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Detailed Reference Information |
Wahr, J., van Dam, T., Larson, K. and Francis, O. (2001). GPS measurements of vertical crustal motion in Greenland. Journal of Geophysical Research 106: doi: 10.1029/2001JD900154. issn: 0148-0227. |
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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. ¿ 2001 American Geophysical Union |
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Abstract |
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Keywords
Geodesy and Gravity, Crustal movements—intraplate, Geodesy and Gravity, Rheology of the lithosphere and mantle, Hydrology, Hydrologic budget, Meteorology and Atmospheric Dynamics, Paleoclimatology |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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