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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Calculation of microwave land surface emissivity from satellite observations: validity of the specular approximation over snow-free surfaces?
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Calculation of microwave land surface emissivity from satellite observations: validity of the specular approximation over snow-free surfaces?

机译：通过卫星观测计算微波陆地表面发射率：在无雪表面上的镜面反射近似有效吗？

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摘要

To determine land surface emissivity from satellite microwave measurements, the surface is usually assumed to be specular. Questions about the validity of this approximation to estimate emissivity from nadir viewing radiometers were raised. This work aims to examine the validity of the specular assumption by evaluating errors induced when deriving emissivities from near-nadir measurements over snow-free areas. Brightness temperature simulations near nadir above both a specular and a Lambertian surface are compared. Errors on the retrieved emissivity introduced by the specular assumption are also quantified. The results show that the impact of the specular assumption when the surface is Lambertian is limited: less than 1% error in most atmospheric situations over natural snow-free surfaces.
机译：为了通过卫星微波测量确定陆地表面发射率，通常假定该表面是镜面反射的。有人提出了这种近似法从天底观测辐射计估算发射率的有效性的问题。这项工作旨在通过评估在无雪地区从近天底测量得出的发射率时引起的误差，来评估镜面反射假设的有效性。比较了镜面和朗伯表面上方最低点附近的亮度温度模拟。由镜面反射假设引入的所获得的发射率的误差也被量化。结果表明，当表面为朗伯型时，镜面反射假设的影响是有限的：在大多数无自然雪表面的大气条件下，误差小于1％。

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