Jason E Smerdon¹, Seung Hun Baek², George-Costin Dobrin³, Jacob Naimark³, Edward R Cook⁴, Benjamin Cook⁵, Richard Seager⁶ and Mark A Cane⁷, (1)Lamont-Doherty Earth Observatory, Palisades, NY, United States, (2)Columbia University, Department of Earth and Environmental Sciences, New York, NY, United States, (3)Columbia University, New York, United States, (4)Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, (5)NASA-GISS, New York, NY, United States, (6)Lamont Doherty Earth Obs, Palisades, NY, United States, (7)Lamont-Doherty Earth Obs, Palisades, NY, United States