Greenland glacier calving rates from Extreme Ice Survey (EIS) time lapse photogrammetry
Abstract
Time lapse cameras fill gaps in our observational capabilities: 1. By providing much higher temporal resolution than offered by conventional airborne or satellite remote sensing. 2. While GPS or auto-theodolite observations may provide valuable higher time resolution data than from photogrammetry, survival of these sensors on the hazardous glacier surface is limited and maintenance costs are high. 3. Imagery provide a high spatial density of observations across the glacier surface. 4. time lapse cameras provide observational capabilities in Eulerian and Lagrangian frames while GPS or theodolite targets, going along for a ride on the glacier, provide only Lagrangian data. Photogrammetry techniques are applied to a year-plus of images from multiple west Greenland glaciers to determine the glacier front calving rates and horizontal velocity at hourly to seasonal time scales. We present an analysis of calving rates versus various environmental factors including: sea and land surface temperature; near-surface air temperature; winds; tidal stage; and motion derived from in-situ GPS.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2010
- Bibcode:
- 2010AGUFM.C23B0628J
- Keywords:
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- 0700 CRYOSPHERE;
- 0720 CRYOSPHERE / Glaciers;
- 0750 CRYOSPHERE / Sea ice;
- 0776 CRYOSPHERE / Glaciology