Important Notice (3/24/2026): NOAA NWS/NCEP has terminated the NCEP/NCAR R1 reanalysis as of March 18th, 2026. NCEP/NCAR R1 has been used as the atmospheric forcing data in the PIOMAS reanalysis . We had not been aware of this change in service which was apparently formally announced Feb 13. 2026. This means that we will have to find alternatives and generate a replacement. It will take considerable effort and time to update data streams, re-calibrate the model and generate updated time series. We don’t yet have a good sense if that’s possible with available funds and if so, when we will be … Continue reading PIOMAS Arctic Sea Ice Volume Reanalysis