Peidong Wang, Massachusetts Institute of Technology, Cambridge, United States; Stanford University, Stanford, CA, United States, Susan Solomon, MIT/EAPS, Cambridge, MA, United States, Benjamin D Santer, LLNL, Livermore, United States, Douglas Edward Kinnison, NCAR, Boulder, United States, Qiang Fu, University of Washington, Seattle, United States, Kane Stone, Massachusetts Institute of Technology, Cambridge, MA, United States, Jun Zhang, National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, United States, Gloria L Manney, NorthWest Research Associates, Inc, Socorro, NM, United States and Luis Millan, NASA Jet Propulsion Laboratory, Pasadena, CA, United States