Mid-latitude stratospheric ozone loss during summer caused by enhanced sulphate aerosol due to climate engineering
The impact of stratospheric sulphur injections and climate change on the ozone column in the mid-latitudes are a matter of debate. Anderson et al. (2012) proposed an ozone loss mechanism affecting the mid-latitude ozone layer in summer. This ozone loss could be intensified by climate change, yielding stratospheric moistening, and climate engineering, leading to enhanced sulphur concetrations. The mechanism comprises inorganic chlorine activation on the surface of cold condensed particles followed by catalytic ozone loss cycles similar to polar ozone chemistry.
We analysed the processes of heterogeneus chlorine activation and catalytic ozone loss using a box-model study of CLaMS based on enhanced water vapor measurements from the MACPEX campaign in April 2011. As a result of these studies we discuss the details of the proposed chemical ozone loss mechanism and its sensitivity to various conditions. Varying water vapor content and sulphate concentrations in model-runs we test the effect of stratospheric moistening and additional sulphate aerosol particles on ozone. This allows us to estimate the potential risk of climate engineering for the mid-latitude ozone layer.
Sabine Robrecht is holding a Master's degree in chemistry (2016, focus on Physical chemistry) from the University Bielefeld. Since February 2017 she is a PhD student at the Forschungszentrum Jülich. Her research is focused on the potential stratospheric ozone loss in the mid-latitudes due to enhanced sulphate concentrations, caused by SRM, in combination with increased water vapor ratios.