In:
Geochemistry, Geophysics, Geosystems, American Geophysical Union (AGU), Vol. 7, No. 3 ( 2006-03)
Abstract:
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 (δ 18 O), were investigated at near‐fortnightly resolution. Geochemical measurements were compared to sea surface temperature (SST TSG ) and salinity (SSS TSG ) recorded by a thermosalinograph (TSG) located less than 10 m from the coral. Results show that Sr/Ca, Mg/Ca, and δ 18 O are temperature‐dependent (correlation coefficient to local SST TSG 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 SST TSG and SSS TSG , 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.
Type of Medium:
Online Resource
ISSN:
1525-2027
,
1525-2027
DOI:
10.1029/2005GC001064
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2006
detail.hit.zdb_id:
2027201-7
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