Northern Hemisphere Sea Ice extent
Monthly mean sea ice extent in the Northern Hemisphere since 1979. The ice extent values are calculated from the latest reprocessed ice concentration data set (OSI-409),
from The Ocean and Sea Ice, Satellite Application Facility (OSISAF). Ice extent corresponds to the area
where ice concentration is greater than 15%. The most recent ice extend values are calculated from an interim ice concentration climate data set (OSI-430). The interim data close the gap between the
latest reprocessed ice concentration data set and today. The interim sea ice extent values will be replaced by certified climate data records when new climate data are calculated. The monthly mean sea ice extent product is generated by Copernicus Marine environment monitoring service based on OSISAF ice concentration data. You can find the data here and the data are presented graphically here.
Possible differences between this sea ice extent estimate and other estimates are most likely caused by differences in the applied algorithms and in the definition of ice extent.
Sea Ice Extent - monthly mean values (Mill.km2)
Monthly mean Sea Ice Extent since 1979, in the Northern Hemisphere. Ice Extent values are calculated from the latest OSI SAF climate data record and from an interim ice concentration climate product (see links to the left). The interim ice extent values fill in the gap between the latest update of the OSI SAF climate data set, and today. The monthly record-low values are red and the corresponding record-high values are green.