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The mesoscale variability of nutrients and plankton as seen in a coupled model

Die mesoskalige VariabilitÄt von NÄhrstoffen und Plankton in einem gekoppelten Modell

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Summary

The effect of the variability of mesoscale current patterns on the dynamics of nutrients and plankton is studied by means of a simple coupled model. A chemical-biological model in conjunction with a high resolution circulation model is applied to the southwestern Baltic. The biological model has four state variables; a limiting nutrient, phytoplankton, Zooplankton and detritus. The circulation model is based on an implementation of the GFDL-model in the modular version (MOM 1).

Experimental simulations of a spring bloom with the coupled model show the generation of patchiness, which is basically controlled by the mesoscale circulation patterns in conjunction with sinking of plankton and nutrient limitation. The exchange of material among the sub-basins of the model area and the differences between coupled models and scaled up box models is briefly discussed.

Zusammenfassung

Der Einflu\ mesoskaliger Strömungsmuster auf die Dynamik von NÄhrstoffen und Plankton wird mit Hilfe eines gekoppelten Modells untersucht. Dazu wird ein einfaches biologisches Modell in ein Zirkulationsmodell der südwestlichen Ostsee eingebunden. Das biologische Modell besitzt vier Zustandsgrö\en; limitierender NÄhrstoff, Phytoplankton, Zooplankton und Detritus. Als Zirkulationsmodell wird das GFDL-Modell in einer modularen Version (MOM 1) verwendet.

Experimentelle Simulationen der Frühjahrsblüte des Phytoplanktons mit dem Modell zeigen, wie rÄumlich variable Muster (phytoplankton patchiness) durch die mesoskaligen Strömungsmuster in Verbindung mit dem Absinken von Plankton und NÄhrstofflimitierung entstehen.

Der Austausch von Material zwischen den Teilbecken des Modells sowie Skalierungsaspekte in Bezug auf Boxmodelle werden kurz diskutiert.

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Authors and Affiliations

  1. Institut für Ostreeforschung Warnemünde, Seestra\e 15, 18119, Rostock-Warnemünde

    Wolfgang Fennel & Thomas Neumann

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  1. Wolfgang Fennel
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  2. Thomas Neumann
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Correspondence to Wolfgang Fennel.

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Fennel, W., Neumann, T. The mesoscale variability of nutrients and plankton as seen in a coupled model. Deutsche Hydrographische Zeitschrift 48, 49–71 (1996). https://doi.org/10.1007/BF02794052

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