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| Titel |
Simulating the Antarctic ice sheet in the Late-Pliocene warm period: PLISMIP-ANT, an ice-sheet model intercomparison project |
| VerfasserIn |
Bas De Boer, Aisling M. Dolan, Daniel J. Hill, Roderik S. W. van de Wal |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093519
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| Publikation (Nr.) |
 EGU/EGU2014-8325.pdf |
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| Zusammenfassung |
| In the context of future climate change, understanding the nature and behaviour of ice sheets
during warm intervals in Earth history is of fundamental importance. The Late-Pliocene
Warm Period (also known as the PRISM interval: 3.29 to 2.97 million years before present)
can serve as a potential analogue for projected future climates, with a global annual mean
surface-air temperature warming of 1.76 °C. Although Pliocene ice locations and surface
extents are still poorly constrained, a significant contribution to sea-level rise should be
expected from Greenland and West and, possibly, East Antarctica based on palaeo sea-level
reconstructions. Here, we present results from simulations of the Antarctic ice sheet by means
of an international Pliocene Ice Sheet Modeling Intercomparison Project (PLISMIP-ANT).
We include an overview of the different ice-sheet models used and how specific
model configurations influence the resulting Pliocene Antarctic ice sheet. For the
experiments, ice-sheet models including the shallow ice and shelf approximations have
been used to simulate the complete Antarctic domain (including grounded and
floating ice). We compare the performance of the ice-sheet models in simulating
modern control and Pliocene ice sheets by a suite of sensitivity experiments. Ice-sheet
model forcing fields are taken from the PlioMIP results incorporating multiple
coupled atmosphere-ocean general circulation models (GCM). We show that ice-sheet
models simulate a present-day ice sheet which is comparable to the observations, and
find no systematic biases introduced when using different GCM forcing relative to
observational climate forcing. This project includes multiple ice-sheet models forced
with multiple climate model output, from which a comprehensive assessment can
be made as to the uncertainties of ice-sheet extent on Antarctica. These results
may eventually serve as a new constraint on the extent of the Antarctic ice sheet
during the Late-Pliocene Warm Period for use in climate modelling experiments. |
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