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| Titel |
A skill assessment of the biogeochemical model REcoM2 coupled to the Finite Element Sea Ice–Ocean Model (FESOM 1.3) |
| VerfasserIn |
V. Schourup-Kristensen, D. Sidorenko, D. A. Wolf-Gladrow, C. Völker |
| 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. 6 ; Nr. 7, no. 6 (2014-11-25), S.2769-2802 |
| Datensatznummer |
250115784
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| Publikation (Nr.) |
 copernicus.org/gmd-7-2769-2014.pdf |
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| Zusammenfassung |
In coupled biogeochmical–ocean models, the choice of numerical schemes in
the ocean circulation component can have a large influence on the
distribution of the biological tracers. Biogeochemical models are
traditionally coupled to ocean general circulation models (OGCMs), which are
based on dynamical cores employing quasi-regular meshes, and therefore
utilize limited spatial resolution in a global setting. An alternative
approach is to use an unstructured-mesh ocean model, which allows variable
mesh resolution. Here, we present initial results of a coupling between the
Finite Element Sea Ice–Ocean Model (FESOM) and the biogeochemical model
REcoM2 (Regulated Ecosystem Model 2), with special focus on the
Southern Ocean.
Surface fields of nutrients, chlorophyll a and net primary production (NPP)
were compared to available data sets with a focus on spatial distribution and
seasonal cycle. The model produces realistic spatial distributions,
especially regarding NPP and chlorophyll a, whereas the iron concentration
becomes too low in the Pacific Ocean. The modelled NPP is
32.5 Pg C yr−1 and the export production 6.1 Pg C yr−1,
which is lower than satellite-based estimates, mainly due to excessive iron
limitation in the Pacific along with too little coastal production. The model
performs well in the Southern Ocean, though the assessment here is hindered
by the lower availability of observations. The modelled NPP is
3.1 Pg C yr−1 in the Southern Ocean and the export production
1.1 Pg C yr−1.
All in all, the combination of a circulation model on an unstructured grid
with a biogeochemical–ocean model shows similar performance to other models
at non-eddy-permitting resolution. It is well suited for studies of the
Southern Ocean, but on the global scale deficiencies in the Pacific Ocean
would have to be taken into account. |
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