Widespread low rates of Antarctic glacial isostatic adjustment revealed by GPS observations

被引:93
|
作者
Thomas, Ian D. [1 ]
King, Matt A. [1 ]
Bentley, Michael J. [2 ]
Whitehouse, Pippa L. [2 ]
Penna, Nigel T. [1 ]
Williams, Simon D. P. [3 ]
Riva, Riccardo E. M. [4 ]
Lavallee, David A. [1 ,5 ]
Clarke, Peter J. [1 ]
King, Edward C. [6 ]
Hindmarsh, Richard C. A. [6 ]
Koivula, Hannu [7 ]
机构
[1] Newcastle Univ, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[2] Univ Durham, Dept Geog, Durham DH1 3LE, England
[3] Natl Oceanog Ctr, Liverpool L3 5DA, Merseyside, England
[4] Delft Univ Technol, Delft Inst Earth Observat & Space Syst, NL-2629 HS Delft, Netherlands
[5] David Lavallee Geosci, Katy, TX USA
[6] British Antarctic Survey, Cambridge CB3 0ET, England
[7] Finnish Geodet Inst, FI-02430 Masala, Finland
关键词
WEDDELL SEA EMBAYMENT; ICE-AGE EARTH; SHEET; STABILITY; PENINSULA; MAXIMUM; GRACE; GREENLAND; HISTORY; IMPACT;
D O I
10.1029/2011GL049277
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Bedrock uplift in Antarctica is dominated by a combination of glacial isostatic adjustment (GIA) and elastic response to contemporary mass change. Here, we present spatially extensive GPS observations of Antarctic bedrock uplift, using 52% more stations than previous studies, giving enhanced coverage, and with improved precision. We observe rapid elastic uplift in the northern Antarctic Peninsula. After considering elastic rebound, the GPS data suggests that modeled or empirical GIA uplift signals are often over-estimated, particularly the magnitudes of the signal maxima. Our observation that GIA uplift is misrepresented by modeling (weighted root-mean-squares of observation-model differences: 4.9-5.0 mm/yr) suggests that, apart from a few regions where large ice mass loss is occurring, the spatial pattern of secular ice mass change derived from Gravity Recovery and Climate Experiment (GRACE) data and GIA models may be unreliable, and that several recent secular Antarctic ice mass loss estimates are systematically biased, mainly too high. Citation: Thomas, I. D., et al. (2011), Widespread low rates of Antarctic glacial isostatic adjustment revealed by GPS observations, Geophys. Res. Lett., 38, L22302, doi: 10.1029/2011GL049277.
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页数:6
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