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首页> 外文期刊>Journal of hydrometeorology >Evaluation of V05 Precipitation Estimates from GPM Constellation Radiometers Using KuPR as the Reference
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Evaluation of V05 Precipitation Estimates from GPM Constellation Radiometers Using KuPR as the Reference

机译:基于Kupr作为参考的GPM星座辐射仪的V05降水估计的评价

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This study assesses the level-2 precipitation estimates from 10 radiometers relative to Global Precipitation Measurement (GPM) Ku-band precipitation radar (KuPR) in two parts. First, nine sensors-four imagers [Advanced Microwave Scanning Radiometer 2 (AMSR2) and three Special Sensor Microwave Imager/Sounders (SSMISs)] and five sounders [Advanced Technology Microwave Sounder (ATMS) and four Microwave Humidity Sounders (MHSs)]-are evaluated over the 65 degrees S-65 degrees N region. Over ocean, imagers outperform sounders, primarily due to the usage of low-frequency channels. Furthermore, AMSR2 is clearly superior to SSMISs, likely due to the finer footprint size. Over land all sensors perform similarly except the noticeably worse performance from ATMS and SSMIS-F17. Second, we include the Sondeur Atmospherique du Profil d'Humidite Intertropicale par Radiometrie (SAPHIR) into the evaluation process, contrasting it against other sensors in the SAPHIR latitudes (30 degrees S-30 degrees N). SAPHIR has a slightly worse detection capability than other sounders over ocean but comparable detection performance to MHSs over land. The intensity estimates from SAPHIR show a larger normalized root-mean-square-error over both land and ocean, likely because only 183.3-GHz channels are available. Currently, imagers are preferred to sounders when level-2 estimates are incorporated into level-3 products. Our results suggest a sensor-specific priority order. Over ocean, this study indicates a priority order of AMSR2, SSMISs, MHSs and ATMS, and SAPHIR. Over land, SSMIS-F17, ATMS and SAPHIR should be given a lower priority than the other sensors.
机译:该研究评估了来自10个辐射测量(GPM)Ku带沉淀雷达(Kupr)的10个辐射计的水平-2降水估计。首先,九个传感器 - 四个成像器[高级微波扫描辐射计2(AMSR2)和三种特殊传感器微波成像/发声器(SSMISS)]和五个发声器[高级技术微波发声器(ATM)和四个微波湿度发声器(MHSS)] - 是在65摄氏度S-65度N区域评估。在海洋中,成像仪优于发声,主要是由于低频通道的使用。此外,AMSR2显然优于SSMISS,可能是由于较好的占地面积尺寸。除了从ATM和SSMIS-F17的明显更糟糕的性能之外,所有传感器都表现出类似的。其次,我们将Sondeur Atmospherique Du Profil D'Humidite intertropicale Par Radiometrie(Saphir)进入评估过程中,将其与Saphir纬度的其他传感器造影(30度S-30度N)。 Saphir的检测能力略微更差,而不是海洋上的其他发声器,但在土地上的MHSS有同样的检测性能。 Saphir的强度估计显示在土地和海洋上的较大标准化的根均线误差,可能是因为只有183.3 GHz频道可用。目前,当第2级估计被纳入第3级产品时,成像仪更倾向于发声器。我们的结果表明了特定于传感器的优先顺序。在海洋中,这项研究表明AMSR2,SSMISS,MHS和ATM和Saphir的优先顺序。在陆地上,SSMIS-F17,ATM和Saphir应优先于其他传感器。

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