Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Geochemistry Geophysics Geosystems NIL_95-NIL_107 corals geochemical tracers calibration sea surface salinity upwelling climate and interannual variability paleoceanography : corals paleoceanography : geochemical tracers paleoceanography : sea surface temperature 2006 PAR00000890 ENG Geochemistry Geophysics Geosystems 1525-2027 CC:0002367288-0003 10.1029/2005GC001064 https://www.documentation.ird.fr/hor/PAR00000890 7 Horizon (IRD) 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.