Abstract
The paper introduces two widely used atmospheric absorption models: MPM by Liebe in 1989 and Ulaby in 1976. Compare between them based on ground-based microwave radiometer, this paper presents an atmospheric absorption model with improvement including local line absorption, noresonant dry air spectrum, water vapor continuum, suspended water droplet refractivity and rain effects. Also, using the improved absorption model, the paper simulates the temperature and humidity weighting functions and brightness temperature. The results show that in the retrievals of ground-based microwave radiometer, the improvement of atmospheric absorption can derive more accurate brightness temperatures which are more agreement with the actual measuring brightness temperatures.
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