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首页> 外文期刊>Geophysical Research Letters >Using spaceborne surface soil moisture to constrain satellite precipitation estimates over West Africa
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Using spaceborne surface soil moisture to constrain satellite precipitation estimates over West Africa

机译：利用空间表层土壤水分限制西非的卫星降水估计

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摘要

This paper describes a methodology to use the passive microwave measurements of the 6.9 GHz bandwidth of the AMSR-E sensor which is the most sensitive to surface soil moisture, to constrain satellite-based rainfall estimates over a semi arid region in West-Africa. The paper focuses on the aptitude of AMSR-E measurements to inform if rain occurs or not. The study was conducted over a 125 x 100 km(2) region located in Niger where a dense recording raingauge network is available to build an accurate ground-based 3-hour rainfall product at the 25 x 20 km(2) resolution. A satellite-based rainfall product (EPSAT-SG), based on both infrared and microwave measurements, was compared to the ground-based rainfall product. It was shown that EPSAT-SG overestimates by about 30% the total number of rain events during the 2004 and 2006 rainy seasons. A simple methodology based on the AMSR-E polarization ratio variations related to the surface soil moisture leaded to suppress a large amount of the wrong rain events.
机译：本文介绍了一种方法，该方法使用对表面土壤水分最敏感的AMSR-E传感器的6.9 GHz带宽的无源微波测量值，来约束西非半干旱地区基于卫星的降雨量估算。本文着重于AMSR-E测量的适用性，以告知是否下雨。这项研究是在尼日尔的125 x 100 km（2）区域上进行的，那里有密集的记录雨量计网络可用于以25 x 20 km（2）的分辨率构建精确的地面3小时降雨产品。将基于红外和微波测量的卫星雨量产品（EPSAT-SG）与地面雨量产品进行了比较。结果表明，EPSAT-SG高估了2004年和2006年雨季降雨事件总数的30％。一种基于AMSR-E极化比变化的简单方法，该方法与地表土壤湿度有关，可以抑制大量错误的降雨事件。

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