Emma Renee Robertson^1,2, Alexander Haumann^1,2, Krissy Anne Reeve¹ and Michael Paul Meredith³, (1)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, Bremerhaven, Germany, (2)Ludwig-Maximilians-Universität München, Munich, Germany, (3)NERC British Antarctic Survey, Cambridge, United Kingdom