The current version of the AWI CryoSat-2 sea ice product in the northern hemisphere is version 2.1 that has been released in October 2018. The previous versions have been discontinued.
Please see Whats new in version 2.1 and how to Access Data Products.
Acknowledgements
Cryosat-2 Level-1 data is courtesy of the European Space Agency. See the official ESA CryoSat website or the ESA CryoSat-2 Wiki for details.
Sea ice concentration and type auxiliary data is courtesy of the Ocean and Sea Ice Satellite Application Facility (OSI-SAF)
Global mean sea surface products (DTU15/DTU18) is courtesy of the Danish National Space Institute (DTU Space)