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Large climate-induced changes in ultraviolet index and stratosphere-to-troposphere ozone flux

Abstract

Now that stratospheric ozone depletion has been controlled by the Montreal Protocol1, interest has turned to the effects of climate change on the ozone layer2,3. Climate models predict an accelerated stratospheric circulation4,5,6, leading to changes in the spatial distribution of stratospheric ozone2,7 and an increased stratosphere-to-troposphere ozone flux8,9. Here we use an atmospheric chemistry climate model to isolate the effects of climate change from those of ozone depletion and recovery on stratosphere-to-troposphere ozone flux and the clear-sky ultraviolet radiation index—a measure of potential human exposure to ultraviolet radiation. We show that under the Intergovernmental Panel on Climate Change moderate emissions scenario10, global stratosphere-to-troposphere ozone flux increases by 23% between 1965 and 2095 as a result of climate change. During this time, the clear-sky ultraviolet radiation index decreases by 9% in northern high latitudes—a much larger effect than that of stratospheric ozone recovery—and increases by 4% in the tropics, and by up to 20% in southern high latitudes in late spring and early summer. The latter increase in the ultraviolet index is equivalent to nearly half of that generated by the Antarctic ‘ozone hole’ that was created by anthropogenic halogens. Our results suggest that climate change will alter the tropospheric ozone budget and the ultraviolet index, which would have consequences for tropospheric radiative forcing11, air quality8 and human and ecosystem health12.

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Figure 1: Predicted changes in the residual vertical velocity and ozone.
Figure 2: Predicted changes in STE ozone flux.
Figure 3: Predicted changes in ultraviolet index.

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References

  1. World Meteorological Organization. Scientific Assessment of Ozone Depletion: 2006, WMO/U.N. Environ. Prog. Rep. 50 (WMO, 2007).

  2. Shepherd, T. G. Dynamics, stratospheric ozone, and climate change. Atmos. Ocean 46, 117–138 (2008).

    Article  Google Scholar 

  3. Waugh, D. W. et al. Impacts of climate change on stratospheric ozone recovery. Geophys. Res. Lett. 36, L03805 (2009).

    Google Scholar 

  4. Butchart, N. & Scaife, A. A. Removal of chlorofluorocarbons by increased mass exchange between the stratosphere and troposphere in a changing climate. Nature 410, 799–802 (2001).

    Article  Google Scholar 

  5. Butchart, N. et al. Simulations of anthropogenic change in the strength of the Brewer–Dobson circulation. Clim. Dyn. 27, 727–741 (2006).

    Article  Google Scholar 

  6. McLandress, C. & Shepherd, T. G. Simulated anthropogenic changes in the Brewer–Dobson circulation, including its extension to high latitudes. J. Clim. 22, 1516–1540 (2009).

    Article  Google Scholar 

  7. Li, F., Stolarski, R. S. & Newman, P. A. Stratospheric ozone in the post-CFC era. Atmos. Chem. Phys. 9, 2207–2213 (2009).

    Article  Google Scholar 

  8. Stevenson, D. S. et al. Multimodel ensemble simulations of present-day and near-future tropospheric ozone. J. Geophys. Res. 111, D8301 (2006).

    Article  Google Scholar 

  9. Denman, K. L. et al. in IPCC Climate Change 2007: The Physical Science Basis (eds Solomon, S. et al.) (Cambridge Univ. Press, 2007).

    Google Scholar 

  10. Intergovernmental Panel on Climate Change. Special Report on Emissions Scenarios: A Special Report of Working Group III of the Intergovernmental Panel on Climate Change (Cambridge Univ. Press, 2000).

  11. Forster, P. & Shine, K. Radiative forcing and temperature trends from stratospheric ozone changes. J. Geophys. Res. 102, 10841–10855 (1997).

    Article  Google Scholar 

  12. United Nations Environment Program. Environmental Effects of Ozone Depletion and its Interactions with Climate Change: 2006 Assessment ISBN: 978-92-807-2821-7 (UNEP, 2006).

  13. Waugh, D. W. The age of stratospheric air. Nature Geosci. 2, 14–16 (2009).

    Article  Google Scholar 

  14. Engel, A. et al. Age of stratospheric air unchanged within uncertainties over the past 30 years. Nature Geosci. 2, 28–31 (2009).

