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首页> 外文期刊>Journal of hydrometeorology >A Multiyear Analysis of Global Precipitation Combining CloudSat and GPM Precipitation Retrievals
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A Multiyear Analysis of Global Precipitation Combining CloudSat and GPM Precipitation Retrievals

机译：Cloudsat和GPM降水检索全球降水的多年分析

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Satellite-based instruments are essential to the observation of precipitation at a global scale, especially over remote regions. Each instrument has its own strengths and limitations in accurately determining the rate of precipitation at the surface. By using the complementary strengths of two instruments, a more complete analysis of global precipitation can be performed. The Global Precipitation Measurement (GPM) Core Observatory's Dual-Frequency Precipitation Radar (DPR) is capable of measuring precipitation at high and medium precipitation rates by using Ku-band (13.6 GHz) radiation. The CloudSat satellite's Cloud Profiling Radar (CPR) uses higher-frequency W-band (94 GHz) radiation and is therefore capable of measuring precipitation at low rates not detected by the GPM DPR. CloudSat observations from January 2007 to December 2016 and DPR observations from March 2014 to February 2018 are combined and the results examined. Since these datasets are not completely coincident, this study is conducted as a multiyear analysis. Observed precipitation from CloudSat is used starting at the lowest precipitation rates and increasing rates until the occurrence observed by GPM surpasses that of CloudSat, at which point data from GPM are used. The precipitation rate at which this change occurs contains important information on the amount of precipitation missed by each instrument and implications as to the size of the hydrometeors present. Liquid precipitation retrieval from CloudSat is not performed over land; analysis over land is produced here using the information available. By combining the two datasets, a more complete picture of precipitation occurring globally is obtained.
机译：基于卫星的仪器对于在全球范围内降水的观察至关重要，特别是在偏远地区。每种仪器都有自己的优点和限制，准确地确定表面的沉淀速率。通过使用两种仪器的互补优势，可以进行更完全的全局降水分析。全局降水测量（GPM）核心天文台的双频降水雷达（DPR）能够通过使用Ku波段（13.6GHz）辐射来测量高中沉淀速率的沉淀。 CloudSat卫星的云分析雷达（CPR）使用更高频率的W波段（94GHz）辐射，因此能够以GPM DPR未检测到的低速率测量沉淀。 2016年1月至2016年12月至2016年12月至2018年3月至2018年2月的DPR观察的Cloudsat观察将合并，并审查结果。由于这些数据集没有完全一致，因此该研究是为多年分析进行的。从CloudSAT的观察到从最低沉淀速率开始使用的沉淀，并增加速率，直到GPM观察到的发生率超过CloudSAT的发生，在该GPM的点数据上使用来自GPM的点数据。这种变化发生的降水率包含关于每个仪器错过的降水量的重要信息，并对存在的水质仪的大小的影响。液体降水从陆地上进行液体降水检索;使用可用的信息，在此分析土地进行。通过组合两个数据集，获得全球发生的降水图像。

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