This is the official fourth release of the CIMR Mission Requirements Document (MRD v4), prepared by ESA, including contributions of the Mission Advisory Group.
The MRD is a key reference document for the CIMR mission.
Satellite observation is the only way to effectively monitor the polar oceans and sea ice on a broad scale, but in-situ data are crucial to developing and calibrating the retrieval algorithms. Read here how the MOSAiC expedition contributes for CIMR (among other missions).
A new call for experts to join the CIMR Mission Advisory Group is currently open at http://missionadvice.esa.int/. Send your application online before December 2nd.
The contract with Thales Alenia Space Italy to build CIMR was signed on 13 November 2020!
Satellite observation is the only way to effectively monitor the polar oceans and sea ice on a broad scale, but in-situ data are crucial to developing and calibrating the retrieval algorithms. Read 
The CIMRex campaign dataset (Hutrad 2.0 X, C , Ku and IR measurements) and final report are freely available.