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A modified model for specular sea surface emissivity at microwave frequencies

机译：微波频率下镜面海面发射率的改进模型

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摘要

Modifications to the L.A. Klein et al. model (1997) for specular ocean emissivity have recently been suggested by W.J. Ellison et al. (1996) in order to improve the performance at high microwave frequencies. The work presented in the present article tests both the original and modified models using a set of satellite and ground-based observations that is designed to eliminate as much as possible the dependence of the test on parameters other than the surface emission itself. Clear sky, low humidity, and low wind conditions were used exclusively to reduce the dependence of the test on atmospheric and wind-roughened sea models. Radiosonde observations (RaObs) coincident with TOPEX satellite overpasses were used to reduce errors due to inexact knowledge of the atmosphere. Their tests confirm the superior performance of the Ellison model at higher frequencies. In an effort to remove the residual bias between the models and the observations, they also suggest a parameterized modification to both models that "best fits" the models to the data. In this case, the modified Ellison model maintains its superior performance at high frequencies, suggesting that it has an inherently more accurate frequency dependence. The root mean-squared (RMS) error in the modified Ellison emissivity model, over the range of 18-40 GHz, is found to be 0.0037, which translates into a model error of approximately 1 K in terms of brightness temperatures.
机译：对L.A. Klein等人的修改。 W.J. Ellison等人最近提出了镜面海洋发射率模型（1997年）。 （1996年），以提高在高微波频率下的性能。本文中介绍的工作使用一组卫星和地面观测来测试原始模型和修改后的模型，该模型旨在尽可能消除测试对除表面发射本身以外的参数的依赖性。晴朗的天空，低湿度和低风条件仅用于减少测试对大气和风浪海洋模型的依赖性。与TOPEX卫星天桥相吻合的无线电探空仪观测（RaObs）用于减少由于对大气的不精确了解而引起的误差。他们的测试证实了Ellison模型在较高频率下的优越性能。为了消除模型和观测值之间的残留偏差，他们还建议对两个模型进行参数化修改，以使模型“最适合”数据。在这种情况下，修改后的Ellison模型在高频下仍保持其优越的性能，这表明它具有固有的更精确的频率依赖性。发现在18-40 GHz范围内，修改后的Ellison发射率模型的均方根（RMS）误差为0.0037，就亮度温度而言，这相当于大约1 K的模型误差。

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