One of the major findings in the 1992 IPCC report and the 1994 World
Meteorological Organization's Ozone Assessment report was the
identification of possible climatic effects over the last few decades
resulting from anthropogenic ally-induced changes in atmospheric ozone.
The initial quantitative estimates of their direct climatic effects
indicate significant impacts, though large uncertainties exist and
studies using general circulation models are needed. A point that needs
to be addressed in particular is that atmospheric ozone differs from
greenhouse gases in that it is formed and destroyed by chemical
processes in the atmosphere due to interaction involving a large number
of source gases (e. g. H0, NO ' CO, 2 x NMHC, N0, CH and the CFCs).
Therefore, the indirect effect of climate-chemistry 2 4 interaction
involving atmospheric ozone is an important aspect for consideration in
general circulation models. During the last few years, there have been
several international workshops related to atmospheric ozone. In 1987, a
NATO workshop on atmospheric ozone was held in Lillehammer, Norway. More
recently, two workshops were organized to discuss the topic "General
Circulation Model Study of Climate-Chemistry Interaction. " The first
was held August 19-21, 1992, in Oslo, Norway, and the second held May
26-27,1993, in Albany, New York, USA. The two workshops were IAMAP
activities under the Trace Constituent Working Group.