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Geometric controls of tidewater glacier dynamics

Frank, Thomas (författare)
Uppsala universitet,Institutionen för geovetenskaper,Univ Bergen, Bjerknes Ctr Climate Res, Dept Earth Sci, Bergen, Norway.
Åkesson, Henning (författare)
Stockholms universitet,Institutionen för geologiska vetenskaper,University of Oslo, Norway,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden.;Bolin Ctr Climate Res, Stockholm, Sweden.;Univ Oslo, Dept Geosci, Oslo, Norway.
de Fleurian, Basile (författare)
Univ Bergen, Bjerknes Ctr Climate Res, Dept Earth Sci, Bergen, Norway.
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Morlighem, Mathieu (författare)
Dartmouth Coll, Dept Earth Sci, Hanover, NH 03755 USA.;Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA.
Nisancioglu, Kerim H. (författare)
Univ Bergen, Bjerknes Ctr Climate Res, Dept Earth Sci, Bergen, Norway.;Univ Oslo, Ctr Earth Evolut & Dynam, Oslo, Norway.
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 (creator_code:org_t)
2022-02-17
2022
Engelska.
Ingår i: The Cryosphere. - : Copernicus GmbH. - 1994-0416 .- 1994-0424. ; 16:2, s. 581-601
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Retreat of marine outlet glaciers often initiates depletion of inland ice through dynamic adjustments of the upstream glacier. The local topography of a fjord may promote or inhibit such retreat, and therefore fjord geometry constitutes a critical control on ice sheet mass balance. To quantify the processes of ice–topography interactions and enhance the understanding of the dynamics involved, we analyze a multitude of topographic fjord settings and scenarios using the Ice-sheet and Sea-level System Model (ISSM). We systematically study glacier retreat through a variety of artificial fjord geometries and quantify the modeled dynamics directly in relation to topographic features. We find that retreat in an upstream-widening or upstream-deepening fjord does not necessarily promote retreat, as suggested by previous studies. Conversely, it may stabilize a glacier because converging ice flow towards a constriction enhances lateral and basal shear stress gradients. An upstream-narrowing or upstream-shoaling fjord, in turn, may promote retreat since fjord walls or bed provide little stability to the glacier where ice flow diverges. Furthermore, we identify distinct quantitative relationships directly linking grounding line discharge and retreat rate to fjord topography and transfer these results to a long-term study of the retreat of Jakobshavn Isbræ. These findings offer new perspectives on ice–topography interactions and give guidance to an ad hoc assessment of future topographically induced ice loss based on knowledge of the upstream fjord geometry.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)

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