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| Titel |
Laurentide Ice Sheet surging as modeled with PISM |
| VerfasserIn |
Florian Ziemen, Andreas Chlond, Christian Rodehacke, Uwe Mikolajewicz |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039500
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| Zusammenfassung |
| The climate during the last glacial showed a much higher variability compared to the
holocene. The strongest variations were caused by Heinrich events with a reoccurence
interval of 7 000 yrs. They are manifested in ice rafted debris layers in North Atlantic
sediment cores. The debris stems mainly from the Laurentide Ice Sheet (LIS), which has
experienced massive surges.
We use the Parallel Ice Sheet Model (PISM) to study these events; this model combines
the traditional Shallow Ice Approximation (SIA) for non-sliding ice with the Shallow Shelf
Approximation (SSA) for the sliding portions of the ice sheet and thus allows for a more
realistic representation of the sliding areas as well as the transitions between deforming and
sliding parts of the ice sheet.
We show how the surging of the LIS depends on the climate state and how it is influenced
by the basal sliding parameterization. One parameterization we employ makes
use of the perfectly plastic till assumption, which cannot be applied in SIA-only
models. |
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