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| Titel |
Evidence for the non-influence of salinity variability on the Porites coral Sr/Ca palaeothermometer |
| VerfasserIn |
M. Moreau, T. Corrège, E. P. Dassié, F. Le Cornec |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 3 ; Nr. 11, no. 3 (2015-03-24), S.523-532 |
| Datensatznummer |
250117213
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| Publikation (Nr.) |
 copernicus.org/cp-11-523-2015.pdf |
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| Zusammenfassung |
Porites coral-based sea surface temperature (SST) reconstructions are obtained from the
measurement of skeleton Sr/Ca ratio. However, the influence of salinity
in the incorporation of these trace elements in the Porites
aragonitic skeleton is still poorly documented. Laboratory experiments
indicate that in three different coral species (not including the widely used
Porites genus), salinity does not influence the Sr/Ca
thermometer. In this study, we test the salinity effect on Porites
Sr/Ca-based SST reconstructions at monthly and interannual timescales
in open-ocean environmental conditions. We use a large spatial compilation of
published Porites data from the Red Sea and Pacific and Indian oceans. Additionally to those published records, we add a new eastern
Pacific coral Sr/Ca record from Clipperton Atoll.
Using two different salinity products (Simple Ocean Data Assimilation (SODA) SSS reanalyses version
2.2.4, Carton and Giese, 2008; and instrumental SSS from the Institut de Recherche pour
le Développement, France (IRD)
Delcroix et al., 2011), we find no evidence of salinity bias on the
Sr/Ca SST proxy at monthly and interannual timescales. We conclude that
Porites Sr/Ca is a reliable palaeothermometer that is not
influenced by salinity variability. |
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