Journal article
Resolving Seasonal Ice Velocity of 45 Greenlandic Glaciers With Very High Temporal Details
Geodesy, National Space Institute, Technical University of Denmark1
National Space Institute, Technical University of Denmark2
Microwaves and Remote Sensing, National Space Institute, Technical University of Denmark3
Geological Survey of Denmark and Greenland4
University of Colorado Boulder5
University of Copenhagen6
Seasonal glacier ice velocities are important for understanding controlling mechanisms of ice flow. For many Greenlandic glaciers, however, these measurements are limited by low temporal resolution. We present seasonal ice velocity changes, melt season onset and extent, and ice front positions for 45 Greenlandic glaciers using 2015–2017 Sentinel-1 synthetic aperture radar data.
Seasonal velocity fluctuations of roughly half of the glaciers appear to be primarily controlled by surface melt-induced changes in the subglacial hydrology. This includes (1) glaciers that speed up with the onset of surface melt and (2) glaciers with comparable late winter and early melt season velocities that show significant slowdown during most of the melt season and speedup during winter.
In contrast, less than a quarter of the study glaciers show strong correspondence between seasonal ice speed and terminus changes. Our results pinpoint seasonal variations across Greenland, highlighting the variable influence of meltwater on year-round ice velocities.
Language: | English |
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Year: | 2019 |
Pages: | 1485-1495 |
ISSN: | 19448007 and 00948276 |
Types: | Journal article |
DOI: | 10.1029/2018GL081503 |
ORCIDs: | 0000-0002-4919-792X , 0000-0002-8970-9213 , Khan, Shfaqat Abbas and Kusk, Anders |