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Bed topography and subglacial landforms in the onset region of the Northeast Greenland Ice Stream

Franke, Steven; Jansen, Daniela; Binder, Tobias; Dörr, Nils; Helm, Veit; Paden, John; Steinhage, Daniel; Eisen, Olaf

Abstract (englisch):
The Northeast Greenland Ice Stream (NEGIS) is an important dynamic component for the total mass balance of the Greenland ice sheet, as it reaches up to the central divide and drains 12% of the ice sheet. The geometric boundary conditions and in particular the nature of the subglacial bed of the NEGIS are essential to understand its ice flow dynamics. We present a record of more than 8000 km of radar survey lines of multi-channel, ultra-wideband radio echo sounding data covering an area of 24 000 km2, centered on the drill site for the East Greenland Ice-core Project (EGRIP), in the upper part of the NEGIS catchment. Our data yield a new detailed model of ice-thickness distribution and basal topography in the region. The enhanced resolution of our bed topography model shows features which we interpret to be caused by erosional activity, potentially over several glacial–interglacial cycles. Off-nadir reflections from the ice–bed interface in the center of the ice stream indicate a streamlined bed with elongated subglacial landforms. Our new bed topography model will help to improve the basal boundary conditions of NEGIS prescribed for ice flow models and thus foster an improved understanding of the ice-dynamic setting.

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Verlagsausgabe §
DOI: 10.5445/IR/1000117782
Veröffentlicht am 19.03.2020
Originalveröffentlichung
DOI: 10.1017/aog.2020.12
Scopus
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photogrammetrie und Fernerkundung (IPF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0260-3055, 1727-5644
KITopen-ID: 1000117782
Erschienen in Annals of Glaciology
Seiten 1–11
Vorab online veröffentlicht am 18.03.2020
Schlagwörter Glacial geomorphology; glacier flow;ice streams; processes and landforms ofglacial erosion; radio-echo sounding
Nachgewiesen in Scopus
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