Rapid loss of the Ayles Ice Shelf, Ellesmere Island, Canada

Details Rapid loss of the Ayles Ice Shelf, Ellesmere Island, Canada Rapid loss of the Ayles Ice Shelf, Ellesmere Island, Canada

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3421501c&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 21, CiteID L21501

Physics

5

Global Change: Cryospheric Change (0776), Cryosphere: Ice Shelves, Cryosphere: Sea Ice (4540), Geographic Location: Arctic Region (0718, 4207), Cryosphere: Remote Sensing

Scientific paper

On August 13, 2005, almost the entire Ayles Ice Shelf (87.1 km2) calved off within an hour and created a new 66.4 km2 ice island in the Arctic Ocean. This loss of one of the six remaining Ellesmere Island ice shelves reduced their overall area by ~7.5%. The ice shelf was likely weakened prior to calving by a long-term negative mass balance related to an increase in mean annual temperatures over the past 50+ years. The weakened ice shelf then calved during the warmest summer on record in a period of high winds, record low sea ice conditions and the loss of a semi-permanent landfast sea ice fringe. Climate reanalysis suggests that a threshold of >200 positive degree days year-1 is important in determining when ice shelf calving events occur on N. Ellesmere Island.

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