A successful pilot project has added support for locating a year-round interdisciplinary environmental observatory at the 3200-m summit of the Greenland ice sheet (Figure 1). Such a facility will enable numbers of European and U.S. scientists to make continuous measurements at a unique, high elevation, Northern Hemisphere location (Figure 2). From August 1997 through April 1998 a pilot winter-over program of atmospheric and snow measurements was carried out, in part to test the feasibility of a longer-term year-round facility Year-round measurements are expected to resume in the summer of 2000.