Clare Watt¹, Hayley Jane Allison², Rhys L Thompson³, Nigel Peter Meredith⁴, Sarah Bentley¹, Jonathan Rae⁵, Sarah A Glauert⁴ and Richard Bertram Horne⁴, (1)University of Reading, Reading, RG6, United Kingdom, (2)NERC British Antarctic Survey, Cambridge, United Kingdom, (3)University of Reading, Mathematics, Reading, United Kingdom, (4)British Antarctic Survey, Cambridge, United Kingdom, (5)University College London, Mullard Space Science Laboratory, London, United Kingdom