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| Titel |
A system of conservative regridding for ice–atmosphere coupling in a General Circulation Model (GCM) |
| VerfasserIn |
R. Fischer, S. Nowicki, M. Kelley, G. A. Schmidt |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2014-05-19), S.883-907 |
| Datensatznummer |
250115620
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| Publikation (Nr.) |
 copernicus.org/gmd-7-883-2014.pdf |
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| Zusammenfassung |
The method of elevation classes, in which the ice surface model is run at
multiple elevations within each grid cell, has proven to be a useful way for
a low-resolution atmosphere inside a general circulation model (GCM) to produce
high-resolution downscaled surface mass balance fields for use in
one-way studies coupling atmospheres and ice flow models. Past uses of
elevation classes have failed to conserve mass and
energy because the transformation used to regrid to the atmosphere was
inconsistent with the transformation used to downscale to the ice model.
This would cause
problems for two-way coupling.
A strategy that resolves this conservation issue has been designed
and is presented here. The approach identifies three grids between
which data must be regridded and five transformations between those
grids required by a typical coupled atmosphere–ice flow model. This paper
develops a theoretical framework for the problem and
shows how each of these transformations may be achieved in
a consistent, conservative manner. These transformations are
implemented in Glint2, a library used to couple atmosphere models with ice
models. Source code and documentation are available for
download. Confounding real-world issues are discussed, including the
use of projections for ice modeling, how to handle dynamically
changing ice geometry, and modifications required for finite element
ice models. |
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