Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica

Written by Olivier Gagliardini.


This paper investigates the evolution of Derwael Ice Rise in Antarctica, by comparing the internal radar stratigraphy with model output from Elmer/Ice. Ice rises are situated within ice shelves and have a spatially confined flow regime with local ice divides. Beneath the divides, the ice stratigraphy often develops arches (a.k.a Raymond Bumps) with amplitudes that record the divide's horizontal residence time and surface elevation changes. By comparing the arch amplitudes with different model scenarios this study shows that Derwael Ice Rise has maintained its local flow regime for at least 5000 years. This delivers and important tie-point to better understand the ill-constrained deglaciation history in this sector of Antarctica. The combination of geophysical data and modelling also emphasizes that the surface mass balance and ice rheology need to be well-constrained for a reliable interpretation of the Raymond arches.

Reference: Drews, R, K. Matsuoka, C. Martín, D. Callens, N. Bergeot and F. Pattyn, 2015. Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia, Journal of Geophys. Res. Earth Surf., DOI: 10.1002/2014JF003246

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