Iceberg calving during transition from grounded to floating ice: Columbia Glacier, Alaska

Details Iceberg calving during transition from grounded to floating ice: Columbia Glacier, Alaska Iceberg calving during transition from grounded to floating ice: Columbia Glacier, Alaska

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3715501w&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 15, CiteID L15501

Physics

6

Cryosphere: Glaciers, Cryosphere: General Or Miscellaneous, Cryosphere: Dynamics, Cryosphere: Ice Streams, Cryosphere: Ice Shelves

Scientific paper

The terminus of Columbia Glacier, Alaska, unexpectedly became ungrounded in 2007 during its prolonged retreat. Visual observations showed that calving changed from a steady release of low-volume bergs, to episodic flow-perpendicular rifting, propagation, and release of very large icebergs - a style reminiscent of calving from ice shelves. Here, we compare passive seismic and photographic observations through this transition to examine changes in calving. Mechanical changes accompany the visible changes in calving style post flotation: generation of seismic energy during calving is substantially reduced. We propose this is partly due to changes in source processes.

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