Joshua Livingston Coupe, Rutgers University New Brunswick, New Brunswick, NJ, United States, Samantha Stevenson, University of California Santa Barbara, Santa Barbara, CA, United States, Nicole S Lovenduski, University of Colorado, Department of Atmospheric and Oceanic Sciences, Boulder, CO, United States, Alan Robock, Rutgers University, New Brunswick, NJ, United States, Cheryl S Harrison, University of Texas Rio Grande Valley, School of Earth, Environmental and Marine Science, Edinburg, TX, United States, Charles Bardeen, National Center for Atmospheric Research, Boulder, CO, United States and Brian Toon, University of Colorado at Boulder, ATOC/LASP, Boulder, CO, United States