613 Seminar: Feng Li



Stratospheric ozone depletion plays an essential role in driving Southern Hemisphere climate change in the past 3-4 decades. The radiative and dynamical effects of the Antarctic ozone hole not only impact Southern Hemisphere stratosphere, but also influence climate change in the troposphere, surface, Southern Ocean, and Antarctic sea ice. I will discuss two topics in this talk: 1) separating the effects of stratospheric ozone depletion and greenhouse gas increase on Southern Hemisphere climate change; and 2) impacts of interactive stratospheric chemistry on simulated climate change, particularly in the Southern Ocean and Antarctic sea ice. I will present results from ensemble simulations for the 1960-2010 period using the coupled atmosphere-ocean-chemistry GEOS-5 model. The results show that stratospheric ozone depletion is the major drive of the Southern Hemisphere summer atmospheric and oceanic circulation change, and that it is important to correctly represent stratospheric ozone forcing in order to fully capture its effects on climate change.

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