Program and Agenda

Abstract

INTERACTION BETWEEN ENSO AND THE SPCZ IN DIFFERENT CLIMATE STATES: CORAL DATA AND MODEL RESULTS

The hydrological cycle of the southwest tropical Pacific Ocean (from Papua New Guinea to Tahiti) is mainly related to the position and strength of the South Pacific Convergence Zone (SPCZ). One of the major influences on SPCZ activity is the El Niño Southern Oscillation (ENSO) phenomenon. During El Niño events, the SPCZ shifts northeastward, inducing a significant reduction of the amount of rainfall in places such as New Caledonia, Vanuatu, Fiji and Tahiti. On the opposite, La Niña events tend to shift the SPCZ southwestward, increasing precipitation in those locations. In order to understand the behaviour of both the SPCZ and ENSO in different climate backgrounds, we generated high resolution coral records from Vanuatu, on the southern edge of the SPCZ, and compared them to model outputs. Fossil corals yielded SST and precipitation records from the LGM, the Younger Dryas, 10 ka, 6.5 ka and 4.2 ka. Model results were obtained from the IPSL-CM5a climate model, and from the PMIP3 database. Both coral and model results show the complex interplay between ENSO and the SPCZ.

Authors

Corrège, T., Université Bordeaux,UMR 5805 EPOC, France, t.correge@epoc.u-bordeaux1.fr

Saint-Lu, M., CEA-CNRS-UVSQ, LSCE, France, marion.saint-lu@lsce.ipsl.fr

Braconnot, P., CEA-CNRS-UVSQ, LSCE, France, pascale.braconnot@lsce.ipsl.fr

Lazareth, C. E., IRD, LOCEAN, France, claire.lazareth@ird.fr

Le Cornec, F., IRD, LOCEAN, florence.le_cornec@ird.fr

Details

Oral presentation

Session #:007
Date: 2/25/2014
Time: 08:15
Location: 313 B

Presentation is given by student: No