Improved Satellite Estimation of Near‐Surface Humidity Using Vertical Water Vapor Profile Information
Improved Satellite Estimation of Near‐Surface Humidity Using Vertical Water Vapor Profile Information
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DOI：
10.1002/2017gl076384
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发表时间：
2018-01
影响因子：
5.2
通讯作者：
H. Tomita;T. Hihara;M. Kubota
中科院分区：
文献类型：
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作者：
H. Tomita;T. Hihara;M. Kubota
近地表空气比湿度是估算海-气潜热通量和海洋表面蒸发的一个关键变量。对全球气候、海气相互作用和水循环的研究需要对全球海洋的准确估计。目前的遥感技术存在问题，是通量和蒸发量误差的主要来源。本文提出了一种利用卫星微波辐射计估算地表湿度的新方法，该方法基于卫星传感器测量的多通道亮温与地表湿度和垂直水分结构之间的关系的新发现。将新方法的卫星估算结果与现场观测结果进行了比较，结果表明，该方法对卫星估算的潜热通量影响较大，能显著改善卫星估算的潜热通量。我们建议在任何卫星微波辐射计观测中采用这种方法。
Near‐surface air‐specific humidity is a key variable in the estimation of air‐sea latent heat flux and evaporation from the ocean surface. An accurate estimation over the global ocean is required for studies on global climate, air‐sea interactions, and water cycles. Current remote sensing techniques are problematic and a major source of errors for flux and evaporation. Here we propose a new method to estimate surface humidity using satellite microwave radiometer instruments, based on a new finding about the relationship between multichannel brightness temperatures measured by satellite sensors, surface humidity, and vertical moisture structure. Satellite estimations using the new method were compared with in situ observations to evaluate this method, confirming that it could significantly improve satellite estimations with high impact on satellite estimation of latent heat flux. We recommend the adoption of this method for any satellite microwave radiometer observations.