Abstract
The burial depths of three internal layers detected by airborne radar sounding in the Dye-3 region of southern Greenland are used to infer past changes in the accumulation rate in the region. Averaged over the period since the deepest layer was deposited (∽1700 to ∽2000 yr BP) the ratio of accumulation rates at the western and eastern ends of the 60 km recorded length of the layers was 0.63, with accumulation increasing to the east. According to recent maps, the present-day value of this ratio is 0.78-0.87. Thus, the distribution of accumulation appears to have become more uniform, because of a decrease in accumulation rate at the eastern end of the flightline, an increase at the western end, or a combination of both. Observed patterns of thickness change and the displacement of the ice crest westward relative to the flow divide are both consistent with a recent decrease in accumulation rate on the eastern end of the segment of flightline considered.
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