Charles Bardeen¹, Owen B Toon², Douglas Edward Kinnison³, Pengfei Yu⁴, Francis Vitt¹ and Alan Robock⁵, (1)National Center for Atmospheric Research, Boulder, CO, United States, (2)Univ Colorado Boulder, Boulder, CO, United States, (3)NCAR, Boulder, CO, United States, (4)CIRES, Boulder, CO, United States, (5)Rutgers University, New Brunswick, NJ, United States