1. Climate & Global Dynamics Laboratory National Center for Atmospheric Research Boulder CO USA
2. Department of Earth System Science University of California Irvine CA USA
3. Department of Environmental Sciences University of Virginia Charlottesville VA USA
4. Now at Geophysical Fluid Dynamics Laboratory National Oceanic and Atmospheric Administration Princeton NJ USA
5. College of Engineering and Physical Sciences University of New Hampshire Durham NH USA
6. Environmental Studies Program University of Colorado Boulder CO USA