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| Titel |
Linkages between ozone-depleting substances, tropospheric oxidation and aerosols |
| VerfasserIn |
A. Voulgarakis, D. T. Shindell  , G. Faluvegi |
| 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 ; 13, no. 9 ; Nr. 13, no. 9 (2013-05-14), S.4907-4916 |
| Datensatznummer |
250018648
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| Publikation (Nr.) |
 copernicus.org/acp-13-4907-2013.pdf |
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| Zusammenfassung |
| Coupling between the stratosphere and the troposphere allows changes in
stratospheric ozone abundances to affect tropospheric chemistry. Large-scale
effects from such changes on chemically produced tropospheric aerosols have
not been systematically examined in past studies. We use a
composition-climate model to investigate potential past and future impacts
of changes in stratospheric ozone depleting substances (ODS) on tropospheric
oxidants and sulfate aerosols. In most experiments, we find significant
responses in tropospheric photolysis and oxidants, with small but
significant effects on methane radiative forcing. The response of sulfate
aerosols is sizeable when examining the effect of increasing future nitrous
oxide (N2O) emissions. We also find that without the regulation of
chlorofluorocarbons (CFCs) through the Montreal Protocol, sulfate aerosols
could have increased by 2050 by a comparable amount to the decreases
predicted due to relatively stringent sulfur emissions controls. The
individual historical radiative forcings of CFCs and N2O through their
indirect effects on methane (−22.6 mW m−2 for CFCs and −6.7 mW m−2
for N2O) and sulfate aerosols (−3.0 mW m−2
for CFCs and +6.5 mW m−2 for N2O when considering the direct aerosol effect)
discussed here are non-negligible when compared to known historical ODS
forcing. Our results stress the importance of accounting for
stratosphere-troposphere, gas-aerosol and composition-climate interactions
when investigating the effects of changing emissions on atmospheric
composition and climate. |
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