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          Institute: MPI für Meteorologie     Collection: Ocean in the Earth System     Display Documents



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ID: 498458.0, MPI für Meteorologie / Ocean in the Earth System
Interactions between marine biota and ENSO: a conceptual model analysis
Authors:Heinemann, M.; Timmermann, A.; Fendel, U.
Language:English
Date of Publication (YYYY-MM-DD):2011
Title of Journal:Nonlinear Processes in Geophysics
Volume:18
Start Page:29
End Page:40
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We develop a conceptual coupled atmosphereocean-ecosystem model for the tropical Pacific to investigate the interaction between marine biota and the El Nino-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 biophysical coupling mechanisms using continuation methods. It is demonstrated that bio- physical coupling may play a considerable role in modulating ENSO variability.
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Ocean in the Earth System
Identifiers:DOI:10.5194/npg-18-29-2011
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