Helene Aflenzer, Antarctic Climate & Ecosystems Cooperative Research Centre (ACE CRC), University of Tasmania, Hobart Tasmania 7001, TAS, Australia; Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Hobart, TAS, Australia, Philip W. Boyd, Antarctic Climate & Ecosystems Collaborative Research Centre (ACE CRC), Univesity of Tasmania, Hobart, TAS, Australia, Pier van der Merwe, Antarctic Gateway Partnership, Institute for Marine and Antarctic Studies, Hobart, TAS, Australia, Kathrin Wuttig, Antarctic Climate & Ecosystems Cooperative Research Centre (ACE CRC), University of Tasmania, Hobart, TAS, Australia and Andrew R Bowie, Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC), University of Tasmania, Hobart, TAS, Australia; Institute for Marine and Antarctic studies (IMAS), University of Tasmania, Hobart, TAS, Australia