Pauly, M., Kamenos, N. A. , Donohue, P. and LeDrew, E. (2015) Coralline algal Mg-O bond strength as a marine pCO2 proxy. Geology, 43(3), pp. 267-270. (doi: 10.1130/G36386.1)
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Abstract
Past ocean acidification recorded in the geological record facilitates the understanding of rates and influences of contemporary <i>p</i>CO<sub>2</sub> enrichment. Most pH reconstructions are made using boron, however there is some uncertainty associated with vital effects and isotopic fractionation. Here we present a new structural proxy for carbonate chemistry; Mg-O bond strength in coralline algae. Coralline algae were incubated in control (380 μatm <i>p</i>CO<sub>2</sub>), moderate (750 μatm<i>p</i>CO<sub>2</sub>), and high (1000 μatm <i>p</i>CO<sub>2</sub>) acidification conditions for 24 months. Raman spectroscopy was used to determine skeletal Mg-O bond strength. There was a positive linear relationship between <i>p</i>CO<sub>2</sub> concentration and bond strength mediated by positional disorder in the calcite lattice when accounting for seasonal temperature. The structural preservation of the carbonate chemistry system in coralline algal high-Mg calcite represents an alternative approach to reconstructing marine carbonate chemistry. Significantly, it also provides an important mechanism for reconstructing historic atmospheric CO<sub>2</sub> concentrations.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Kamenos, Professor Nick and Donohue, Miss Penelope |
Authors: | Pauly, M., Kamenos, N. A., Donohue, P., and LeDrew, E. |
College/School: | College of Science and Engineering > School of Geographical and Earth Sciences |
Journal Name: | Geology |
Publisher: | Geological Society of America |
ISSN: | 0091-7613 |
ISSN (Online): | 1943-2682 |
Copyright Holders: | Copyright © 2015 The Authors |
First Published: | First published in Geology 43(3):267-270 |
Publisher Policy: | Reproduced under a Creative Commons License |
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