Katharine R Hendry, British Antarctic Survey, Cambridge, United Kingdom, Meredith Meyer, University of East Anglia, Centre for Ocean and Atmospheric Science; School of Environmental Science, Norwich, United Kingdom, J. Alexander Brearley, NERC British Antarctic Survey, Cambridge, United Kingdom, Laura Cimoli, University of Oxford, Oxford, United Kingdom, Karen J. Heywood, University of East Anglia, Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, Norwich, United Kingdom and Joshua Lanham, University of Cambridge, Earth Sciences, Cambridge, United Kingdom