%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Ourbak, Timothée
%A Corrège, Thierry
%A Malaizé, B.
%A Le Cornec, Florence
%A Charlier, K.
%A Peypouquet, J. P.
%T A high-resolution investigation of temperature, salinity, and upwelling activity proxies in corals - art. no. Q03013
%D 2006
%L PAR00000890
%G ENG
%J Geochemistry Geophysics Geosystems
%@ 1525-2027
%K corals ; geochemical tracers ; calibration ; sea surface salinity ; upwelling ; climate and interannual variability ; paleoceanography : corals ; paleoceanography : geochemical tracers ; paleoceanography : sea surface temperature
%M CC:0002367288-0003
%P NIL_95-NIL_107
%R 10.1029/2005GC001064
%U https://www.documentation.ird.fr/hor/PAR00000890
%V 7
%W Horizon (IRD)
%X We present a high-resolution study of five geochemical components of a New Caledonia coral core. Minor and trace elements (Sr/Ca, U/Ca, Mg/Ca, Ba/Ca), together with oxygen isotopes (delta O-18), were investigated at near-fortnightly resolution. Geochemical measurements were compared to sea surface temperature (SSTTSG) and salinity (SSSTSG) recorded by a thermosalinograph (TSG) located less than 10 m from the coral. Results show that Sr/Ca, Mg/Ca, and delta O-18 are temperature-dependent ( correlation coefficient to local SSTTSG between 0.74 and 0.84). Their robustness as SST tracers is tested against a satellite-based data set for a 4 year validation period. U/Ca has a more complex behavior and appears to be linked to both SSTTSG and SSSTSG, despite relatively small local SSS variations. For the first time this salinity-related imprint is quantified in a U/Ca coralline ratio. In addition to SST and SSS tracers, Ba/Ca measurements provide a possible way to investigate upwelling activity occurrences.