Physics – Geophysics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3116404l&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 16, CiteID L16404
Physics
Geophysics
9
Exploration Geophysics: Remote Sensing, Hydrology: Glaciology (1863), Hydrology: Snow And Ice (1827), Physical Properties Of Rocks: Fracture And Flow
Scientific paper
The calving of icebergs from large Antarctic ice shelves is controlled mainly by the formation and propagation of rifts originating from the side margins of the ice shelf and local areas of grounding. Using InSAR, we observe the evolution of rifts along Hemmen Ice Rise, on Ronne Ice Shelf, Antarctica prior to the large calving event of October 1998. We couple these observations with a computer model combining the viscous flow of an ice shelf with a linear elastic fracture mechanics description of the propagation of rifts. The model reveals that the ice melange trapped in between the rifts exerts a major control on the propagation of rifts, and in turn on ice shelf stability. Melting of the ice melange from oceanic or atmospheric warming would significantly increase the propagation rate of rifts and threaten the ice-shelf stability.
Aubry Denis
Larour E.
Rignot Eric
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