Articles | Volume 17, issue 9
https://doi.org/10.5194/tc-17-3721-2023
https://doi.org/10.5194/tc-17-3721-2023
Research article
 | 
01 Sep 2023
Research article |  | 01 Sep 2023

Assimilating CryoSat-2 freeboard to improve Arctic sea ice thickness estimates

Imke Sievers, Till A. S. Rasmussen, and Lars Stenseng

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Short summary
The satellite CryoSat-2 measures freeboard (FB), which is used to derive sea ice thickness (SIT) under the assumption of hydrostatic balance. This SIT comes with large uncertainties due to errors in the observed FB, sea ice density, snow density and snow thickness. This study presents a new method to derive SIT by assimilating the FB into the sea ice model, evaluates the resulting SIT against in situ observations and compares the results to the CryoSat-2-derived SIT without FB assimilation.