Atmos. Chem. Phys. Discuss., 13, 21427-21453, 2013
www.atmos-chem-phys-discuss.net/13/21427/2013/
doi:10.5194/acpd-13-21427-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Effects of stratospheric ozone recovery on tropospheric chemistry and air quality
H. Zhang1, S. Wu2, and Y. Wang3
1Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, Michigan, USA
2Atmospheric Sciences Program, Department of Geological and Mining Engineering and Sciences and Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, Michigan, USA
3Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Institute for Global Change Studies, Tsinghua University, Beijing, China

Abstract. The stratospheric ozone has decreased greatly since 1980 due to ozone depleting substances (ODSs). As a result of the implementation of the Montreal Protocol and its amendments and adjustments, stratospheric ozone is expected to recover towards its pre-1980 level in the coming decades. We examine the implications of stratospheric ozone recovery for the tropospheric chemistry and ozone air quality with a global chemical transport model (GEOS-Chem). Significant decreases in surface ozone photolysis rates due to stratospheric ozone recovery are simulated. Increases in ozone lifetime by up to 7% are calculated in the troposphere. The global average OH decreases by 1.74% and the global burden of tropospheric ozone increases by 0.78%. The perturbations to tropospheirc ozone and surface ozone show large seasonal and spatial variations. General increases in surface ozone are calculated for each season, with increases by up to 5% for some regions.

Citation: Zhang, H., Wu, S., and Wang, Y.: Effects of stratospheric ozone recovery on tropospheric chemistry and air quality, Atmos. Chem. Phys. Discuss., 13, 21427-21453, doi:10.5194/acpd-13-21427-2013, 2013.
 
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