Coralline algal Mg-O bond strength as a marine pCO2 proxy

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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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
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 (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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
636121Abrupt Ocean Acidification EventsNicholas KamenosNatural Environment Research Council (NERC)NE/H017356/1SCHOOL OF GEOGRAPHICAL & EARTH SCIENCES