A potential proxy for carbonate ion concentration: progress and complexities

Lorna Kearns1, Tracy Aze2, James William Buchanan Rae3 and Robert Newton1, (1)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (2)University of Plymouth, School of Biological and Marine Sciences, Plymouth, United Kingdom, (3)University of St Andrews, School of Earth and Environmental Sciences, St Andrews, United Kingdom