HR: 17:15h
AN: OS54A-06    [Abstracts]
TI: Biogeochimical modelling study of 1997-1999 ENSO.
AU: Menkes, C
EM: Christophe.Menkes@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: * 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: Aumont, O
EM: Olivier.Aumont@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: 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
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
AB: The 1997-1999 ENSO was among the largest ENSO on records. It had a dramatic impact of the marine ecosystem in the equatorial Pacific and produced striking features such as large unexpected phytoplankton blooms in the central Pacific when El Nino switched to La Nino in May 1998. Here, we use a coupled dynamical-biogeochemical model of the tropical Pacific to document and understand how the tropical Pacific variability during that ENSO is modified. The model is forced with scatterometer winds over 1992-2000 and produces realistic dynamical and biogeochemical features. We document the biogeochemical onset, development and demise of the El Nino and the return of La Nina with a particular focus on the contrast between the warm pool oligotrophic waters and the upwelling waters, the influence of Kelvin waves onto the ecosystem during that event and the spectacular bloom associated with La Nina's return.
DE: 4815 Ecosystems, structure and dynamics
DE: 4231 Equatorial oceanography
DE: 4522 El Ni¤o
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting