Atmos. Chem. Phys. Discuss., 12, 25551-25572, 2012
www.atmos-chem-phys-discuss.net/12/25551/2012/
doi:10.5194/acpd-12-25551-2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Linkages between ozone depleting substances, tropospheric oxidation and aerosols
A. Voulgarakis1,*, D. T. Shindell1, and G. Faluvegi1
1NASA Goddard Institute for Space Studies and Columbia University Center for Climate Systems Research, New York, USA
*now at: Department of Physics, Imperial College, London, UK

Abstract. 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 historical radiative forcing of CFCs through their indirect effects on methane (−22.6 mW m−2) and sulfate aerosols (−3.0 mW m−2) discussed here is non-negligible when compared to known historical CFC 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.

Citation: Voulgarakis, A., Shindell, D. T., and Faluvegi, G.: Linkages between ozone depleting substances, tropospheric oxidation and aerosols, Atmos. Chem. Phys. Discuss., 12, 25551-25572, doi:10.5194/acpd-12-25551-2012, 2012.
 
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