1. Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? Waugh, Darryn W.; Garfinkel, Chaim I.; Polvani, Lorenzo M. 2015 Articles Atmospheric chemistry--Environmental aspectsOcean temperatureClimatic changesStratosphereOzone layer depletionAtmospheric ozoneFluid dynamicsAtmosphereMeteorology