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News & Events

ATOC Distinguished Lecture: Stratospheric ozone and Southern Hemisphere climate change

Wednesday, February 17, 2016, 10:30AM - 11:30AM

Speaker

Lorenzo Polvani

Columbia University

Location:

SEEC Auditorium

4001 Discovery Drive, Boulder, CO

Unlike well-mixed greenhouse gases, the radiative forcing of climate due to observed stratospheric ozone loss in the second half of the 20th century is very small.  In spite of this, much new evidence has emerged in the last decade showing that the formation of the ozone hole has caused profound changes in the entire Southern Hemisphere climate system, starting from the observed poleward shift of the midlatitude jet in summertime: this has been linked to changes in tropospheric and surface temperatures, clouds and cloud radiative effects, precipitation at both middle and low latitudes, as well as temperature and circulation changes in the ocean, and possibly the cryosphere.  Similarly, the projected closing of the ozone hole with feature prominently in future climate change, with its impacts expected to largely cancel many of those from increasing greenhouse gases over the next half century.

Audience

Free and open to the public.