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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 6 | Copyright
Atmos. Chem. Phys., 16, 4191-4203, 2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 31 Mar 2016

Research article | 31 Mar 2016

Stratospheric ozone changes under solar geoengineering: implications for UV exposure and air quality

Peer Johannes Nowack1, Nathan Luke Abraham1,2, Peter Braesicke3, and John Adrian Pyle1,2 Peer Johannes Nowack et al.
  • 1Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Cambridge, UK
  • 2National Centre for Atmospheric Science, University of Cambridge, Cambridge, UK
  • 3Karlsruhe Institute of Technology, IMK-ASF, 76344 Eggenstein-Leopoldshafen, Germany

Abstract. Various forms of geoengineering have been proposed to counter anthropogenic climate change. Methods which aim to modify the Earth's energy balance by reducing insolation are often subsumed under the term solar radiation management (SRM). Here, we present results of a standard SRM modelling experiment in which the incoming solar irradiance is reduced to offset the global mean warming induced by a quadrupling of atmospheric carbon dioxide. For the first time in an atmosphere–ocean coupled climate model, we include atmospheric composition feedbacks for this experiment. While the SRM scheme considered here could offset greenhouse gas induced global mean surface warming, it leads to important changes in atmospheric composition. We find large stratospheric ozone increases that induce significant reductions in surface UV-B irradiance, which would have implications for vitamin D production. In addition, the higher stratospheric ozone levels lead to decreased ozone photolysis in the troposphere. In combination with lower atmospheric specific humidity under SRM, this results in overall surface ozone concentration increases in the idealized G1 experiment. Both UV-B and surface ozone changes are important for human health. We therefore highlight that both stratospheric and tropospheric ozone changes must be considered in the assessment of any SRM scheme, due to their important roles in regulating UV exposure and air quality.

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Various forms of solar radiation management (SRM) have been proposed to counteract man-made climate change. However, all these countermeasures could have unintended side-effects. We add a novel perspective to this discussion by showing how atmospheric ozone changes under solar geoengineering could affect UV exposure and air pollution. This would have implications for human health and ecology. Atmospheric composition changes are therefore important to consider in the evaluation of any SRM scheme.
Various forms of solar radiation management (SRM) have been proposed to counteract man-made...