Chijun Sun, University of California Davis, Department of Earth and Planetary Sciences, Davis, United States, David Fastovich, Syracuse University, Department of Earth and Environmental Sciences, Syracuse, United States; University of Georgia, Geography, Athens, GA, United States, Timothy M Shanahan, The University of Texas at Austin, Department of Earth and Planetary Sciences, Jackson School of Geosciences, Austin, United States, Tripti Bhattacharya, Syracuse University, Department of Earth and Environmental Science, Syracuse, NY, United States, Stephen Jackson, University of Wyoming, Department of Botany, Laramie, United States, James M Russell, Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, United States and John W Williams, University of Wisconsin-Madison, Department of Geography & Center for Climatic Research, Madison, United States