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| Titel |
Mechanisms controlling primary and new production in a global ecosystem model – Part I: Validation of the biological simulation |
| VerfasserIn |
E. E. Popova, A. C. Coward, G. A. Nurser, B. Cuevas, M. J. R. Fasham, T. R. Anderson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 2, no. 2 ; Nr. 2, no. 2 (2006-12-06), S.249-266 |
| Datensatznummer |
250000519
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| Publikation (Nr.) |
 copernicus.org/os-2-249-2006.pdf |
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| Zusammenfassung |
| A global general circulation model coupled to a simple six-compartment ecosystem
model is used to study the extent to which global variability in primary and
export production can be realistically predicted on the basis of advanced
parameterizations of upper mixed layer physics, without recourse to introducing
extra complexity in model biology. The "K profile parameterization" (KPP) scheme
employed, combined with 6-hourly external forcing, is able to capture short-term
periodic and episodic events such as diurnal cycling and storm-induced deepening. The model
realistically reproduces various features of global ecosystem dynamics that have
been problematic in previous global modelling studies, using a single generic
parameter set. The realistic simulation of deep convection in the North Atlantic,
and lack of it in the North Pacific and Southern Oceans, leads to good predictions
of chlorophyll and primary production in these contrasting areas. Realistic
levels of primary production are predicted in the oligotrophic gyres due to high frequency external
forcing of the upper mixed layer (accompanying paper Popova et al., 2006) and
novel parameterizations of zooplankton excretion.
Good agreement is shown between model and observations at various JGOFS time series sites: BATS,
KERFIX, Papa and HOT. One exception is the northern North Atlantic where lower grazing rates are
needed, perhaps related to the dominance of mesozooplankton there. The model is therefore not globally robust in the sense that additional
parameterizations are needed to realistically simulate ecosystem dynamics in the
North Atlantic. Nevertheless, the work emphasises the need to pay particular
attention to the parameterization of mixed layer physics in global ocean ecosystem
modelling as a prerequisite to increasing the complexity of ecosystem models. |
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