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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Abstract

Past ocean acidification recorded in the geological record facilitates the understanding of rates and influences of contemporary pCO2 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 pCO2), moderate (750 μatmpCO2), and high (1000 μatm pCO2) acidification conditions for 24 months. Raman spectroscopy was used to determine skeletal Mg-O bond strength. There was a positive linear relationship between pCO2 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 CO2 concentrations.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kamenos, Dr Nicholas 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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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