Joint Seminar: Recent Findings on the Impact of Stratospheric Ozone Changes on Climate

Interactions between ozone and climate have been investigated ever
since the early 1970s when scientists first suggested that
human-produced chemicals could destroy the ozone layer in the upper
atmosphere. Stratospheric ozone depletion, especially over the poles,
not only causes stratospheric cooling but is also one of the most
important players for tropospheric Southern Hemisphere climate change
during the last 30 years. The 1987 Montreal Protocol on Substances that
Deplete the Ozone Layer provided a mechanism for reducing and
phasing-out the use of chlorofluorocarbons, halons and other man-made
ozone depleting substances (ODS). As a consequence of the successful
ratification of this international treaty, ODS are now declining and
there are suggestions that the stratospheric ozone layer is recovering
and the Antarctic ozone hole no longer growing. This talk will address
two important questions related to the Montreal Protocol.  (1) What is
the impact of a recovery of the Antarctic ozone hole during the 21st
century on Southern Hemisphere climate? (2) What likely would have
happened to the ozone layer and climate without a ban of ODS emissions?
To answer these questions, results from chemistry climate model
simulations will be presented.  In addition, the limitations of this
study and open research questions will be discussed.




13:30 Uhr


Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg


Judith Perlwitz, NOAA


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