1. Institute for Arctic and Alpine ResearchUniversity of Colorado Boulder Boulder CO USA
2. Department of Atmospheric and Oceanic SciencesUniversity of Colorado Boulder Boulder CO USA
3. Division of Earth and Ocean SciencesDuke University Durham NC USA
4. Scripps Institution of Oceanography La Jolla CA USA
5. Climate Science CentreCSIRO Oceans and Atmosphere Aspendale Victoria Australia
6. NORCE Norwegian Research CentreBjerknes Centre for Climate Research Bergen Norway