Reference : GPS measurements of vertical crustal motion in Greenland
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/760
GPS measurements of vertical crustal motion in Greenland
English
Wahr, John [Department of Physics and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder]
van Dam, Tonie mailto [European Center of Geodynamics and Seismology, Walferdange]
Larson, Kristine [Department of Aerospace Engineering Services, University of Colorado, Boulder]
Francis, Olivier mailto [European Center of Geodynamics and Seismology, Walferdange]
2001
Journal of Geophysical Research
American Geophysical Union
106
D24
33755-33759
Yes
International
0148-0227
2156-2202
[en] geodesy and gravity ; crustal movements-intraplate ; hydrological cycles and budgets ; meteorology and atmospheric dynamics ; plaeoclimatology ; rheology of the lithosphere and mantle
[en] We have analyzed 5 years of continuous Global Positioning System (GPS) measurements taken at Kellyville, just off the western margin of the ice sheet in southern Greenland. A fit to the vertical component gives a negative secular uplift rate of −5.8±1.0 mm/yr. A negative rate (i.e., a subsidence) is consistent with archeological and historical evidence that the surrounding region has been subsiding over the last 3 kyr. However, it is inconsistent with estimates of the Earth's continuing viscoelastic response to melting ice prior to 4 ka years ago, which predict that Kellyville should be uplifting, rather than subsiding, by 2.0±3.5 mm/yr. The resulting −7.8±3.6 mm/yr discrepancy is too large to be the result of loading from present-day changes in nearby ice. We show, instead, that it is consistent with independent suggestions that the western ice sheet margin in this region of Greenland may have advanced by ≈50 km during the past 3–4 kyr.
Researchers
http://hdl.handle.net/10993/760
10.1029/2001JD900154

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