NOAA@NSIDC is pleased to announce that the Climate Data Record of Passive Microwave Sea Ice Concentration, Version 4 data set, accessible through the National Snow and Ice Data Center (NSIDC), has been updated to include the time period of 01 June 2021 through 31 December 2021. This data set provides a consistent daily and monthly time series of sea ice concentrations from 25 October 1978 through 31 December 2021 for both the north and south polar regions on a 25 km x 25 km grid.
Note that the 2021 data for June to December for the near-real-time (NRT) version of this data set, Near-Real-Time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration, Version 2, have been removed since the final processed version supersedes the NRT version. If you have 2021 NRT data, we suggest that you download and replace it with the 2021 final processed version of this data set.
To access these data and view the documentation, visit the data set web page.
Data Set DOI: https://doi.org/10.7265/efmz-2t65