Lamont-Doherty Earth Observatory
SOUTHERN HEMISPHERE CLIMATE RESPONSE TO STRATOSPHERIC OZONE DEPLETION
The climate system in the Southern Hemisphere (SH) has seen dramatic changes in recent decades. Many of these changes are now understood to have occurred largely as a result of stratospheric ozone depletion caused by human activity. In this talk, I will review what is currently known about the SH climate response to ozone depletion. Certain aspects of the climate response, such as a poleward shift in the tropospheric circulation, have been observed. In other cases, however, the expected response to ozone depletion (e.g., of the ocean circulation and sea ice) based on models and theory is not evident in the observations, at least conclusively. Possible reasons for this are presented. Finally, I will discuss the competing roles of stratospheric ozone recovery and increasing greenhouse gases in the SH climate system during the coming decades.