This dataset contains coupled reanalysis data for of NorCPM data assimilation system with strongly coupled assimilation of the ocean and sea ice component (V1C). The system assimilates monthly observations of sea surface temperature (SST) and temperature-salinity (TS) profiles using EnKF algorithm. The reanalysis utilized the medium-resolution Norwegian Earth System Model version 1 (NorESM1-ME) and covered the period 1980-2010. The seasonal hindcasts are 60 members from 1985–2010 with 60 members, 4 start date per year (February, May, August, November) and running each for 13 months. There is also an extension of the Free ensemble run of the model without assimilation (member 31-member 60).