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Detailed Reference Information |
Ourbak, T., Corrège, T., Malaizé, B., Le Cornec, F., Charlier, K. and Peypouquet, J.P. (2006). A high-resolution investigation of temperature, salinity, and upwelling activity proxies in corals. Geochemistry Geophysics Geosystems 7: doi: 10.1029/2005GC001064. issn: 1525-2027. |
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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 (δ18O), 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 δ18O 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. |
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Abstract |
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Keywords
Paleoceanography, Corals, Paleoceanography, Geochemical tracers, Paleoceanography, Sea surface temperature |
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Journal
Geochemistry Geophysics Geosystems |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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