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| Titel |
A high-resolution ocean and sea-ice modelling system for the Arctic and North Atlantic oceans |
| VerfasserIn |
F. Dupont, S. Higginson, R. Bourdallé-Badie, Y. Lu, F. Roy, G. C. Smith, J.-F. Lemieux, G. Garric, F. Davidson |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2015-05-28), S.1577-1594 |
| Datensatznummer |
250116351
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| Publikation (Nr.) |
 copernicus.org/gmd-8-1577-2015.pdf |
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| Zusammenfassung |
| As part of the CONCEPTS (Canadian Operational Network of Coupled
Environmental PredicTion Systems) initiative, a high-resolution
(1/12°) ice–ocean regional model is developed covering the North
Atlantic and the Arctic oceans. The long-term objective is to provide Canada
with short-term ice–ocean predictions and hazard warnings in ice-infested
regions. To evaluate the modelling component (as opposed to the analysis –
or data-assimilation – component, which is not covered in this
contribution), a series of hindcasts for the period 2003–2009 is carried
out, forced at the surface by the Canadian GDPS reforecasts (Smith et al., 2014). These
hindcasts test how the model represents upper ocean characteristics and ice
cover. Each hindcast implements a new aspect of the modelling or the
ice–ocean coupling. Notably, the coupling to the multi-category ice model
CICE is tested. The hindcast solutions are then assessed using a verification
package under development, including in situ and satellite ice and ocean
observations. The conclusions are as follows: (1) the model reproduces reasonably well
the time mean, variance and skewness of sea surface height; (2) the model
biases in temperature and salinity show that while the mean properties follow
expectations, the Pacific Water signature in the Beaufort Sea is weaker than
observed; (3) the modelled freshwater content of the Arctic agrees
well with observational estimates; (4) the distribution and volume of the sea
ice are shown to be improved in the latest hindcast due to modifications to
the drag coefficients and to some degree to the ice thickness distribution
available in CICE; (5) nonetheless, the model still overestimates the
ice drift and ice thickness in the Beaufort Gyre. |
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