HR: 09:00h
AN: PP31F-05    [Abstracts]
TI: The FORCLIM Eco-Physiological Growth Model for Planktic Foraminifera: a new Tool to Reconstruct Ecological Niches, Abundance and Potential Depth and Season of Growth for Fossil Foraminifera Species in Ocean Sediment Records
AU: Lombard, F
EM: lombard@lsce.cnrs-gif.fr
AF: LSCE/IPSL, Laboratoire CEA-CNRS-UVSQ, Bat. 12, Avenue de la Terrasse, Gif-sur-Yvette, F-91198, France
AU: * Labeyrie, L
EM: Laurent.Labeyrie@lsce.ipsl.fr
AF: LSCE/IPSL, Laboratoire CEA-CNRS-UVSQ, Bat. 12, Avenue de la Terrasse, Gif-sur-Yvette, F-91198, France
AU: * Labeyrie, L
EM: Laurent.Labeyrie@lsce.ipsl.fr
AF: IUF Departement de Physique UVSQ, Bat. Buffon 202 45 avenue des Etats Unis, Versailles, F-78035, France
AU: Michel, E
EM: Elisabeth.michel@lsce.cnrs-gif.fr
AF: LSCE/IPSL, Laboratoire CEA-CNRS-UVSQ, Bat. 12, Avenue de la Terrasse, Gif-sur-Yvette, F-91198, France
AU: Lea, D
EM: lea@geol.ucsb.edu
AF: Dept. of Earth Science, University of California, Santa Barbara, CA 93106-9630, United States
AU: Spero, H J
EM: spero@geology.ucdavis.edu
AF: Department of Geology, University of California Davis, Davis, CA 95616, United States
AU: Forclim, M o
EM: labeyrie@lsce.ipsl.fr
AF: LSCE/IPSL, Laboratoire CEA-CNRS-UVSQ, Bat. 12, Avenue de la Terrasse, Gif-sur-Yvette, F-91198, France
AU: Forclim, M o
EM: labeyrie@lsce.ipsl.fr
AF: BIAF Universite d'Angers, Faculte des Sciences 2 Boulevard Lavoisier, Angers cedex 01, F- 49045, France
AU: Forclim, M o
EM: labeyrie@lsce.ipsl.fr
AF: EPOC Universite Bordeaux 1, Avenue des Facultes Batiment B18, Talence cedex, F-33405, France
AB: Paleocean hydrological reconstructions derived from planktic foraminifera isotopic ratios (δ¹⁸O and δ¹³C) or trace element ratio (Mg/Ca) are poorly constrained, for lack of precise knowledge on seasonality and water depth of test formation. This is particularly limiting for reconstruction of the thermocline characteristics. Various calibrations have been published, based on statistical correlation with core tops fossil fauna, sediment traps or plankton net collection. We present here what we think is the first eco-physiological model reproducing the growth of different foraminifera species in function of environmental parameter. By reproducing the main physiological rates of foraminifera (nutrition, respiration, symbiotic photosynthesis), this model estimates their growth in function of temperature, light availability and food concentration. The model is now calibrated for the species Neogloboquadrina pachyderma (dextral and sinistral forms), Neogloboquadrina dutertrei, Globigerina bulloides, Globigerinoides ruber, Globigerinoides sacculifer, Globigerinella siphonifera and Orbulina universa. Most of the model parameters are derived from newly performed experimental observations or from published data and only the influence of food concentration (in a Chl a basis) was calibrated with field observations. Using satellite data, the model predict the seasonal distribution of dominant foraminifer species over 576 field observations worldwide with efficiency higher than 60%. Moreover, the growth rate estimated for each foraminifera species can be used as an abundance indicator which allows prediction of the season and water depth at which most of the population has developed. This offers larges perspectives for both actual understanding of foraminifera role in the carbon/carbonate ocean cycle and for better quantification of paleoceanographic proxies. Forclim is a program supported by the Agence Nationale pour la Recherche and Institut National des Sciences de l'Univers, France.
DE: 4900 PALEOCEANOGRAPHY (0473, 3344)
DE: 4944 Micropaleontology (0459, 3030)
DE: 4994 Instruments and techniques
DE: 4999 General or miscellaneous
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting