Application of Nonlinear Inversion Techniques to Ground-Based Microwave Observations

摘要

The study investigates the problem of extracting information on temperature structure of the troposphere, from passive microwave observations of thermal emission in the 60 GHz oxygen absorption band. The research effort consists of the development and application of nonlinear inversion techniques to observed brightness temperatures, measured from the earth's surface as a function of frequency and zenith angle. Two nonlinear techniques, employing spline functions (connected line segments) in one case and Fourier cosine terms in the other, were developed and applied to real observations at frequencies of 66.5, 67.0, and 69.0 GHz. The results of inversion solutions are presented, and an analysis of the agreement with independent radiosonde observations is given. (Author)