Arndt Evans et al_G-Cubed_2015.pdf (23.63 MB)
A new bathymetry of the Northeast Greenland continental shelf: constraints on glacial and 2 other processes
journal contribution
posted on 2015-11-26, 13:58 authored by J.E. Arndt, Wilfried Jokat, Boris Dorschel, Myklebust Myklebust, Julian A. Dowdeswell, Jeffrey EvansJeffrey EvansA new digital bathymetric model (DBM) for the Northeast Greenland (NEG) continental shelf (74°N–81°N) is presented. The DBM has a grid cell size of 250 m × 250 m and incorporates bathymetric data from 30 multibeam cruises, more than 20 single-beam cruises and first reflector depths from industrial seismic lines. The new DBM substantially improves the bathymetry compared to older models. The DBM not only allows a better delineation of previously known seafloor morphology but, in addition, reveals the presence of previously unmapped morphological features including glacially derived troughs, fjords, grounding-zone wedges, and lateral moraines. These submarine landforms are used to infer the past extent and ice-flow dynamics of the Greenland Ice Sheet during the last full-glacial period of the Quaternary and subsequent ice retreat across the continental shelf. The DBM reveals cross-shelf bathymetric troughs that may enable the inflow of warm Atlantic water masses across the shelf, driving enhanced basal melting of the marine-terminating outlet glaciers draining the ice sheet to the coast in Northeast Greenland. Knolls, sinks, and hummocky seafloor on the middle shelf are also suggested to be related to salt diapirism. North-south-orientated elongate depressions are identified that probably relate to ice-marginal processes in combination with erosion caused by the East Greenland Current. A single guyot-like peak has been discovered and is interpreted to have been produced during a volcanic event approximately 55 Ma ago.
History
School
- Social Sciences
Department
- Geography and Environment
Published in
Gdeochemistry, Geophysics, GeosystemsCitation
ARNDT, J.E. ... et al., 2015. A new bathymetry of the Northeast Greenland continental shelf: constraints on glacial and 2 other processes. Geochemistry, Geophysics, Geosystems, 16(10), pp. 3733–3753.Publisher
© 2015. American Geophysical Union. Published by WileyVersion
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2015Notes
This article was published in the journal, Geochemistry, Geophysics, Geosystems [© 2015. American Geophysical Union. Published by Wiley] and the definitive version is also available at: http://dx.doi.org/10.1002/2015GC005931ISSN
1525-2027eISSN
1525-2027Publisher version
Language
- en