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Altimetry Sea Ice products from CTOH

Types of dataset: Gridded Altimetry Sea Ice product for Envisat and Cryosat-2.

Contents: Gridded Altimetric Sea Ice Thickness, Sea Ice Freeboard, Snow Depth, Snow Density, Sea Ice density, Sea Ice thickness uncertainty, multi year ice fraction for Envisat and Cryosat-2.

Use: Climate, ocean/atmosphere studies, primary production,...

Condition of access: products delivered for any purposes as stated in the licence agreement.

Data access service:  FTP, TDS

Description: The Altimetry Sea Ice product is computed by CTOH and is estimated from the Envisat (2002-2012) and CryoSat-2 (2010-present) ESA satellite missions.

Geographic coverage: 
65°N < latitude < 88°N for Cryosat-2 and 81.5°N for the other datasets.
Antarctic (soon available): 

88°S for Cryosat-2 and 81.5°S for the other datasets < latitude < 55°S

Format: NetCDF-4 Classic.



  • For Envisat and CryoSat-2 FB and SIT :

- Guerreiro, K., Fleury, S., Zakharova, E., Kouraev, A., Rémy, F., Maisongrande, P., 2017. Comparison of CryoSat-2 and ENVISAT radar freeboard over Arctic sea ice: toward an improved Envisat freeboard retrieval. The Cryosphere 11, 2059–2073. 

  •  For the Snow Depth :                                                                                                   

- Garnier, F., Fleury, S., Garric, G., Bouffard, J., Tsamados, M., Laforge, A., Bocquet, M., Fredensborg Hansen, R. M., and Rémy, F.: Advances in altimetric snow depth estimates using bi-frequency SARAL/CryoSat-2 Ka/Ku measurements, The Cryosphere Discuss. [preprint], , in review, 2021.

- Guerreiro, K., Fleury, S., Zakharova, E., Rémy, F., Kouraev, A., 2016. Potential for estimation of snow depth on Arctic sea ice from CryoSat-2 and SARAL/AltiKa missions. Remote Sensing of Environment 186, 339–349. 

Citation: Publications should include the following statement in the Acknowledgments:
“The data used in this study (doi 10.6096/CTOH_SEAICE_2019_12) were developed, validated by the CTOH/LEGOS, France and distributed by Aviso+”.

Copyright : 2002 - 2019 These products were developed and validated by the CTOH/LEGOS.

Altimetry Sea Ice product

Authenticated access service Content Area Type Data period Main variables
Cryosat-2/Saral Available via your personal space: MY AVISO+ one file containing monthly means for each 25km and 50km filtering radius


L4 gridded 2013-2019 -Sea ice Freeboard
-Alti Snow Depth
-Sea Ice Thickness
Cryosat-2 2010-2019 -Sea ice Freeboard
-Modified Warren Snow Depth
-Sea Ice Thickness
-Sea Level Anomalies
Envisat  2002-2012 -Sea ice Freeboard
-Snow Depth:
Modified Warren (Arctic)
AMSR (Antarctic)
-Sea Ice Thickness



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