Affiliation: | aDepartment of Geography, Durham University, Science Site, South Road, Durham, DH1 3LE, UK;bDepartment of Earth Sciences, Durham University, Science Site, South Road, Durham, DH1 3LE, UK;cDepartment of Geography, University of Dundee, Perth Road, Dundee, DD1 4HN, UK;dDepartement Geografie, Vrije Universiteit Brussel, B-1050 Brussel, Belgium |