ADGEO Advances in Geosciences ADGEO Adv. Geosci. 1680-7359 Copernicus Publications Göttingen, Germany 10.5194/adgeo-6-23-2006 ENSO and interdecadal climate variability over the last century documented by geochemical records of two coral cores from the South West Pacific Ourbak T. 2 1 Corrège T. 2 Malaizé B. 1 Le Cornec F. 2 Charlier K. 1 Peypouquet J. P. 1 Département de Géologie et Océanographie (DGO), UMR CNRS 5805 EPOC, Université Bordeaux 1, Avenue des facultés, 33405 Talence cedex, France Institut de Recherche pour le Développement (IRD) UR055 Paleotropique 32, avenue Henri Varagnat 93143 Bondy cedex, France 09 01 2006 6 23 27 Copyright: © 2006 T. Ourbak et al. 2006 This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic License. To view a copy of this licence, visit https://creativecommons.org/licenses/by-nc-sa/2.5/ This article is available from https://adgeo.copernicus.org/articles/6/23/2006/adgeo-6-23-2006.html The full text article is available as a PDF file from https://adgeo.copernicus.org/articles/6/23/2006/adgeo-6-23-2006.pdf

The south west Pacific is affected by climatic phenomena such as ENSO (El Ni&#241;o Southern Oscillation) or the PDO (Pacific Decadal Oscillation). Near-monthly resolution calibrations of Sr/Ca, U/Ca and <span style="font-family: 'Symbol, Times New Roman, Times'; font-size: 16px;">&delta;</span><sup>18</sup>Oc 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.