Mark J Warner, University of Washington Seattle Campus, Seattle, WA, United States, Rolf E Sonnerup, University of Washington, Joint Institute for the Study of the Atmosphere and Ocean, Seattle, WA, United States, Stephen R Rintoul, Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC), Hobart, Australia and Alison M Macdonald, WHOI, Woods Hole, MA, United States