Surface topography and ice flow in the vicinity of the EDML deep-drilling site, Antarctica


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Christine.Wesche [ at ] awi.de

Abstract

<jats:title>Abstract</jats:title><jats:p>Interpretation of ice-core records requires accurate knowledge of the past and present surface topography and stress–strain fields. The European Project for Ice Coring in Antarctica (EPICA) drilling site (75.0025° S, 0.0684° E; 2891.7 m) in Dronning Maud Land, Antarctica, is located in the immediate vicinity of a transient and forking ice divide. A digital elevation model is determined from the combination of kinematic GPS measurements with the GLAS12 datasets from the ICESat. Based on a network of stakes, surveyed with static GPS, the velocity field around the drilling site is calculated. The annual mean velocity magnitude of 12 survey points amounts to 0.74 m a<jats:sup>–1</jats:sup>. Flow directions mainly vary according to their distance from the ice divide. Surface strain rates are determined from a pentagonshaped stake network with one center point close to the drilling site. The strain field is characterized by along-flow compression, lateral dilatation and vertical layer thinning.</jats:p>



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Eprint ID
33762
DOI https://www.doi.org/10.3189/002214307783258512

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Wesche, C. , Eisen, O. , Oerter, H. , Schulte, D. and Steinhage, D. (2007): Surface topography and ice flow in the vicinity of the EDML deep-drilling site, Antarctica , Journal of Glaciology, 53 (182), pp. 442-448 . doi: https://www.doi.org/10.3189/002214307783258512


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