Articles | Volume 6
Adv. Geosci., 6, 23–27, 2006
https://doi.org/10.5194/adgeo-6-23-2006
Adv. Geosci., 6, 23–27, 2006
https://doi.org/10.5194/adgeo-6-23-2006

  09 Jan 2006

09 Jan 2006

ENSO and interdecadal climate variability over the last century documented by geochemical records of two coral cores from the South West Pacific

T. Ourbak2,1, T. Corrège2, B. Malaizé1, F. Le Cornec2, K. Charlier1, and J. P. Peypouquet1 T. Ourbak et al.
  • 1Département de Géologie et Océanographie (DGO), UMR CNRS 5805 EPOC, Université Bordeaux 1, Avenue des facultés, 33405 Talence cedex, France
  • 2Institut de Recherche pour le Développement (IRD) UR055 Paleotropique 32, avenue Henri Varagnat 93143 Bondy cedex, France

Abstract. The south west Pacific is affected by climatic phenomena such as ENSO (El Niño Southern Oscillation) or the PDO (Pacific Decadal Oscillation). Near-monthly resolution calibrations of Sr/Ca, U/Ca and δ18Oc were made on corals taken from New Caledonia and Wallis Island. These geochemical variations could be linked to SST (sea surface temperature) and SSS (sea surface salinity) variations over the last two decades, itselves dependent on ENSO occurrences. On the other hand, near-half-yearly resolution over the last century smoothes seasonal and interannual climate signals, but emphasizes low frequency climate variability.