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Permanent link (DOI): https://doi.org/10.7939/R3HS5B

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Ice-atmosphere interactions in the Canadian high Arctic: implications for the thermo-mechanical evolution of terrestrial ice masses Open Access

Descriptions

Other title
Subject/Keyword
mass balance
atmosphere
glacier
albedo
temperature
feedbacks
ice
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wohlleben, Trudy Monique Heidi
Supervisor and department
Bush, Andrew (Earth and Atmospheric Sciences)
Sharp, Martin (Earth and Atmospheric Sciences)
Examining committee member and department
England, John (Earth and Atmospheric Sciences)
Sutherland, Bruce (Physics) and (Earth and Atmospheric Sciences)
Flato, Greg (Canadian Centre for Climate Modelling and Analysis, Environment Canada, Victoria)
Sharp, Martin (Earth and Atmospheric Sciences)
Swaters, Gordon (Mathematical and Statistical Sciences)
Bush, Andrew (Earth and Atmospheric Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2009-05-29T16:12:15Z
Graduation date
2009-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Canadian High Arctic terrestrial ice masses and the polar atmosphere evolve co-dependently, and interactions between the two systems can lead to feedbacks, positive and negative. The two primary positive cryosphere-atmosphere feedbacks are: 1) The snow/ice-albedo feedback (where area changes in snow and/or ice cause changes in surface albedo and surface air temperatures, leading to further area changes in snow/ice); and 2) The elevation - mass balance feedback (where thickness changes in terrestrial ice masses cause changes to atmospheric circulation and precipitation patterns, leading to further ice thickness changes). In this thesis, numerical experiments are performed to: 1) quantify the magnitudes of the two feedbacks for chosen Canadian High Arctic terrestrial ice masses; and 2) to examine the direct and indirect consequences of surface air temperature changes upon englacial temperatures with implications for ice flow, mass flux divergence, and topographic evolution. Model results show that: a) for John Evans Glacier, Ellesmere Island, the magnitude of the terrestrial snow/ice-albedo feedback can locally exceed that of sea ice on less than decadal timescales, with implications for glacier response times to climate perturbations; b) although historical air temperature changes might be the direct cause of measured englacial temperature anomalies in various glacier and ice cap accumulation zones, they can also be the indirect cause of their enhanced diffusive loss; c) while the direct result of past air temperature changes has been to cool the interior of John Evans Glacier, and its bed, the indirect result has been to create and maintain warm (pressure melting point) basal temperatures in the ablation zone; and d) for Devon Ice Cap, observed mass gains in the northwest sector of the ice cap would be smaller without orographic precipitation and the mass balance – elevation feedback, supporting the hypothesis that this feedback is playing a role in the evolution of the ice cap.
Language
English
DOI
doi:10.7939/R3HS5B
Rights
License granted by Trudy Wohlleben (tmw2@ualberta.ca) on 2009-05-28T23:35:19Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: University of Alberta
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