Reconstruction of basal boundary conditions at the Greenland Ice Sheet margin from gas composition in the ice

Details Reconstruction of basal boundary conditions at the Greenland Ice Sheet margin from gas composition in the ice Reconstruction of basal boundary conditions at the Greenland Ice Sheet margin from gas composition in the ice

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.118..327s&link_type=abstract

Earth and Planetary Science Letters, Volume 118, Issue 1-4, p. 327-333.

Computer Science

6

Scientific paper

Modelling the response of the Greenland Ice Sheet to a temperature increase is an essential step towards estimating the climatic changes that could affect a large area of the Northern Hemisphere in the near future and is heavily dependent on accurate evaluation of the boundary conditions at the ice-bedrock interface.
Here we use a study of gas composition in the basal ice from West Greenland. This study shows that changes in basal thermal zones occur towards the border in the marginal zone of the ice sheet. First, slight melting at crystal boundaries and vein water squeezing occurs when the ice could still be below the pressure melting point. Then, where the melting point is reached and more meltwater is produced, sliding by regelation occurs. Closer to the margin, partial freezing and ice accretion takes place, the melting point being maintained at the bed because of the latent heat release. Pressure effects induce a certain amount of decoupling. Such changes in basal flow conditions can in turn promote ice sheet thinning at the margin. A temperature increase of the air along the edge of some ice sheet areas in West Greenland, where decoupling occurs, would thus give rise to higher ablation rates and would be likely to lead to fast ice retreat.

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