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|a South Greenland ice-sheet collapse during Marine Isotope Stage 11 |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2014. |
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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 Varying levels of boreal summer insolation and associated Earth
system feedbacks led to differing climate and ice-sheet states during
late-Quaternary interglaciations. In particular, Marine Isotope
Stage (MIS) 11 was an exceptionally long interglaciation and potentially
had a global mean sea level 6 to 13 metres above the present
level around410,000 to 400,000 years ago, implying substantial mass
loss fromtheGreenland ice sheet (GIS).There are, however, nomodel
simulations and only limitedproxy data, to constrain themagnitude
of the GIS response to climate change during this ‘super interglacial’
5, thus confounding efforts to assess climate/ice-sheet threshold
behaviour and associated sea-level rise1. Here we show that the
south GIS was drastically smaller during MIS 11 than it is now, with
only a small residual ice dome over southernmost Greenland. We
use the strontium–neodymium–lead isotopic composition of proglacial
sediment discharged from south Greenland to constrain the
provenance of terrigenous silt deposited on the Eirik Drift, a sedimentary
depositoff the southGreenlandmargin.We identify amajor
reduction in sediment input derived from south Greenland’s Precambrian
bedrock terranes, probably reflecting the cessation of subglacial
erosion and sediment transport as a result of near-complete
deglaciation of south Greenland. Comparison with ice-sheet configurations
from numerical models,9–12 suggests that the GIS lost
about 4.5 to 6 metres of sea-level-equivalent volume during MIS 11.
This is evidence for late-Quaternary GIS collapse after it crossed a
climate/ice-sheet stability threshold thatmayhave beennomore than
several degrees above pre-industrial temperature |
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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 Geographic Information Systems. |
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|t South Greenland ice-sheet collapse during Marine Isotope Stage 11 |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062093/00001 |y Click here for full text |
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|3 FULL TEXT- South Greenland ice-sheet collapse during Marine Isotope Stage 11 |u https://www.nature.com/nature/journal/v510/n7506/full/nature13456.html |y South Greenland ice-sheet collapse during Marine Isotope Stage 11 |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/93/00001/FI15062093_thm.jpg |