Cristin-prosjekt-ID: 676915
Sist endret: 24. september 2020 10:33

Cristin-prosjekt-ID: 676915
Sist endret: 24. september 2020 10:33
Prosjekt

Subglacial Water Impact on long term glacier Dynamics (SWItchDyn)

prosjektleder

Basile de Fleurian
ved Institutt for geovitenskap ved Universitetet i Bergen

prosjekteier / koordinerende forskningsansvarlig enhet

  • Universitetet i Bergen

Finansiering

  • TotalbudsjettNOK 7.945.000
  • Norges forskningsråd
    Prosjektkode: 287206

Klassifisering

Vitenskapsdisipliner

Kvartærgeologi, glasiologi

Emneord

Prosessmodellering • Subglasial hydrologi

Kontaktinformasjon

Sted
Basile de Fleurian

Tidsramme

Aktivt
Start: 1. april 2019 Slutt: 31. mars 2023

Beskrivelse Beskrivelse

Tittel

Subglacial Water Impact on long term glacier Dynamics (SWItchDyn)

Populærvitenskapelig sammendrag

The current warming over Greenland leads to an increase of the melt at the surface of the ice sheet. This means that a larger volume of water reaches the base of the glacier where it can greatly impact its dynamic. SWItchDyn will investigate the long-term impact of this increase in melt water volume on the dynamics of glaciers.

At the base of glaciers, an increase in water pressure triggers an acceleration of the ice flow. Water pressure is however not directly related to the volume of available water. This is due to the fact that the subglacial drainage system can adapt depending on the provided volume of water. Under a low water input, the drainage system will be able to drain only a small amount of water with a relatively high pressure. As the volume of water increases, the pressure increases until a threshold is reached where the drainage system becomes more efficient. This shift from an inefficient to an efficient drainage system leads to a decrease of the water pressure and a reduction of the glacier's velocity.

In order to better understand these interactions, SWItchDyn will combine two different approaches. A numerical model will be used to get a better understanding of the relations between the hydrological and ice-dynamical system. In parallel, observations of the surface velocities on glaciers will be analyzed to give a better idea of the current state of the subglacial drainage system. We will combine the results from these two different approaches to build a realistic simulation of the west coast of Greenland. This final simulation will provide an estimate of the effect of the melt water volume increase on the mass loss of the Greenland Ice Sheet.

prosjektdeltakere

prosjektleder

Basile de Fleurian

  • Tilknyttet:
    Prosjektleder
    ved Institutt for geovitenskap ved Universitetet i Bergen
  • Tilknyttet:
    Prosjektdeltaker
    ved Bjerknessenteret ved Universitetet i Bergen

Paul Halas

  • Tilknyttet:
    Prosjektdeltaker
    ved Institutt for geovitenskap ved Universitetet i Bergen
  • Tilknyttet:
    Prosjektdeltaker
    ved Bjerknessenteret ved Universitetet i Bergen

Hélène Seroussi

  • Tilknyttet:
    Prosjektdeltaker
    ved Jet Propulsion Laboratory

Jérémie Mouginot

  • Tilknyttet:
    Prosjektdeltaker
    ved Centre national de la recherche scientifique

Mathieu Morlighem

  • Tilknyttet:
    Prosjektdeltaker
    ved University of California, Irvine
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Resultater Resultater

Present day Jakobshavn Isbræ close to the Holocene minimum extent.

Kajanto, Karita Anneli; Seroussi, Hélène; de Fleurian, Basile; Nisancioglu, Kerim Hestnes. 2020, Quaternary Science Reviews. JPL, UIBVitenskapelig artikkel

Exceptionally high heat flux needed to sustain the Northeast Greenland Ice Stream.

Smith-Johnsen, Silje; de Fleurian, Basile; Schlegel, Nicole; Seroussi, Hélène; Nisancioglu, Kerim Hestnes. 2020, The Cryosphere. JPL, UIBVitenskapelig artikkel

Geometric Controls of Fjord Glacier Dynamics.

Frank, Thomas; Åkesson, Henning; de Fleurian, Basile; Nisancioglu, Kerim Hestnes. 2020, EGU General Assembly 2020. SU, UIBVitenskapelig foredrag

What’s at the base? Subglacial hydrology and its impact on ice dynamics.

de Fleurian, Basile. 2019, UiO Lunch seminar. UIBFaglig foredrag

The meltwater lubrication feedback, impact of the melt season duration and time stepping considerations.

de Fleurian, Basile; Langebroek, Petra. 2019, EGU General Assembly. NORCE, UIBPoster
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