Daniel A Bishop, Columbia University of New York, Earth and Environmental Sciences, New York, NY, United States, A. Park Williams, Lamont -Doherty Earth Observatory, Palisades, NY, United States, Ron L Miller, NASA/GISS, New York, NY, United States, Benjamin I Cook, National Aeronautics and Space Administration Goddard Institute for Space Studies, New York, United States and Richard Seager, Lamont Doherty Earth Obs, Palisades, NY, United States