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Fast-flowing outlet glaciers of the Last Glacial Maximum Patagonian Icefield

  • Neil F. Glasser (a1) and Krister N. Jansson (a2)

Abstract

Glacial geomorphology around the Northern Patagonian Icefield indicates that a number of fast-flowing outlet glaciers (the continuation of ice streams further upglacier) drained the icefield during the Last Glacial Maximum. These topographically controlled fast-flowing glaciers may have dictated the overall pattern of Last Glacial Maximum ice discharge, lowered the ice-surface profile, and forced the ice-divide westward. The influence of the fast-flowing outlet glaciers on icefield behavior also helps to explain why the configuration of the Patagonian Icefield at the Last Glacial Maximum is not accurately represented in existing numerical ice-sheet models. Fast-flowing outlet glaciers would have strongly influenced ice discharge patterns and therefore partially decoupled the icefield from climatically induced changes in thickness and extent.

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Corresponding author

*Corresponding author.E-mail addresses: nfg@aber.ac.uk (N.F. Glasser), krister@natgeo.su.se (K.N. Jansson).

References

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