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Volume 11, issue 6
The Cryosphere, 11, 2883-2896, 2017
https://doi.org/10.5194/tc-11-2883-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
The Cryosphere, 11, 2883-2896, 2017
https://doi.org/10.5194/tc-11-2883-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Dec 2017

Research article | 12 Dec 2017

Glaciological settings and recent mass balance of Blåskimen Island in Dronning Maud Land, Antarctica

Vikram Goel1, Joel Brown1,2, and Kenichi Matsuoka1 Vikram Goel et al.
  • 1Norwegian Polar Institute, Tromsø, Norway
  • 2Aesir Consulting LLC, Missoula, Montana, USA

Abstract. The ice-shelf-fringed coast of Dronning Maud Land in East Antarctica contains numerous ice rises that influence the dynamics and mass balance of the region. However, only a few of these ice rises have been investigated in detail. Here, we present field measurements of Blåskimen Island, an isle-type ice rise adjacent to Fimbul Ice Shelf. This ice rise is largely dome shaped, with a pronounced ridge extending to the south-west from its summit (410ma.s.l.). Its bed is mostly flat and about 100m below the current sea level. Shallow radar-detected isochrones dated with a firn core reveal that the surface mass balance is higher on the south-eastern (upwind) slope than on the north-western (downwind) slope by ∼37%, and this pattern has persisted for at least the past decade. Moreover, arches in radar stratigraphy suggest that the summit of the ice rise has been stable for ∼600 years. Ensemble estimates of the mass balance using the input–output method show that this ice rise has thickened by 0.12–0.37m ice equivalent per year over the past decade.

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Short summary
Ice rises are locally grounded features surrounded by ice shelves. They help to stabilize the Antarctic Ice Sheet and in turn are affected by ice-sheet evolution. However, details of these influences depend on the glaciological settings of the ice rises. We first present detailed ground-based investigations from Blåskimen Island ice rise in East Antarctica. We found that the ice rise is at least ~ 600-years old and has been thickening by ~ 0.3 m per year over the past decade.
Ice rises are locally grounded features surrounded by ice shelves. They help to stabilize the...
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