and velocity spectral width are large, or in thin clouds, DBZC and DBZM are in good consistency despite their poor-fit relatively. (3) The error between DBZC and DBZM is affected by the changes in cloud particle number concentration (Nc), cloud particle effective diameter (ED), and liquid water content (LWC) in the cloud. However, the error value is generally controlled within the range of ± 10 dBZ. The relative error decreases with increasing Nc, with precious few errors greater than 10dBZ when Nc is greater than 200cm-3. The calculated value is smaller than the KPR observation in condition with ED between 50~230 μm and the LWC between 0.15~0.5g/m3. On the contrary, the calculated value is larger than is observation as ED bigger than 230 μm and the LWC higher than 0.5g/m3.

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  • 收稿日期:2023-11-04
  • 最后修改日期:2024-03-02
  • 录用日期:2024-05-29
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