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| Titel |
Plankton bloom controlled by horizontal stirring |
| VerfasserIn |
W. McKiver, Z. Neufeld, I. Scheuring |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 16, no. 5 ; Nr. 16, no. 5 (2009-10-30), S.623-630 |
| Datensatznummer |
250013268
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| Publikation (Nr.) |
 copernicus.org/npg-16-623-2009.pdf |
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| Zusammenfassung |
| Here we show a simple mechanism in which changes in the rate of
horizontal stirring by mesoscale ocean eddies can trigger or
suppress plankton blooms and can lead to an abrupt change in the
average plankton density. We consider a single species phytoplankton
model with logistic growth, grazing and a spatially non-uniform
carrying capacity. The local dynamics have multiple steady states
for some values of the carrying capacity that can lead to localized
blooms as fluid moves across the regions with different properties.
We show that for this model even small changes in the ratio of
biological timescales relative to the flow timescales can greatly
enhance or reduce the global plankton productivity. Thus, this may
be a possible mechanism in which changes in horizontal mixing can
trigger plankton blooms or cause regime shifts in some oceanic
regions. Comparison between the spatially distributed model and
Lagrangian simulations considering temporal fluctuations along fluid
trajectories, demonstrates that small scale transport processes also
play an important role in the development of plankton blooms with a
significant influence on global biomass. |
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