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| Titel |
Elastic crustal uplift due to unloading of ice from the main outlet glaciers in southeast Greenland |
| VerfasserIn |
S. A. Khan, J. Wahr, G. S. Hamilton, M. Bevis, L. A. Stearns, T. van Dam |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026977
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| Zusammenfassung |
| The main outlet glaciers in Greenland have more than doubled their ice volume loss in the
past decade. Ice volume loss due to thinning of glaciers would result in a rapid
mass unloading of the earth's crust. The elastic adjustments of the lithosphere is
detectable using geodetic observations. Here, we use continuous Global Positioning
System (GPS) measurements to study vertical crustal motions. We analyze data
from 20 GPS receivers, all located along the edge of the Greenland ice sheet.
The rapid unloading of ice from the southeastern sector of the Greenland ice sheet
causes an elastic uplift of 12 mm/yr at a GPS site in Kulusuk (a settlement located
 50 km from the ice sheet margin) and 16 mm/yr at a GPS site in Isortoq (located
few km from the ice sheet margin) and 20 mm/yr at HEL2 (a GPS site near the
front of the Helheim Glacier). The GPS observations can be explained as due to
ice volume loss of 150 km^3/yr-1 due to thinning in the southeastern sector of
the Greenland ice sheet (including the Helheim glacier and the Kangerdlugssuaq
glacier). |
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