Grounding line migration of Petermann Gletscher, north Greenland, detected using satellite radar interferometry
Ice Sheet grounding lines are sensitive indicators of changes in ice thickness, sea level or elevation of the sea bed. Here, we use the synthetic-aperture radar try technique to detect the migration of the limit of tidal flexing, or hinge line, of Petermann a major outlet glacier of north Greenland...
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| Format: | Text |
| Language: | English |
| Published: |
1997
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.32.6211 http://techreports.jpl.nasa.gov/1997/97-1485.pdf |
| Summary: | Ice Sheet grounding lines are sensitive indicators of changes in ice thickness, sea level or elevation of the sea bed. Here, we use the synthetic-aperture radar try technique to detect the migration of the limit of tidal flexing, or hinge line, of Petermann a major outlet glacier of north Greenland which develops an extensive floating tongue. Radar are generated over that glacier to measure its tidal deformation in response to ocean tide. The data are projected onto a common polar stereographic grid and co-registered to a reference radar scene with a precision of 5 m using the cross-correlation of the signal intensity. each the hinge line is mapped automatically with a precision of 30 m across the entire glacier width using a model from an elastic beam theory. The root-mean-square error of the model fit is less than 3 mm. Migration of the hinge line is subsequently detected with a precision of 40 m. Over periods of a few days to a few months, we observe a hinge line migration of 40 to. |
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