England, J. H. and Lakeman, T. R. and Lemmen, D. S. and Bednarski, J. M. and Stewart, T. G. and Evans, D. J. A. (2008) 'A millennial-scale record of Arctic Ocean sea ice variability and the demise of the Ellesmere Island ice shelves.', Geophysical research letters., 35 .
Sea-ice ice shelves, at the apex of North America (>80N), constitute the oldest sea ice in the Northern Hemisphere. We document the establishment and subsequent stability of the Ward Hunt Ice Shelf, and multiyear landfast sea ice in adjacent fiords, using 69 radiocarbon dates obtained on Holocene driftwood deposited prior to coastal blockage. These dates (47 of which are new) record a hiatus in driftwood deposition beginning 5500 cal yr BP, marking the inception of widespread multiyear landfast sea ice across northern Ellesmere Island. This chronology, together with historical observations of ice shelf breakup (1950 to present), provides the only millennial-scale record of Arctic Ocean sea ice variability to which the past three decades of satellite surveillance can be compared. Removal of the remaining ice shelves would be unprecedented in the last 5500 years. This highlights the impact of ongoing 20th and 21st century climate warming that continues to break up the remaining ice shelves and soon may cause historically ice-filled fiords nearby to open seasonally.
|Keywords:||Ice shelves, Sea ice, Arctic Ocean.|
|Full text:||PDF - Published Version (502Kb)|
|Publisher Web site:||http://dx.doi.org/10.1029/2008GL034470|
|Publisher statement:||© 2008 American Geophysical Union. England, J. H. and Lakeman, T. R. and Lemmen, D. S. and Bednarski, J. M. and Stewart, T. G. and Evans, D. J. A.,(2008) A millennial-scale record of Arctic Ocean sea ice variability and the demise of the Ellesmere Island ice shelves, Geophysical research letters, 35, L19502, 10.1029/2008GL034470. To view the published open abstract, go to http://dx.doi.org and enter the DOI 10.1029/2008GL034470|
|Record Created:||24 May 2010 17:05|
|Last Modified:||11 Aug 2010 15:25|
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