    Article  Google Scholar 

  15. Austin, J. et al. Uncertainties and assessments of chemistry-climate models of the stratosphere. Atmos. Chem. Phys. 3, 1–27 (2003).

    Article  Google Scholar 

  16. Eyring, V. et al. Multimodel projections of stratospheric ozone in the 21st century. J. Geophys. Res. 112, D16303 (2007).

    Article  Google Scholar 

  17. de Grandpré, J. et al. Ozone climatology using interactive chemistry: Results from the Canadian middle atmosphere model. J. Geophys. Res. 105, 26475–26491 (2000).

    Article  Google Scholar 

  18. Scinocca, J., McFarlane, N. A., Lazare, M., Li, J. & Plummer, D. Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere. Atmos. Chem. Phys. 8, 7055–7074 (2008).

    Article  Google Scholar 

  19. Eyring, V. et al. Assessment of temperature, trace species, and ozone in chemistry-climate model simulations of the recent past. J. Geophys. Res. 111, D22308 (2006).

    Article  Google Scholar 

  20. Waugh, D. W. & Eyring, V. Quantitative performance metrics for stratospheric-resolving chemistry-climate models. Atmos. Chem. Phys. 8, 5699–5713 (2008).

    Article  Google Scholar 

  21. Andrews, D. G., Holton, J. R. & Leovy, C. B. Middle Atmosphere Dynamics (Academic, 1987).

    Google Scholar 

  22. Shepherd, T. G. Transport in the middle atmosphere. J. Meteorol. Soc. Japan 85B, 165–191 (2007).

    Article  Google Scholar 

  23. Jonsson, A. I., de Grandpré, J., Fomichev, V. I., McConnell, J. C. & Beagley, S. R. Doubled CO2-induced cooling in the middle atmosphere: Photochemical analysis of the ozone radiative feedback. J. Geophys. Res. 109, D24103 (2004).

    Article  Google Scholar 

  24. Hsu, J., Prather, M. J. & Wild, O. Diagnosing the stratosphere-to-troposphere flux of ozone in a chemistry transport model. J. Geophys. Res. 110, D19305 (2005).

    Article  Google Scholar 

  25. Madronich, S. Analytic formula for the clear-sky UV index. Photochem. Photobiol. 83, 1537–1538 (2007).

    Article  Google Scholar 

  26. Tourpali, K. et al. Clear sky UV simulations in the 21st century based on ozone and temperature projections from chemistry-climate models. Atmos. Chem. Phys. 9, 1165–1172 (2009).

    Article  Google Scholar 

  27. Randall, D. A. et al. in IPCC Climate Change 2007: The Physical Science Basis (eds Solomon, S. et al.) (Cambridge Univ. Press, 2007).

    Google Scholar 

  28. World Meteorological Organization. Scientific Assessment of Ozone Depletion: 2002, Global Ozone Research and Monitoring Project Rep. 47 (WMO, 2003).

  29. Appenzeller, C., Holton, J. & Rosenlof, K. Seasonal variation of mass transport across the tropopause. J. Geophys. Res. 101, 15071–15078 (1996).

    Article  Google Scholar 

  30. Olsen, M. A., Schoeberl, M. R. & Douglass, A. R. Stratosphere–troposphere exchange of mass and ozone. J. Geophys. Res. 109, D24114 (2004).

    Article  Google Scholar 

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Acknowledgements

The authors would like to acknowledge helpful discussions with V. Fioletov on ultraviolet index and C. McLandress on STE ozone fluxes. This study has been financially supported by the Canadian Foundation for Climate and Atmospheric Sciences (CFCAS) through the C-SPARC project, which provided the CMAM simulations.

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M.I.H. initiated the project and analysed the model data. T.G.S. helped in the data interpretation and with the writing of the manuscript.

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Correspondence to Michaela I. Hegglin.

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Hegglin, M., Shepherd, T. Large climate-induced changes in ultraviolet index and stratosphere-to-troposphere ozone flux. Nature Geosci 2, 687–691 (2009). https://doi.org/10.1038/ngeo604

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