1. Division of Earth and Ocean Sciences, Nicholas School for the Environment and Earth Sciences, Duke University, Durham, North Carolina
2. NOAA/National Climatic Data Center, Asheville, North Carolina
3. Climate Dynamics Group, Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford, United Kingdom
4. Antarctic Climate and Ecosystems Cooperative Research Centre, and CSIRO Marine Research, University of Tasmania, Hobart, Tasmania, Australia
5. Climatic Research Unit, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
6. School of Meteorology, University of Oklahoma, Norman, Oklahoma
7. Climate Monitoring and Data Interpretation Division, Meteorological Service of Canada, Downsview, Ontario, Canada
8. Canadian Centre for Climate Modelling and Analysis, Meteorological Service of Canada, Victoria, British Columbia, Canada