When it comes to up-to-date measures of arctic sea ice, the most popular choice with Anthony Watts and Steve Goddard is the estimated extent from DMI. Others seem to prefer NSIDC data for monthly averages of both sea ice area and sea ice extent, or JAXA for daily data on sea ice extent, or daily sea ice area data from Cryosphere Today. So there are several satellite-based data sets to choose from, but Watts seems to prefer, and Goddard seems to love, the DMI data.
Wonder why?
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