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| Titel |
On the influence of model physics on simulations of Arctic and Antarctic sea ice |
| VerfasserIn |
F. Massonnet, T. Fichefet, H. Goosse, M. Vancoppenolle, P. Mathiot, C. König Beatty |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 5, no. 3 ; Nr. 5, no. 3 (2011-09-02), S.687-699 |
| Datensatznummer |
250002598
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| Publikation (Nr.) |
 copernicus.org/tc-5-687-2011.pdf |
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| Zusammenfassung |
| Two hindcast (1983–2007) simulations are performed with the global,
ocean-sea ice models NEMO-LIM2 and NEMO-LIM3 driven by atmospheric
reanalyses and climatologies. The two simulations differ only in their sea
ice component, while all other elements of experimental design (resolution,
initial conditions, atmospheric forcing) are kept identical. The main
differences in the sea ice models lie in the formulation of the subgrid-scale
ice thickness distribution, of the thermodynamic processes, of the sea ice
salinity and of the sea ice rheology. To assess the differences in model
skill over the period of investigation, we develop a set of metrics for both
hemispheres, comparing the main sea ice variables (concentration, thickness
and drift) to available observations and focusing on both mean state and
seasonal to interannual variability. Based upon these metrics, we discuss the
physical processes potentially responsible for the differences in model
skill. In particular, we suggest that (i) a detailed representation of the
ice thickness distribution increases the seasonal to interannual variability
of ice extent, with spectacular improvement for the simulation of the recent
observed summer Arctic sea ice retreats, (ii) the elastic-viscous-plastic
rheology enhances the response of ice to wind stress, compared to the
classical viscous-plastic approach, (iii) the grid formulation and the
air-sea ice drag coefficient affect the simulated ice export through Fram
Strait and the ice accumulation along the Canadian Archipelago, and (iv) both
models show less skill in the Southern Ocean, probably due to the low quality
of the reanalyses in this region and to the absence of important small-scale
oceanic processes at the models' resolution (~1°). |
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