Introduction, purpose and scope

This is a ATBD for a SIT retrieval algorithm for CIMR. The method described here is planned to use CIMR L1b brightness temperatures and corresponding output will be L2, i.e. gridded sea ice thickness values in EASE2 coordinates. For the retrieval only L-band brightness temperatures will be used in H and V polarization. Required information for the retrieval include the TB and corresponding uncertainties. The algorithm is based on the work of [Huntemann et al., 2014] and [Paţilea et al., 2019] works originally on intensity and polarization difference. In this ATBD the algorithm is modified to use directly instrument provided horizontal and vertical TB polarization, including their uncertainties.

This document is describing the algorithm and processing steps and the processing of the L2 SIT product. The document is intended for the CIMR users and parties interested in the details of the algorithm. It is not intended to replace a product user guide. The algorithm is demonstrated in Jupyter notebooks where the code cells are not displayed in this book variant. The main algorithm and supporting routines will be separated from the notebooks in the algorithm directory of this repository.