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TitleGlacier velocities and dynamic discharge from the ice masses of Baffin Island and Bylot Island, Nunavut, Canada
Authorvan Wychen, W; Copland, L; Burgess, D O; Gray, L; Shaffer, N
SourceCanadian Journal of Earth Sciences vol. 52, 2015 p. 980-989,
Alt SeriesEarth Sciences Sector, Contribution Series 20150077
PublisherNRC Research Press
Mediapaper; on-line; digital
File formatpdf
NTS38C; 38B; 38A; 37G; 37H; 37E; 27F; 27G; 27A; 27B; 27C; 16L; 16K; 26J; 26O; 26P; 26I
AreaBaffin Island
Lat/Long WENS -83.0000 -60.0000 74.0000 60.0000
Subjectsglaciers; glacial features; glaciology; glacial surges; remote sensing; radar imagery; radar methods; ice thickness; discharge rates; ice flow; Penny ice cap; Bylot Island; glacial velocities
Illustrationslocation maps; satellite images; tables; graphs
ProgramEssential Climate Variable Monitoring, Climate Change Geoscience
AbstractSpeckle tracking of ALOS PALSAR fine beam data from 2007-2011 is used to determine the surface motion of the major ice masses of Baffin and Bylot Islands in the southern Canadian Arctic. Glacier velocities are low overall, with peaks of ~100 m a-1 and mean of ~20-60 m a-1. Peak velocities on Penny and Bylot Island ice caps tend to occur near the mid-sections of their primary outlet glaciers, while the fastest velocities on all other glaciers usually occur near their termini due to relatively large accumulation areas draining through narrow outlets. Estimates of ice thickness at the fronts of tidewater terminating glaciers are combined with the velocity measurements to determine a regional iceberg discharge of between 0.011 Gt a-1 and 0.148 Gt a-1, with a best estimate of 0.050 Gt a-1, revising downward previous estimates. These glacier velocities can be used as inputs for glacier flow models, and provide a baseline dataset against which future changes in ice dynamics can be detected.
Summary(Plain Language Summary, not published)
In this study we present the first maps of surface ice motion for the major ice masses of Baffin and Bylot Islands. These glacier velocities are used to produce a best estimate of ice loss via dynamic discharge of 0.77 Gt per yr. The surface ice velocities derived in this study can be used as baseline data from which future dynamics change can be detected an as inputs of glacier modeling exercises.