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| Titel |
A dynamic continental runoff routing model applied to the last Northern Hemisphere deglaciation |
| VerfasserIn |
H. Goelzer, I. Janssens, J. Nemec, P. Huybrechts |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 3 ; Nr. 5, no. 3 (2012-05-09), S.599-609 |
| Datensatznummer |
250002608
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| Publikation (Nr.) |
 copernicus.org/gmd-5-599-2012.pdf |
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| Zusammenfassung |
| We describe and evaluate a dynamical continental runoff routing model for
the Northern Hemisphere that calculates the runoff pathways in response to
topographic modifications due to changes in ice thickness and isostatic
adjustment. The algorithm is based on the steepest gradient method and takes
as simplifying assumption that depressions are filled at all times and water
drains through the lowest outlet points. It also considers changes in water
storage and lake drainage in post-processing mode that become important in
the presence of large ice dammed proglacial lakes. Although applicable to
other scenarios as well, the model was conceived to study the routing of
freshwater fluxes during the last Northern Hemisphere deglaciation. For that
specific application we simulated the Northern Hemisphere ice sheets with an
existing 3-D thermomechanical ice sheet model, which calculates changes in
topography due to changes in ice cover and isostatic adjustment, as well as
the evolution of freshwater fluxes resulting from surface ablation, iceberg
calving and basal melt. The continental runoff model takes this input,
calculates the drainage pathways and routes the freshwater fluxes to the
surface grid points of an existing ocean model. This results in a chronology
of temporally and spatially varying freshwater fluxes from the Last Glacial
Maximum to the present day. We analyse the dependence of the runoff routing
to grid resolution and parameters of the isostatic adjustment module of the
ice sheet model. |
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