Greenland ice melt, 2000. The ice sheet melt extent is a daily estimate of the spatial extent of wet snow on the Greenland ice sheet, and is derived from passive microwave satellite brightness temperature measurements. This is representative of the amount of ice loss due to seasonal melting. This image shows (in red) the regions of the Greenland ice sheet over which melt occurred for more than three days in 2000 between 1 May and 30 September.