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Campbell, R. ., ACRI ST/Laboratoire d’Océanographie Physique et Biogéochimique, Sophia Antipolis/Marseille, France, rose.campbell@etumel.univmed.fr
Diaz, F. ., Laboratoire d’Océanographie Physique et Biogéochimique, Marseille, France, frederic.diaz@univmed.fr
Ulses, C. ., Pole d'Océanographie Côtière, Laboratoire d'Aérologie, Toulouse, France, caroline.ulses@aero.obs-mip.fr
Hu, Z. ., Laboratoire d’Océanographie Physique et Biogéochimique, Marseille, France, ziyuan.hu@univmed.fr
Estournel, C. ., Pole d'Océanographie Côtière, Laboratoire d'Aérologie, Toulouse, France, claude.estournel@aero.obs-mip.fr
Petrenko, A. ., Laboratoire d’Océanographie Physique et Biogéochimique, Marseille, France, anne.petrenko@univmed.fr
Doglioli, A. ., Laboratoire d’Océanographie Physique et Biogéochimique, Marseille, France, andrea.doglioli@com.univmed.fr
Dekeyser, I. ., Centre d’Océanologie de Marseille, Marseille, France, ivan.dekeyser@univmed.fr

IMPACT OF A MESOSCALE EDDY ON THE STRUCTURE OF THE TROPHIC FOODWEB IN THE GULF OF LIONS (NW MEDITERRANEAN)

The purpose of this study, carried out in the context of the LATEX programme, is to examine the biogeochemical properties of mesoscale eddies in the Gulf of Lions (NW Mediterranean) and study their impact on the structure of the plankton community. These structures were previously identified using wavelet analysis on the outputs of a 3-dimensional hydrodynamic model, Symphonie. By adding to Symphonie a multi-nutrient, multi-functional groups of plankton, biogeochemical model, ECO3-NWMED, we analyse the biogeochemical activity within these eddies. The ouputs of the coupled model are compared to several different types of datasets (SeaWiFS images, in situ data) in order to fully verify its realism. A study of an anti-cyclonic eddy indicates a downwelling phenomenon which can be observed using various biogeochemical tracers such as nutrients, phytoplankton and bacteria. Decreasing concentrations of phytoplankton biomass throughout the period of the anticyclone are predicted and can be explained by predation by zooplankton and reduced availability of phosphate. At the end of the eddy episode, we observe various biogeochemical tracers rising up to the thermocline on the edge of the eddy.

Poster presentation

Session #:069
Date: 01-28-09
Time: 18:00 - 20:00

Presentation is given by student: No