Affiliation: | aDepartment of Geography, Royal Holloway, University of London, Egham TW20 0EX, UK;bEarth and Biosphere Institute, School of Geography, University of Leeds, Leeds LS2 9JT, UK;cGodwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing St., Cambridge, CB2 3EQ, UK |