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Proglacial Lakes Control Glacier Geometry and Behavior During Recession / J. L. Sutherland, J. L. Carrivick, N. Gandy, J. Shulmeister, D. J. Quincey, Stephen Cornford

Geophysical Research Letters, Volume: 47, Issue: 19

Swansea University Author: Stephen Cornford

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DOI (Published version): 10.1029/2020gl088865

Abstract

Ice‐contact proglacial lakes are generally absent from numerical model simulations of glacierevolution, and their effects on ice dynamics and on rates of deglaciation remain poorly quantified. Usingthe BISICLES iceflow model, we analyzed the effects of an ice‐contact lake on the Pukaki Glacier,New Z...

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Published in: Geophysical Research Letters
ISSN: 0094-8276 1944-8007
Published: American Geophysical Union (AGU) 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa56309
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Abstract: Ice‐contact proglacial lakes are generally absent from numerical model simulations of glacierevolution, and their effects on ice dynamics and on rates of deglaciation remain poorly quantified. Usingthe BISICLES iceflow model, we analyzed the effects of an ice‐contact lake on the Pukaki Glacier,New Zealand, during recession from the Last Glacial Maximum. The ice‐contact lake produced a maximumeffect on grounding line recession >4 times further and on ice velocities up to 8 times faster, compared tosimulations of a land‐terminating glacier forced by the same climate. The lake contributed up to 82% ofcumulative grounding line recession and 87% of ice velocity during thefirst 300 years of the simulations,but those values decreased to just 6% and 37%, respectively, after 5,000 years. Numerical models that ignorelake interactions will, therefore, misrepresent the rate of recession especially during the transition of aland‐terminating to a lake‐terminating environment.
College: College of Science
Issue: 19