ICESat's new perspective on ice shelf rifts: The vertical dimension

Details ICESat's new perspective on ice shelf rifts: The vertical dimension ICESat's new perspective on ice shelf rifts: The vertical dimension

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3223s08f&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 23, CiteID L23S08

Physics

4

Cryosphere: Instruments And Techniques, Cryosphere: Glaciology (1621, 1827, 1863), Cryosphere: Ice Shelves

Scientific paper

The small footprint (~70 m) and ~172 m along-track spacing of the Geoscience Laser Altimeter System (GLAS) on the Ice, Cloud and land Elevation Satellite (ICESat) provides unprecedented horizontal resolution for a satellite altimeter. This enables ICESat to map many previously unresolved features on ice shelves, such as crevasses, rifts, grounding zones and ice fronts. We present examples of ICESat-derived elevation data showing topography over rifts on the Amery and Ross ice shelves, widths of rifts and as estimates of the thickness of mélange (a collection of ice and snow trapped inside the rifts). We show that mélange thickness remains constant over the ICESat data period and tends to be thicker in older rifts. We validate the ICESat-derived mélange depth estimate with an in situ measurement on the Ross Ice Shelf.

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