Jacob Opher^1,2, J. Alexander Brearley¹, Stephen Dye³, Ian Renfrew⁴, Robert S Pickart⁵, Michael Paul Meredith¹ and Benjamin Harden⁶, (1)NERC British Antarctic Survey, Cambridge, United Kingdom, (2)University of East Anglia, Norwich, United Kingdom, (3)University of East Anglia, Centre for Ocean and Atmospheric Sciences, Norwich, United Kingdom, (4)University of East Anglia, School of Environmental Sciences, Norwich, United Kingdom, (5)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (6)Woods Hole Oceanographic Inst, Woods Hole, MA, United States