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Conclusions

We may conclude from our first-ever three-dimensional assessment detects the effect of the MPA on atmospheric ozone but shows that CFCs do not play a major role in the observed recent variations of total ozone. For the Northern Hemisphere the effect of active chlorine depends on the meteorological situation and is more noticeable for a colder stratospheric winter. For the Southern Hemisphere the effect mainly depends on the amount of chlorine loading. Using 3D UIUC SCTM with UKMO circulation and temperature fields we are able to estimate the benefits from the Montreal Protocol and its Amendments for specific countries. It should be also emphasized that the uncertainty of our results depends on an ambiguity of the scenario of CFCs concentration grows. Nevertheless, such model estimations devoted to the assessment of the Montreal Protocol and further agreements efficiency are very useful and should be continued in the future to elucidate the practical benefits for different countries from the Montreal Protocol and to perceive gaps in our knowledge about the recent total ozone trends.