HR: 17:00h
AN: OS54A-05    [Abstracts]
TI: Biogeochimical modelling study of Tropical Instability Waves in Pacific ocean.
AU: * Gorgues, T
EM: tglod@lodyc.jussieu.fr
AF: Laboratoire d'Oc‚anographie Dynamique et de Climatologie, UPMC Tour 45-55 - 4eme etage Boite 100 4, place Jussieu 75252 PARIS Cedex 05, PARIS, 75252 France
AU: Menkes, C
EM: menkes@lodyc.jussieu.fr
AF: Scripps Institution of Oceanography, Scripps Institution of Oceanography, UCSD 9500 Gilman Drive La Jolla CA 92093-0227, La Jolla, CA 0227 United States
AU: Aumont, O
AF: Laboratoire d'Oc‚anographie Dynamique et de Climatologie, UPMC Tour 45-55 - 4eme etage Boite 100 4, place Jussieu 75252 PARIS Cedex 05, PARIS, 75252 France
AU: Dandonneau, Y
EM: Yves.Dandonneau@lodyc.jussieu.fr
AF: Laboratoire d'Oc‚anographie Dynamique et de Climatologie, UPMC Tour 45-55 - 4eme etage Boite 100 4, place Jussieu 75252 PARIS Cedex 05, PARIS, 75252 France
AU: Vialard, J
EM: Jerome.Vialard@lodyc.jussieu.fr
AF: Laboratoire d'Oc‚anographie Dynamique et de Climatologie, UPMC Tour 45-55 - 4eme etage Boite 100 4, place Jussieu 75252 PARIS Cedex 05, PARIS, 75252 France
AU: Landry, M
EM: mlandry@ucsd.edu
AF: Scripps Institution of Oceanography, Scripps Institution of Oceanography, UCSD 9500 Gilman Drive La Jolla CA 92093-0227, La Jolla, CA 0227 United States
AB: Tropical Instability Waves (TIW) are prominent features of the equatorial Atlantic and Pacific Oceans. They have been suggested to induce profound modifications of the marine ecosystem with implications for production and carbon fluxes. Here, we use a coupled dynamical-biogeochemical model of the tropical Pacific to document and understand how TIWs affect the ecosystem over the 1992-2000 time period. The model is forced with scatterometer winds and produces realistic TIW variability. The Ecosystem model includes, PO4, NO3, SI and Iron colimitations, 2 classes of phyto and zooplankton and micronekton. The patterns of nutrients, phyto, zooplankton, and micronekton resembles those observed during PICOLO. First, we dicuss the mecanisms at work to produce such patterns and their implication on the production and carbon fluxes at these scales. Second, we force the ecosystem model off line without the TIW dynamical variability to infer the seasonal ecosystem budgets induced by the TIW over the 1992-2000 period.
DE: 4806 Carbon cycling
DE: 4815 Ecosystems, structure and dynamics
DE: 4231 Equatorial oceanography
DE: 4255 Numerical modeling
DE: 4522 El Ni¤o
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting