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225GHz opacity measurements at Summit camp, Greenland, for the GreenLand Telescope (GLT) site testing

We report three winter seasons and two full summer from August 2011 to April 2014 of atmospheric opacity measurements with a 225GHz tipping radiometer at Summit camp in Greenland (Latitude 72°.57 N, Longitude 38°.46 W, Elevation 3250 masl). The summit of the ice cap in Greenland is expected to be the location for the GreenLand Telescope (GLT), a 12 meters aperture millimeter / sub-millimeter telescope with VLBI and single- dish capability. The winter regime (November to April) is of particular interest for sub-millimeter observations since the opacities lower quartile in these months can get as low as 0.042, with occasional opacities as low as 0.025. We then compare Summit zenith opacities to other submillimeter sites.