Orange on the above figure indicates where satellites measured increased melting of the Greenland Ice Sheet in 2011
For details about the measurements, see the title link. There is a phenomena involved called "Arctic Amplification". From the Arctic Report Card issued Dec 1, 2011:
"The amplification of warming in the Arctic reflects a powerful feedback between the region’s ice covers and air temperature. As air temperature increases, ice melts; as the bright, reflective ice melts, it reveals darker ocean and land surfaces. These dark surfaces absorb more solar energy during the Arctic’s summer season, when the Sun never sets. This causes more heating, which causes more melting…and so on."
Complete melting of the Greenland Ice Sheet would cause sea levels to rise 6.5 meters, or 21 feet. (USGS fs002-00)
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