Affiliation: | a Dept of Earth Sciences, Science Laboratories, University of Durham, South Road, Durham, DH1 3LE, UK b Dept of Geography, Science Laboratories, University of Durham, South Road, Durham, DH1 3LE, UK c Environmental Change Network, Centre for Ecology & Hydrology, University of Lancaster, Bailrigg, Lancaster, Cumbria, LA1 4YO, UK |