Feng Zhu, University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States, Julien Emile-Geay, Univ. of Southern California, Department of Earth Sciences, Los Angeles, CA, United States, Gregory J. Hakim, University of Washington, Department of Atmospheric Sciences, Seattle, WA, United States, Kevin J Anchukaitis, University of Arizona, Tucson, AZ, United States and Jonathan King, University of Arizona, Department of Geosciences, Tucson, AZ, United States