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Glacier velocities and dynamic ice discharge from the Queen Elizabeth Islands, Nunavut, Canada
Author(s) -
Van Wychen Wesley,
Burgess David O.,
Gray Laurence,
Copland Luke,
Sharp Martin,
Dowdeswell Julian A.,
Benham Toby J.
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2013gl058558
Subject(s) - glacier , surge , arctic , archipelago , climatology , geology , ice stream , glacier ice accumulation , groenlandia , arctic ice pack , physical geography , oceanography , cryosphere , antarctic sea ice , sea ice , ice sheet , geography , geomorphology
Recent studies indicate an increase in glacier mass loss from the Canadian Arctic Archipelago as a result of warmer summer air temperatures. However, no complete assessment of dynamic ice discharge from this region exists. We present the first complete surface velocity mapping of all ice masses in the Queen Elizabeth Islands and show that these ice masses discharged ~2.6 ± 0.8 Gt a −1 of ice to the oceans in winter 2012. Approximately 50% of the dynamic discharge was channeled through non surge‐type Trinity and Wykeham Glaciers alone. Dynamic discharge of the surge‐type Mittie Glacier varied from 0.90 ± 0.09 Gt a −1 during its 2003 surge to 0.02 ± 0.02 Gt a −1 during quiescence in 2012, highlighting the importance of surge‐type glaciers for interannual variability in regional mass loss. Queen Elizabeth Islands glaciers currently account for ~7.5% of reported dynamic discharge from Arctic ice masses outside Greenland.