Claire E. Huck (a), Tina van de Flierdt (a), Steven M. Bohaty (b) & Sam Hammond (c)
(a) Imperial College London, London SW7 2AZ, UK. E-mail: c.huck10@imperial.ac.uk
(b) Ocean and Earth Science, University of Southampton, Southampton SO14 3ZH, UK.
(c) The Open University, Walton Hall, Milton Keynes MK7 6AA, UK.