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Validation of SMOS soil moisture production in the Heihe River Basin of China

机译：黑河流域SMOS土壤水分生产的验证。

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摘要

Soil moisture is a critical factor in cosmopolitan meteorological and hydrological processes. Microwave remote sensing brightness temperature is sensitive to soil moisture through the effects of moisture on the dielectric constant and hence emissivity of the soil [1]. It was found that the brightness temperature at L-band is useful for retrieving near-surface soil moisture [2-3]. The Soil Moisture and Ocean Salinity (SMOS) satellite, which carries an L-band passive microwave radiometer in the 1400-1427 MHz protected band, was successfully launched in November 2, 2009 and it has become a useful tool monitoring soil moisture [4-5]. However, it is very important to assess the performance of soil moisture product before using it and the validation is still a challenging task to validate these soil moisture retrievals due to the coarse spatial resolution of passive microwave remote sensing [6]. During the past few years, the SMOS soil moisture products have been evaluated over several areas of the world, e.g., Europe [7-8], North America [9] and Oceania [10]. But the evaluations were limited in the Tibet area in China [8,11]. More assessments need to be performed in other areas of China.
机译：土壤水分是世界性气象和水文过程中的关键因素。微波遥感亮度温度通过水分对介电常数和土壤发射率的影响而对土壤水分敏感[1]。已经发现，L波段的亮度温度对于恢复近地表土壤水分是有用的[2-3]。土壤水分和海洋盐度（SMOS）卫星于2009年11月2日成功发射，其L波段无源微波辐射计在1400-1427 MHz保护频带内发射，已成为监测土壤湿度的有用工具[4- 5]。但是，在使用前评估土壤水分产品的性能非常重要，由于无源微波遥感的空间分辨率较粗糙，验证仍然是一项艰巨的任务，以验证这些土壤水分的恢复情况。在过去的几年中，已经在世界几个地区对SMOS土壤水分产品进行了评估，例如，欧洲[7-8]，北美[9]和大洋洲[10]。但是，在中国西藏地区的评估是有限的[8,11]。需要在中国其他地区进行更多评估。

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