Publication Date:
2022-05-25
Description:
© The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 10 (2013): 4591-4606, doi:10.5194/bg-10-4591-2013.
Description:
The shells of marine mollusks are widely used archives of past climate and ocean chemistry. Whilst the measurement of mollusk δ18O to develop records of past climate change is a commonly used approach, it has proven challenging to develop reliable independent paleothermometers that can be used to deconvolve the contributions of temperature and fluid composition on molluscan oxygen isotope compositions. Here we investigate the temperature dependence of 13C–18O bond abundance, denoted by the measured parameter Δ47, in shell carbonates of bivalve mollusks and assess its potential to be a useful paleothermometer. We report measurements on cultured specimens spanning a range in water temperatures of 5 to 25 °C, and field collected specimens spanning a range of −1 to 29 °C. In addition we investigate the potential influence of carbonate saturation state on bivalve stable isotope compositions by making measurements on both calcitic and aragonitic specimens that have been cultured in seawater that is either supersaturated or undersaturated with respect to aragonite. We find a robust relationship between Δ47 and growth temperature. We also find that the slope of a linear regression through all the Δ47 data for bivalves plotted against seawater temperature is significantly shallower than previously published inorganic and biogenic carbonate calibration studies produced in our laboratory and go on to discuss the possible sources of this difference. We find that changing seawater saturation state does not have significant effect on the Δ47 of bivalve shell carbonate in two taxa that we examined, and we do not observe significant differences between Δ47-temperature relationships between calcitic and aragonitic taxa.
Description:
This work was funded by National Science
Foundation grants ARC-1215551 to R. A. Eagle and A. K. Tripati,
EAR-1024929 to R. A. Eagle and J. M. Eiler, and EAR-0949191 to
A. K. Tripati. A. K. Tripati is also supported by the Hellman Fellowship
program. Culture of bivalves in Kiel, Germany, was funded by the German
Science Foundation (DFG Ei272/21-1, to Anton Eisenhauer) and
the European Science Foundation (ESF) Collaborative Research
Project CASIOPEIA (04 ECLIM FP08). Determination of bivalve
mineralogy by J. B. Ries was funded by National Science
Foundation grant OCE-1031995.
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
Permalink
