Environmental Monitoring and Modelling Research Group, Department of Geography, King's College London, Strand, London, WC2R 2LS United Kingdom ; Oxford Centre for Industrial and Applied Mathematics, Mathematical Institute, 24--29 St. Giles', Oxford, OX1 3LB United Kingdom
Environmental Monitoring and Modelling Research Group, Department of Geography, King's College London, Strand, London, WC2R 2LS United Kingdom
School of Geography and Environmental Science, University of Auckland, Tamaki Campus, Private Bag 92019, Auckland, 1020 New Zealand