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| Titel |
Interactions between marine biota and ENSO: a conceptual model analysis |
| VerfasserIn |
M. Heinemann, A. Timmermann, U. Feudel |
| 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 ; 18, no. 1 ; Nr. 18, no. 1 (2011-01-21), S.29-40 |
| Datensatznummer |
250013865
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| Publikation (Nr.) |
 copernicus.org/npg-18-29-2011.pdf |
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| Zusammenfassung |
We develop a conceptual coupled atmosphere-ocean-ecosystem model for the
tropical Pacific to investigate the interaction between marine biota and the
El Niño-Southern Oscillation (ENSO). Ocean and atmosphere are represented
by a two-box model for the equatorial Pacific cold tongue and the warm pool,
including a simplified mixed layer scheme. Marine biota are represented by a
three-component (nutrient, phytoplankton, and zooplankton) ecosystem model.
The atmosphere-ocean model exhibits an oscillatory state which qualitatively
captures the main physics of ENSO. During an ENSO cycle, the variation of
nutrient upwelling, and, to a small extent, the variation of
photosynthetically available radiation force an ecosystem oscillation. The
simplified ecosystem in turn, due to the effect of phytoplankton on the
absorption of shortwave radiation in the water column, leads to (1) a warming
of the tropical Pacific, (2) a reduction of the ENSO amplitude, and
(3) a prolongation of the ENSO period. We qualitatively investigate these
bio-physical coupling mechanisms using continuation methods. It is
demonstrated that bio-physical coupling may play a considerable role in
modulating ENSO variability. |
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