Benjamin Cook, NASA-GISS, New York, NY, United States, Park Williams, Lamont -Doherty Earth Observatory, Palisades, NY, United States, David W Stahle, University of Arkansas, Fayetteville, AR, United States, Edward R Cook, Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States and Dorian J Burnette, University of Memphis, Memphis, TN, United States