Publication Date:
2023-06-27
Description:
Accumulation rates in the eastern part of Ronne Ice Shelf were determined by isotopic stratigraphy (18O). The samples were taken from snow-pits dug during the Filchner I and II operations in 1984 and 1986. In general, the accumulation rate decreases towards the south; the greatest decrease, from 21.3 to 13.3 g/cm**2/a, was observed between Filchner Station and measuring point 341, sited 270 km up-stream of the ice edge. The d18O values of the near-surface layers vary between -25 and -29 per mil. The 18O content in the more southerly part is progressively depleted in the direction of Möllereisstrom, paralleling a decrease in the accumulation rate. Near the ice edge the 18O content decreases to the west. A 100 m ice core drilled in 1984 at point 340, 22 km from the ice edge, probably goes back to A.D. 1460; it has been dated by isotopic stratigraphy.
The accumulation rate up-stream of the drilling site was deduced from the sequence of annual layers, using a simple ice-flow model. The accumulation shows strong variations over the last 200 years, which may be caused in part by local variations in the accumulation on Ronne Ice shelf.
Keywords:
AWI_Glac; B08/T340 D340; Filchner Ronne Ice Shelf; Filchner-Ronne-Ice-Shelf-Project; FRI01S84_141; FRI03S86_345; FRI04S84_140; FRI05S84_240; FRI05S86_240; FRI0686S_241; FRI06S84_241; FRI07C84_340; FRI07S84_340; FRI07S86_340; FRI08S84_341; FRI08S86_341; FRI13S86_335; FRI15S86_131; FRI16S86_230; FRI17S86_231; FRI18S86_330; FRISP 1992; Glaciology @ AWI; ICEDRILL; Ice drill; Sampling/drilling ice; SNOWPIT; Snow pit; SS131_86 D131; SS140_84 D140; SS141_84 D141; SS230_86 D230; SS231_86 D231; SS240_84 D240; SS240_86 D240; SS241_84 D241; SS241_86 D241; SS330_86 D330; SS335_86 D335; SS340_84 D340; SS340_86 D340; SS341_84 D341; SS341_86 D341; SS345_86 D345
Type:
Dataset
Format:
application/zip, 34 datasets
Permalink
