Auto-adaptive Tikhonov regularization of water vapor profiles: application to FORUM measurements. Issue 10 (3rd July 2022)

• Record Type: Journal Article
• Authors: Sgheri, L.; Raspollini, P.; Ridolfi, M.
• Is Part Of: Applicable analysis. Volume 101:Issue 10(2022)
• Page Start: 3733
• Page End: 3743
• Publication Date: 2022-07-03
• Subjects: Remote sensing -- radiative transfer inversion -- regularization -- water vapor retrieval -- FORUM; 65N21 -- 35R30 -- 47A52; Mathematical analysis -- Periodicals; 515
• DOI: 10.1080/00036811.2020.1751825
• Languages: English
• ISSNs: 0003-6811

Abstract

ABSTRACT: In this paper, we study the retrieval of water vapor profiles from simulated FORUM measurements. We show that the bias towards the a-priori introduced by the Optimal Estimation technique can be reduced by using larger errors for the a-priori. Reducing the strength of the a-priori may, however, cause unphysical oscillations in the resulting profiles because of the ill-conditioning of the retrieval problem. An a-posteriori regularization technique, the Iterative Variable Strength method, is thus applied to reduce the amplitude of the oscillations.