Preprints
https://doi.org/10.5194/tc-2021-185
https://doi.org/10.5194/tc-2021-185

  11 Aug 2021

11 Aug 2021

Review status: this preprint is currently under review for the journal TC.

Arctic Sea Ice Thickness Estimation Based on CryoSat-2 Radar Altimeter and Sentinel-1 Dual-Polarized SAR

Juha Karvonen1, Eero Rinne1, Heidi Sallila1, Petteri Uotila2, and Marko Mäkynen1 Juha Karvonen et al.
  • 1Finnish Meteorological Institute, PB 503, FI-00101, Helsinki, Finland
  • 2Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki, Finland

Abstract. We present a method to combine CryoSat-2 (CS-2) radar altimeter and Sentinel-1 synthetic aperture radar (SAR) data to obtain sea ice thickness (SIT) estimates for the Barents and Kara Seas. Our approach yields larger spatial coverage and better accuracy compared to estimates based on either CS-2 or SAR alone. The SIT estimation method developed here is based on interpolation and extrapolation of CS-2 sea ice thickness (SIT) utilizing SAR segmentation and segmentwise SAR texture features. The SIT results are compared to SIT data derived from the AARI ice charts, to ORAS5. PIOMAS and TOPAZ4 ocean-sea ice data assimilation system reanalyses, and to daily MODIS based ice thickness charts. Our results are directly applicable to the future CRISTAL mission and Copenicus programme SAR missions.

Juha Karvonen et al.

Status: open (until 27 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Juha Karvonen et al.

Juha Karvonen et al.

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Short summary
We propose a method to provide sea ice thickness (SIT) estimates over a test area in the Arctic utilizing radar altimeter (RA) measurement lines and C-band SAR imagery, the RA data are from CryoSat-2 and SAR imagery from Sentinel-1. By combining we get a SIT grid covering the whole test area instead of only narrow measurement lines from RA. This kind of SIT estimation can be extended to cover the whole Arctic (and Antarctic) for operational SIT monitoring.