Ice flow dynamics and mass loss of Totten Glacier, East Antarctica, from 1989 to 2015

Totten Glacier has the largest ice discharge in East Antarctica and a basin grounded mostly below sea level. Satellite altimetry data have revealed ice thinning in areas of fast flow. Here we present a time series of ice velocity measurements spanning from 1989 to 2015 using Landsat and interferomet...

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Veröffentlicht in:Geophysical research letters Jg. 43; H. 12; S. 6366 - 6373
Hauptverfasser: Li, Xin, Rignot, Eric, Mouginot, Jeremie, Scheuchl, Bernd
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Washington John Wiley & Sons, Inc 28.06.2016
Wiley
Schlagworte:
Acceleration
Antarctica
Atmospherics
Climate
Climate models
Constants
Discharge
Dynamics
Geophysics
Glaciers
Ice
Ice cover
ice discharge
Ice thickness
Interferometry
Landsat
Landsat satellites
Marine
Mass
mass budget
Ocean temperature
Oceans
Radar
Radar data
Remote sensing
Satellite altimetry
Satellites
Sea level
Synthetic aperture radar
Temperature
Temperature effects
Thinning
Totten Glacier
Velocity
PSE, Antarctica, East Antarctica
ISSN:0094-8276, 1944-8007
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Zusammenfassung:Totten Glacier has the largest ice discharge in East Antarctica and a basin grounded mostly below sea level. Satellite altimetry data have revealed ice thinning in areas of fast flow. Here we present a time series of ice velocity measurements spanning from 1989 to 2015 using Landsat and interferometric synthetic‐aperture radar data, combined with ice thickness from Operation IceBridge, and surface mass balance from Regional Atmospheric Climate Model. We find that the glacier speed exceeded its balance speed in 1989–1996, slowed down by 11 ± 12% in 2000 to bring its ice flux in balance with accumulation (65 ± 4 Gt/yr), then accelerated by 18 ± 3% until 2007, and remained constant thereafter. The average ice mass loss (7 ± 2 Gt/yr) is dominated by ice dynamics (73%). Its acceleration (0.6 ± 0.3 Gt/yr2) is dominated by surface mass balance (80%). Ice velocity apparently increased when ocean temperature was warmer, which suggests a linkage between ice dynamics and ocean temperature. Key Points First compilation of 26 year ice discharge to quantify the impact of ice dynamics on Totten Glacier Ice dynamics has changed significantly over the last decade and contributed to glacier mass loss Totten Glacier may be more sensitive to ocean temperature than previously thought
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ISSN:0094-8276
1944-8007
DOI:10.1002/2016GL069173