Abstract
Hot-water drilling and mass-balance measurements were carried out on the Inland Ice at Pakitsoq north-east of Jakobshavn. Observations of water level fluctuations in the drill holes indicate a high subglacial water pressure close to the ice overburden pressure. Mapping the occurrence of Wisconsinan ice along the ice margin, by sampling of surface ice, was continued and observations were made around an unexpected tapping of an ice dammed lake.
Highlights
Hot-water drilling and mass-balance measurements were carried out on the Inland Ice at Påkitsoq north-east of Jakobshavn
The main emphasis has been on description and understanding of the meltwater drainage on, in and below the ice for delineation of drainage basins on the Inland Ice
Surface topographical and ice-thickness data have been used for modelling meltwater drainage below the ice (Thomsen et al, 1988) and mass balance data have been collected over the seven year period
Summary
The fjeld work in 1989 was carried out from a base camp located on the glacier tongue leading to lake 326 (fig. 1), about 600 m upstream from the ice margin. The fjeld work in 1989 was carried out from a base camp located on the glacier tongue leading to lake 326 The transient balance for the winter period was measured in snow pits and by depth sounding at the stakes. The sevcn year record af mass-balance measurements presently under eomputation is being related to temperature reeords eolleeted on the iee (Thomsen, 1985). Eight holes were drilled near the hase camp along two profiles on the glaeier tongue leading to lakc 326 In all the holes water level dropped several metres below the iee surfaee either cturing drilliog or when the drill stopped advancing at the bottom af the iee, indicating conncction to an englacial ar subglacial drainage system. The generally high water pressure and the observation that the water-ice pressure ratio is ve ry similar from hole to hole eonfirms assumptions in the modeIling of subglacial drainage (Thomsen et al, 19R9a)
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