Cristin-resultat-ID: 1810543
Sist endret: 15. september 2020 12:01
Resultat
Vitenskapelig foredrag
2020

Geometric Controls of Fjord Glacier Dynamics

Bidragsytere:
  • Thomas Frank
  • Henning Åkesson
  • Basile de Fleurian og
  • Kerim Hestnes Nisancioglu

Presentasjon

Navn på arrangementet: EGU General Assembly 2020
Sted: Wien - Virtual conference
Dato fra: 4. mai 2020
Dato til: 8. mai 2020

Arrangør:

Arrangørnavn: EGU

Om resultatet

Vitenskapelig foredrag
Publiseringsår: 2020

Beskrivelse Beskrivelse

Tittel

Geometric Controls of Fjord Glacier Dynamics

Sammendrag

Retreat of marine outlet glaciers and ice shelves may initiate depletion of inland ice and lead to ice loss that by far exceeds what would be expected from ocean and atmospheric warming alone. Many marine outlet glaciers draining large parts of past and present ice masses have shown non-linear and variable retreat rates, with adjacent glaciers sometimes showing a highly different response to the same large-scale climate forcing. This suggests that individual glacier characteristics play a dominant role in governing retreat. There is widespread evidence that the dynamic glacier adjustment to an external forcing is highly influenced by fjord topography. However, whether this stabilizes the glacier, or promotes enhanced retreat, depends on the shape of the fjord. So far, no rigorous, systematic assessment of the exact influence of certain geometric features such as overdeepenings or embayments has been undertaken in a model framework that incorporates all relevant processes in a 3D layout. Here, we analyze a multitude of topographic settings and scenarios using the Ice Sheet System Model (ISSM), which accounts for all relevant physics in a 3D framework. Using artificial fjord geometries, we investigate glacier-topography interaction and quantify the modeled glacier response directly in relation to topographic features. In light of our modeled topographic influence on glacier retreat, we consider whether we reliably can extrapolate observations from a few well-monitored glaciers to those less studied. Furthermore, we discuss implications for past and future ice sheet mass loss and associated sea-level rise. Finally, a deeper understanding of processes at the glacier front improves confidence in the climate signal derived from the deglacial landscape, as glacier-proximal landforms can more confidently be linked to climate.

Bidragsytere

Thomas Frank

  • Tilknyttet:
    Forfatter
    ved Stockholms universitet

Henning Martin Åkesson

Bidragsyterens navn vises på dette resultatet som Henning Åkesson
  • Tilknyttet:
    Forfatter
    ved Stockholms universitet

Basile de Fleurian

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen

Kerim Hestnes Nisancioglu

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen
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