New version of the OSISAF Sea Ice Concentration Climate Data Record


The EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF) team is pleased to announce the release of OSI-450, a new full reprocessing of its Sea Ice Concentration (SIC) Climate Data Record (CDR). The release provides a SIC CDR over the polar regions, derived from passive microwave satellite data of SMMR, SSM/I and SSMIS, covering years 1979 to 2015.

This is the second version of such a sea ice concentration CDR by the OSI SAF. The basic principles and methodologies that were the backbone of our previous CDR (OSI-409) are still featured in OSI-450 (e.g. atmospheric correction of brightness temperature with NWP re-analysis data, state of the art algorithms, dynamic tie-points, uncertainties, etc...). They were nevertheless all revisited for this new release, through dedicated R&D in the OSI SAF project and in the ESA Climate Change Initiative ( Sea Ice projects, whose contribution is acknowledged. Key improvements embedded in OSI-450 are more accurate and stable algorithms, open water filters to limit false ice detection over the ocean, and more realistic uncertainty estimates.

Interested users of OSI-450 are invited to explore and download the data from our website ( and FTP server (

We hope the OSI-450 can be of interest for your applications and research, and stay available for any questions you might have on this CDR at

All the best, The OSI SAF HL Team, at the Norwegian and Danish Meteorological Institutes