Decadal GPS-derived ice surface velocity along the transect from Zhongshan Station to and around Dome Argus, East Antarctica, 2005–16

Using repeat GPS measurements during 2005–16, we calculated and updated two-dimensional high-resolution decadal ice surface velocity estimates along the traverse route from Zhongshan Station to and around Dome Argus, East Antarctica. Along the 71 sites of the transect, the magnitudes of ice velocity...

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Bibliographic Details
Published inAnnals of glaciology Vol. 59; no. 76pt1; pp. 1 - 9
Main Authors Yuande, Yang, Hao, Ke, Zemin, Wang, Fei, Li, Minghu, Ding, Bo, Sun, Bo, Jin, Lianzhong, Wang, Songtao, Ai
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.07.2018
Subjects
Antarctic glaciology
Climate change
Data processing
Domes
Dynamics
Earth science
Estimates
Fieldwork
Glaciers
Global positioning systems
GPS
Ground truth
High resolution
Ice
Ice sheets
ice velocity
Interferometric synthetic aperture radar
Interferometry
Radar
remote sensing
Resolution
SAR (radar)
Satellite navigation systems
Sea level
Snow
Surface velocity
Synthetic aperture radar
Synthetic aperture radar interferometry
Topography
Velocity
Antarctica
ice velocity
remote sensing
Antarctic glaciology
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Summary:Using repeat GPS measurements during 2005–16, we calculated and updated two-dimensional high-resolution decadal ice surface velocity estimates along the traverse route from Zhongshan Station to and around Dome Argus, East Antarctica. Along the 71 sites of the transect, the magnitudes of ice velocity increased from near 0 in Dome Argus to 1, 10 and ~100 m a−1 at the sites DT416, DT333 and LT980, respectively. The comparison between GPS and interferometric synthetic aperture radar (InSAR) derived results agree well when the magnitude of the ice surface velocities is faster than 5 m a−1, and disagree for slower flow velocities. A scale value 1.15 and 0.12 can be applied to InSAR derived results over this region with ice surface velocity larger and <5 m a−1, respectively. We attributed the cause of the discrepancy to the insensitivity of InSAR to the magnitude of low ice surface velocities, thus confirming the importance of GPS fieldwork-based ground truth high-resolution ice velocity estimates to constrain ice-sheet dynamics.
ISSN:0260-3055
1727-5644
DOI:10.1017/aog.2018.3