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| Titel |
Evidence for the effectiveness of the Montreal Protocol to protect the ozone layer |
| VerfasserIn |
J. A. Mäder, J. Staehelin, T. Peter, D. Brunner, H. E. Rieder, W. A. Stahel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 24 ; Nr. 10, no. 24 (2010-12-22), S.12161-12171 |
| Datensatznummer |
250008973
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| Publikation (Nr.) |
 copernicus.org/acp-10-12161-2010.pdf |
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| Zusammenfassung |
| The release of man-made ozone depleting substances (ODS, including chlorofluorocarbons and halons) into the atmosphere has led to a
near-linear increase in stratospheric halogen loading since the early 1970s,
which levelled off after the mid-1990s and then started to decline, in
response to the ban of many ODS by the Montreal Protocol (1987). We
developed a multiple linear regression model to test whether this already
had a measurable effect on total ozone values observed by the global network
of ground-based instruments. The model includes explanatory variables
describing the influence of various modes of dynamical variability and of
volcanic eruptions. In order to describe the anthropogenic influence a first
version of the model contains a linear trend (LT) term, whereas a second
version contains a term describing the evolution of Equivalent Effective
Stratospheric Chlorine (EESC). By comparing the explained variance of these
two model versions we evaluated, which of the two terms better describes the
observed ozone evolution. For a significant majority of the stations, the
EESC proxy fits the long term ozone evolution better than the linear trend
term. Therefore, we conclude that the Montreal Protocol has started to show
measurable effects on the ozone layer about twenty years after it became
legally binding. |
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