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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Soil Moisture Information Content in SMOS, SMAP, AMSR2, and ASCAT Level-1 Data Over Selected In Situ Sites
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Soil Moisture Information Content in SMOS, SMAP, AMSR2, and ASCAT Level-1 Data Over Selected In Situ Sites

机译:SMOS,SMAP,AMSR2和ASCAT等级-1的土壤湿度信息内容在原位站点中选择

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摘要

Microwave brightness temperature (Tb) and backscatter (sigma(0)) observations from the Soil Moisture and Ocean Salinity (SMOS) mission, Soil Moisture Active Passive (SMAP) mission, Advanced Microwave Scanning Radiometer 2 (AMSR2) instrument, and Advanced Scatterometer (ASCAT) instrument provide a wealth of operationally available satellite data for soil moisture retrieval and data assimilation purposes. To assist the synergistic and efficient use of such techniques, the soil moisture information content in the respective Level-1 observations needs to be determined. Within this context, we compare L-, C-, and X-band Tb and sigma(0) signatures of the above-named sensors to in situ SM observations in Spain, Australia, and USA. We find that L-band Tb observations from SMOS and SMAP show the best overall performance given the considered diagnostics (correlation, anomaly correlation, and sensitivity), while all sensors provide significant soil moisture information. This finding is consistent across the analyzed incidence angle range for SMOS (25 degrees-60 degrees). The results are discussed with respect to physical processes governing the dynamics of Tb and sigma(0), noting dependencies on vegetation seasonality and land surface temperature.
机译:微波亮度温度(TB)和反向散射(Sigma(0))从土壤水分和海洋盐度(SMOS)任务,土壤湿度活性(SMAP)任务,先进的微波扫描辐射计2(AMSR2)仪器和先进散射仪( ASCAT)仪器提供了丰富的土壤湿度检索和数据同化目的的可操作可用的卫星数据。为了协助协同和有效地利用这种技术,需要确定各级-1观察中的土壤水分信息含量。在这种情况下,我们将上述传感器的L-,C-BAND和X波段TB和SIGMA(0)签名进行比较到西班牙,澳大利亚和美国的原位SM观察。我们发现来自SMOS和SMAP的L频段TB观察显示了鉴于所考虑的诊断(相关性,异常相关性和灵敏度),展示了最佳整体性能,而所有传感器都提供了显着的土壤水分信息。这种发现在分析的SMOS(25度-60度)的分析发射角度范围内是一致的。结果讨论了针对TB和Sigma(0)的动态的物理过程,注意到植被季节性和陆地温度的依赖性。

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