Response of a marine-terminating Greenland outlet glacier to abrupt cooling 8200 and 9300 years ago

Details Response of a marine-terminating Greenland outlet glacier to abrupt cooling 8200 and 9300 years ago Response of a marine-terminating Greenland outlet glacier to abrupt cooling 8200 and 9300 years ago

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3824701y&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 24, CiteID L24701

Physics

Cryosphere: Ice Sheets, Geochronology: Quaternary Geochronology, Geochronology: Cosmogenic-Nuclide Exposure Dating (4918), Global Change: Abrupt/Rapid Climate Change (4901, 8408)

Scientific paper

Long-term records of Greenland outlet-glacier change extending beyond the satellite era can inform future predictions of Greenland Ice Sheet behavior. Of particular relevance is elucidating the Greenland Ice Sheet's response to decadal- and centennial-scale climate change. Here, we reconstruct the early Holocene history of Jakobshavn Isbræ, Greenland's largest outlet glacier, using 10Be surface exposure ages and 14C-dated lake sediments. Our chronology of ice-margin change demonstrates that Jakobshavn Isbræ advanced to deposit moraines in response to abrupt cooling recorded in central Greenland ice cores ca. 8,200 and 9,300 years ago. While the rapid, dynamically aided retreat of many Greenland outlet glaciers in response to warming is well documented, these results indicate that marine-terminating outlet glaciers are also able to respond quickly to cooling. We suggest that short lag times of high ice flux margins enable a greater magnitude response of marine-terminating outlets to abrupt climate change compared to their land-terminating counterparts.

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