1. Institute for Marine and Antarctic Studies University of Tasmania Hobart Tasmania 7001 Australia
2. Antarctic Climate & Ecosystem Cooperative Research Centre University of Tasmania Hobart Tasmania 7001 Australia
3. Sydney Institute of Marine Science 19 Chowder Bay Road Mosman New South Wales 2088 Australia
4. Department of Zoology and Entomology Mammal Research Institute University of Pretoria Private Bag X20 Hatfield 0028 South Africa
5. Sea Mammal Research Unit Scottish Oceans Institute University of St Andrews St Andrews UK
6. Department of Ecology and Evolutionary Biology University of California Santa Cruz California USA
7. Centre d'Etudes Biologiques de Chizé Centre National de la Recherche Scientifique Villiers en Bois France
8. Centre for Ice and Climate Niels Bohr Institute University of Copenhagen Copenhagen Denmark
9. Department of Biological Sciences Macquarie University Sydney New South Wales 2109 Australia
10. Norwegian Polar Institute Fram Centre Tromsø N‐9296 Norway
11. Instituto de Oceanografia Universidade Federal do Rio Grande Porto Alegre Brazil
12. CSIRO Wealth from Oceans Research Flagship and Marine & Atmospheric Research GPO Box 1538 Hobart Tasmania 7001 Australia
13. Department of Meteorology Stockholm University Stockholm Sweden
14. Laboratoire d'Océanographie et du Climat: Expérimentation et Approches Numériques Paris France