کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5430396 | 1397400 | 2008 | 15 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Atmospheric trace gases profile retrievals using the nonlinear regularized total least squares method Atmospheric trace gases profile retrievals using the nonlinear regularized total least squares method](/preview/png/5430396.png)
We discuss the regularized total least squares (RTLS) method for the nonlinear overdetermined ill-posed problem of atmospheric trace gas retrieval. The RTLS method is used for the automatic determination of the regularization strength of the ill-conditioned matrix in an iterative process, and a mixed quadratic and cubic line search method is used for the nonlinear retrievals. Additional retrieval metrics, such as the model resolution matrix and the degrees of freedom in the retrieval, which characterize the vertical resolution of the retrievals, are also derived. Simulated retrievals as well as the retrieval from the data of a balloon-based spectroscopic measurement will be discussed. Retrieval results obtained using O3 and CH4 as test cases will be presented.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 109, Issue 11, July 2008, Pages 2045-2059