Glaciological Investigations in the Crête Area, Central Greenland: A Search for a new Deep-Drilling Site

The results of the 1984-85 post-GISP campaigns in central Greenland are presented. Eight ice cores were obtained, some spanning up to 360 years. We present: I. Geographical positions and elevations at the drill sites, II. Density and temperature in the bore holes, III. Filtered δ18O profiles and accumulation-rate variations along the ice cores. The δ18O and accumulation profiles, along with those from the 400 m Crête ice core obtained in 1974, are compared. The accumulation-rate series over a large region have a very high coherence. This indicates that a single bore hole in this region would give a representative accumulation time series over a long period. Further, it appears that for this region there is a linear relation between the measured annual accumulation rate and the mean annual δ18O values. Thus the area between Crête and Summit, just west of the ice divide, seems to be favorable for a deep-drilling operation.