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|a Holocene thinning of the Greenland ice sheet |h [electronic resource] |y English. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2009-09. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a On entering an era of global warming, the stability of the
Greenland ice sheet (GIS) is an important concern, especially in
the light of new evidence of rapidly changing flow and melt conditions
at the GIS margins. Studying the response of the GIS to
past climatic change may help to advance our understanding of
GIS dynamics. The previous interpretation of evidence from stable
isotopes (d18O) in water from GIS ice cores was that Holocene
climate variability on the GIS differed spatially and that a consistent
Holocene climate optimum—the unusually warm period
from about 9,000 to 6,000 years ago found in many northernlatitude
palaeoclimate records—did not exist. Here we extract
both the Greenland Holocene temperature history and the evolution
of GIS surface elevation at four GIS locations. We achieve this
by comparing d18O from GIS ice cores with d18O from ice cores
fromsmall marginal icecaps. Contrary to the earlier interpretation
of d18O evidence from ice cores, our new temperature history
reveals a pronounced Holocene climatic optimum in Greenland
coinciding with maximum thinning near the GIS margins. Our
d18O-based results are corroborated by the air content of ice cores,
a proxy for surface elevation. State-of-the-art ice sheet models are
generally found to be underestimating the extent and changes in
GIS elevation and area; our findings may help to improve the ability
of models to reproduce the GIS response to Holocene climate |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062070/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/70/00001/FI15062070_thm.jpg |
