A comparison of balance velocities, and InSAR-derived velocities for the Greenland Ice Sheet.
ABSTRACT: Balance velocities for the Greenland ice sheet have been calculated from a new digital elevation model, accumulation rates compilation and an existing ice thickness grid, using a two-dimensional finite difference scheme. The pattern of velocities over the ice sheet is presented and compare...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.205.1521 http://earth.esa.int/pub/ESA_DOC/fringe1999/Papers/bamber.pdf |
| Summary: | ABSTRACT: Balance velocities for the Greenland ice sheet have been calculated from a new digital elevation model, accumulation rates compilation and an existing ice thickness grid, using a two-dimensional finite difference scheme. The pattern of velocities over the ice sheet is presented and compared with velocities derived from synthetic aperture radar interferometry for part of northern Greenland and a limited number of GPS data. This comparison indicated that the balance velocity scheme and boundary conditions used here provide a remarkably good representation of the dynamics of the ice sheet inland from the margins. It is suggested, therefore, that these balance velocity data could provide a valuable method of constraining a numerical ice sheet model. The comparison also highlighted some of the limitations of using single-look interferometric pairs to derive down-slope velocities. |
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