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- Title
The influence of temperature and seawater carbonate saturation state on <sup>13</sup>C-<sup>18</sup>O bond ordering in bivalve mollusks.
- Authors
Eagle, R. A.; Eiler, J. M.; Tripati, A. K.; Ries, J. B.; Freitas, P. S.; Hiebenthal, C.; Wanamaker Jr., A. D.; Taviani, M.; Elliot, M.; Marenssi, S.; Nakamura, K.; Ramirez, P.; Roy, K.
- Abstract
The shells of marine mollusks are widely used archives of past climate and ocean chemistry. Whilst the measurement of mollusk δ18 O 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 Δ 47, in shell carbonates of bivalve mollusks and assess its potential to be a useful paleothermometer. We report measurements on cultured spec- imens 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 the Δ 47 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 Δ 47 of bivalve shell carbonate in two taxa that we examined, and we do not observe significant differences between Δ 47-temperature relationships between calcitic and aragonitic taxa.
- Subjects
OCEAN temperature; CARBONATES; CHEMICAL bonds; BIVALVES; CLIMATE change; PALEOTHERMOMETRY
- Publication
Biogeosciences Discussions, 2013, Vol 10, Issue 1, p157
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bgd-10-157-2013