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Tuesday, June 30, 2015

Arctic Sea Ice Extent, ice concentration higher than 30%, June 30, 2015, DMI

6/27/15, "Arctic Sea Ice Extent, The Northern Hemisphere Sea Ice Coverage," Danish Meteorological Institute, DMI

"Sea ice extent in recent years (in million km2) for the northern hemisphere, as a function of date. Please notice, that the sea ice extent in this plot is calculated with the coastal zones masked out. To see the absolute extent, go to this page.

Current Sea Ice extent

Total sea ice extent on the northern hemisphere since 2005. The ice extent values are calculated from the ice type data from the Ocean and Sea Ice, Satellite Application Facility (OSISAF), where areas with ice concentration higher than 30% are classified as ice.

The total area of sea ice is the sum of First Year Ice (FYI), Multi Year Ice (MYI) and the area of ambiguous ice types, from the OSISAF ice type product. However, the total estimated ice area is underestimated due to unclassified coastal regions where mixed land/sea pixels confuse the applied ice type algorithm. The shown sea ice extent values are therefore recommended be used qualitatively in relation to ice extent values from other years shown in the figure. In late 2012 sea ice climatology and anomaly data will be available here."


Above June 30, 2015 graph from DMI measures more than 30% ice. The June 28, 2015 graph below from NSIDC shows more than 15% ice. (June 28 is NSIDC's Arctic daily graph up as of Tues., June 30, 2015 at 5:18AM ET).

6/30/15, "Sea Ice Index, Arctic" NSIDC, National Snow and Ice Data Center

"Daily extent images show ice extent at concentrations greater than 15% for a given day with an outline of the typical extent for that day based on a 30-year (1981-2010) median (orange line)."


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