Reproducibility of Geochemical and Climatic Signals in the Atlantic Coral Montastraea Faveolata

Authors

Jennifer M. Smith, University of South Florida
Terrence M. Quinn, University of South FloridaFollow
Kevin P. Helmle, National Coral Reef Institute
Robert B. Halley, U.S. Geological Survey

Document Type

Article

Publication Date

3-8-2006

Keywords

Montastraea, geochemistry, replication

Digital Object Identifier (DOI)

https://doi.org/10.1029/2005PA001187

Abstract

Monthly resolved, 41‐year‐long stable isotopic and elemental ratio time series were generated from two separate heads of Montastraea faveolata from Looe Key, Florida, to assess the fidelity of using geochemical variations in Montastraea, the dominant reef‐building coral of the Atlantic, to reconstruct sea surface environmental conditions at this site. The stable isotope time series of the two corals replicate well; mean values of δ¹⁸O and δ¹³C are indistinguishable between cores (compare 0.70‰ versus 0.68‰ for δ¹³C and −3.90‰ versus −3.94‰ for δ¹⁸O). Mean values from the Sr/Ca time series differ by 0.037 mmol/mol, which is outside of analytical error and indicates that nonenvironmental factors are influencing the coral Sr/Ca records at Looe Key. We have generated significant δ¹⁸O–sea surface temperature (SST) (R = −0.84) and Sr/Ca‐SST (R = −0.86) calibration equations at Looe Key; however, these equations are different from previously published equations for Montastraea. Variations in growth parameters or kinetic effects are not sufficient to explain either the observed differences in the mean offset between Sr/Ca time series or the disagreement between previous calibrations and our calculated δ¹⁸O‐SST and Sr/Ca‐SST relationships. Calibration differences are most likely due to variations in seawater chemistry in the continentally influenced waters at Looe Key. Additional geochemical replication studies of Montastraea are needed and should include multiple coral heads from open ocean localities complemented whenever possible by seawater chemistry determinations.

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Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Paleoceanography and Paleoclimatology, v. 21, issue 1, art. PA1010

Copyright 2006 by the American Geophysical Union.

Scholar Commons Citation

Smith, Jennifer M.; Quinn, Terrence M.; Helmle, Kevin P.; and Halley, Robert B., "Reproducibility of Geochemical and Climatic Signals in the Atlantic Coral Montastraea Faveolata" (2006). Marine Science Faculty Publications. 114.
https://digitalcommons.usf.edu/msc_facpub/114