Jeroen Van Hunen¹, Hongliang Wang², Charitra Jain¹, D. Graham Pearson³, Philip Heron⁴ and Jacob Barrett⁴, (1)University of Durham, Department of Earth Sciences, Durham, United Kingdom, (2)Institute of Energy Technology, Department of Environmental Analyses, Oslo, Norway, (3)University of Alberta, Earth & Atmospheric Sciences, Edmonton, AB, Canada, (4)University of Durham, Durham, United Kingdom