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Multiple scattering in observations of the GPM dual‐frequency precipitation radar: Evidence and impact on retrievals

机译:GPM双频降水雷达观测中的多重散射:证据和对取回的影响

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摘要

This paper illustrates how multiple scattering signatures affect Global Precipitation Measuring (GPM) Mission Dual‐Frequency Precipitation Radar (DPR) Ku and Ka band reflectivity measurements and how they are consistent with prelaunch assessments based on theoretical considerations and confirmed by airborne observations. In particular, in the presence of deep convection, certain characteristics of the dual‐wavelength reflectivity profiles cannot be explained with single scattering, whereas they are readily explained by multiple‐scattering theory. Examples of such signatures are the absence of surface reflectivity peaks and anomalously small reflectivity slopes in the lower troposphere. These findings are relevant for DPR‐based rainfall retrievals and stratiform/convective classification algorithms when dealing with deep convective regions. A path to refining the rainfall inversion problem is proposed by adopting a methodology based on a forward operator which accounts for multiple scattering. A retrieval algorithm based on this methodology is applied to a case study over Africa, and it is compared to the standard DPR products obtained with the at‐launch version of the standard algorithms.
机译:本文说明了多个散射特征如何影响全球降水测量(GPM)任务双频降水雷达(DPR)的Ku和Ka波段反射率测量,以及它们如何与基于理论考虑并经机载观测证实的发射前评估相一致。特别是在深对流的情况下,无法用单次散射来解释双波长反射率曲线的某些特征,而用多次散射理论则可以很容易地解释它们。这种特征的例子是在低对流层中没有表面反射率峰值和反常的小反射率斜率。这些发现与处理深对流区域时基于DPR的降雨反演和层状/对流分类算法有关。通过采用基于前向算子的方法,提出了解决降雨反演问题的途径,该方法考虑了多次散射。基于此方法的检索算法应用于非洲的案例研究,并将其与使用标准算法的发布版本获得的标准DPR产品进行比较。

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