Hydrology and Earth System Sciences Soil Moisture Active and Passive Microwave Products: Intercomparison and Evaluation over a Sahelian Site
Hydrology and Earth System Sciences Soil Moisture Active and Passive Microwave Products: Intercomparison and Evaluation over a Sahelian Site
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通讯作者：
C. Gruhier;P. de Rosnay;S. Hasenauer;T. Holmes;R. de Jeu;Y. Kerr;E. Mougin;E. Njoku;F. Tim
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作者：
C. Gruhier;P. de Rosnay;S. Hasenauer;T. Holmes;R. de Jeu;Y. Kerr;E. Mougin;E. Njoku;F. Tim
本文提出了一个比较和评价的五个土壤水分产品的基础上，基于卫星的被动和主动微波测量。根据在非洲季风多学科分析项目框架内部署在马里（萨赫勒）的土壤湿度网络获得的地面测量结果，对2005-2006年的产品进行了评价。结果表明，土壤水分产品的准确性是敏感的检索方法，以及传感器类型（有源或无源）和信号频率（从5.6 GHz到18.8 GHz）。在中尺度（14.5 · N - 17.5 · N和2 · W - 1 · W）下，比较了不同产品的表层土壤水分空间格局。不同的卫星土壤水分产品之间的一般良好的一致性显示在中尺度空间分布，特别是在对流性降雨发生。与地面测量结果的比较表明，虽然从卫星获得的土壤水分产品通常高估了土壤水分值在旱季，他们中的大多数捕捉土壤水分的时间变化与地面站测量结果吻合良好。
This paper presents a comparison and an evaluation of five soil moisture products based on satellite-based passive and active microwave measurements. Products are evaluated for 2005–2006 against ground measurements obtained from the soil moisture network deployed in Mali (Sa-hel) in the framework of the African Monsoon Multidisciplinary Analysis project. It is shown that the accuracy of the soil moisture products is sensitive to the retrieval approach as well as to the sensor type (active or passive) and to the signal frequency (from 5.6 GHz to 18.8 GHz). The spatial patterns of surface soil moisture are compared between the different products at meso-scale (14.5 • N – 17.5 • N and 2 • W – 1 • W). A general good consistency between the different satellite soil moisture products is shown in terms of meso-scale spatial distribution, in particular after convective rainfall occurrences. Comparison to ground measurement shows that although soil moisture products obtained from satellite generally overestimate soil moisture values during the dry season , most of them capture soil moisture temporal variations in good agreement with ground station measurements.