1. Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, USA.
2. Département de Mathématiques, Université du Québec à Montréal, Montréal, Quebec, Canada.
3. Institut de Ciència i Tecnologia Ambientals (ICTA-UAB), Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain.
4. Department of Earth and Planetary Science, McGill University, Montreal, Quebec, Canada.
5. Department of Geography, University of California, Santa Barbara, Santa Barbara, CA, USA.