Abstract
With the help of the geodetic surveys of the EGIG (International Glaciological Greenland Expedition) profile in 1959 and 1968 and the absolute measurements of the deformations of the inclined shaft “Dumont,” the vertical velocity of the ice at Jarl-Joset station, Greenland, is determined. This velocity is shown to be independent of short-time variations of the accumulation rate and is therefore characteristic for the long-term movement of the ice sheet. By comparison of this velocity with the short-time accumulation, it is shown that the mass budget in the last ten years in negative (∼20%), which explains the lowering of the surface measured by the survey.
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