1. Institute at Brown for Environmental and Society Brown University, Providence, RI, USA
2. National Center for Atmospheric Science Reading UK
3. Centre for Polar Observation and Modelling University of Reading Reading UK
4. Department of Earth Sciences University of Oxford Oxford UK
5. Bullard Laboratories, Department of Earth Sciences University of Cambridge Cambridge UK
6. School of Mathematics and Statistics University of St Andrews Saint Andrews UK
7. Department of Atmospheric Sciences University of Washington Seattle WA USA
8. Department of Mathematics University of Utah Salt Lake City UT USA