Thermomechanical modelling of the Scandinavian ice sheet: implications for ice-stream formation

AJ Payne, DJ Baldwin

Research output: Contribution to journalArticle (Academic Journal)peer-review

29 Citations (Scopus)
276 Downloads (Pure)

Abstract

This work attempts to explain the fan-like landform assemblages observed in satellite images of the area covered by the former Scandinavian ice sheet (SIS). These assemblages have been interpreted as evidence of large ice streams within the SIS. If this interpretation is correct, then it calls into doubt current theories on the formation of ice streams. These theories regard soft sediment and topographic troughs as being the key determinants of ice-stream location. Neither can be used to explain the existence of ice streams on the flat, hard-rock area of the Baltic Shield. Initial results from a three-dimensional, thermomechanical ice-sheet model indicate that interactions between ice flow, form and temperature can create patterns similar to those mentioned above. The model uses a realistic, 20 km resolution gridded topography and a simple parameterization of accumulation and ablation. It produces patterns of maximum ice-sheet extent, which are similar to those reconstructed from the area's glacial geomorphology. Flow in the maximum, equilibrium ice sheet is dominated by wedges of warm, low-viscosity, fast-flowing ice. These are separated by areas of cold, slow-flowing ice. This patterning appears to develop spontaneously as the modelled ice sheet grows.
Translated title of the contributionThermomechanical modelling of the Scandinavian ice sheet: implications for ice-stream formation
Original languageEnglish
Pages (from-to)83 - 89
JournalAnnals of Glaciology
Volume28
Issue number1
DOIs
Publication statusPublished - Jan 1999

Bibliographical note

Publisher: International Glaciological Society
Rose publication type: Journal article

Sponsorship: This work is supported by grants from the Natural Environment Research Council (GR3/11532) and the Royal Society (18846)

Terms of use: © International Glaciological Society

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