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Reconstruction of seasonal temperature variability in the tropical Pacific Ocean from the shell of the scallop, Comptopallium radula |
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| Authors: | Julien Thébault Laurent Chauvaud Jennifer Guarini Renaud Fichez Eric Morize |
| Institution: | a IRD, Unité de Recherche Camélia, BP A5, 98848 Nouméa Cedex, New Caledonia b IUEM-UBO, UMR CNRS 6539, Place Nicolas Copernic, 29280 Plouzané, France c Observatoire Océanologique de Banyuls, Université Pierre et Marie Curie, UMR CNRS 7621, 66650 Banyuls-sur-Mer, France d Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA e Centre d’Océanologie de Marseille, Station Marine d’Endoume, Rue de la Batterie des Lions, 13007 Marseille, France f Centre IRD de Bretagne, US Chronos, BP 70, 29280 Plouzané, France |
| Abstract: | We investigated the oxygen isotope composition (δ18O) of shell striae from juvenile Comptopallium radula (Mollusca; Pectinidae) specimens collected live in New Caledonia. Bottom-water temperature and salinity were monitored in-situ throughout the study period. External shell striae form with a 2-day periodicity in this scallop, making it possible to estimate the date of precipitation for each calcite sample collected along a growth transect. The oxygen isotope composition of shell calcite (δ18Oshell calcite) measured at almost weekly resolution on calcite accreted between August 2002 and July 2003 accurately tracks bottom-water temperatures. A new empirical paleotemperature equation for this scallop species relates temperature and δ18Oshell calcite: t(°C)=20.00(±0.61)-3.66(±0.39)×(δ18Oshell calcite VPDB-δ18Owater VSMOW) |
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