1. College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331–5503, USA.
2. Woodrow Wilson School of Public and International Affairs, Princeton University, NJ 08544, USA.
3. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA.
4. Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14850, USA.
5. Department of Geosciences, Oregon State University, Corvallis, OR 97331, USA.
6. Department of Geography, University of Oregon, Eugene, OR 97403, USA.
7. Institució Catalana de Recerca i Estudis Avançats and Institute of Environmental Science and Technology, Autonomous University of Barcelona, Bellaterra, Spain.