1. Climate Change Research Centre, School of Biological, Earth and Environmental Sciences; University of New South Wales; Sydney NSW 2052 Australia
2. Department of the Environment; Australian Antarctic Division, Kingston; Tasmania Australia
3. Antarctic Climate & Ecosystems Cooperative Research Centre; University of Tasmania; Hobart Tasmania Australia
4. Centre for Australian Weather and Climate Research; CSIRO Marine and Atmospheric Research; Aspendale VIC Australia
5. Glaciology and Climate Change Laboratory; Centro de Estudios Científicos; Valdivia, and Departamento de Geografía, Universidad de Chile; Santiago Chile