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The map below shows the difference between National Ice Center ice (yellow) and NSIDC ice (red.)
NSIDC uses microwave emissions to spot ice, and they are missing lots of ice which is seen in visible light.
//ARCTIC.IO/OBSERVATIONS/8/2012-08-18/8-N76.083133-W160.925244
National Ice Center August 18 2012 vs August 18 2007.
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