Parsing the contributions of ocean forcings and atmospheric variability to spatially widespread droughts in the contiguous United States

Jason E Smerdon, Lamont-Doherty Earth Observatory, Palisades, United States, Seung H. H. Baek, Lamont -Doherty Earth Observatory, Palisades, NY, United States, Richard Seager, Columbia University, Lamont-Doherty Earth Observatory, Palisades, NY, United States and Benjamin I Cook, Lamont-Doherty Earth Observatory, Palisades, NY, United States