Annual periodicity of the 18O16O and 13C12C ratios in the coral Montastrea annularis |
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Authors: | Richard G. Fairbanks Richard E. Dodge |
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Affiliation: | Lamont-Doherty Geological Observatory Palisades, NY 10964, U.S.A.;Nova University Ocean Sciences Center, 8000 North Ocean Drive, Dania, FL 33004, U.S.A. |
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Abstract: | The isotopic ratios and show an annual periodicity in the coral Montastrea annularis from Bermuda, Jamaica and Barbados. The abundances of 18O and 13C are positively correlated in the Jamaica and Barbados samples, but inversely related in the Bermuda sample. Annual high density growth bands are formed during the season of warmest water temperature at all 3 sites and are enriched in 16O. M. Annularis has a constant displacement from oxygen isotopic equilibrium and accurately records seasonal temperature variations via the temperature-dependent aragonite-water fractionation factor. Light intensity, through the activity of the coral's endosymbiotic algae, regulates the depth-dependent and seasonal variations in the skeletal carbon isotopic composition. |
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