Science online: "Do we really understand the ozone hole? New insights into stratospheric chlorine chemistry", Dr. Jens-Uwe Grooß (ICE-4) (in german)
Link: https://go.fzj.de/wo
Besucher Service
The lecture will take place on MS Teams: https://go.fzj.de/wo
This lecture will be held in german.
Background:
In 1985, scientists were very surprised by the discovery of the ozone hole over Antarctica, which no one had predicted. Within a few years, the scientific explanation for the formation of the ozone hole was found. The ozone hole is caused by anthropogenic emissions of chlorofluorocarbons (CFCs). Very quickly, an effective international treaty was concluded with the Montreal Protocol to reduce CFC emissions to zero.
The ban on CFCs agreed in the Montreal Protocol is expected to lead to recovery by around 2060, and the first signs of this recovery are already visible. The essential aspects of stratospheric chemistry seem to be understood, and the models are actually quite good at describing the ozone hole that forms every year in the Antarctic spring.
However, a doctoral thesis at the FZJ in 2012 found that the temporal development of hydrogen chloride (HCl) over Antarctica at the beginning of winter differs significantly from observations. This discrepancy is also present in other common atmospheric models, but the cause has long been unclear.
What is presented:
The lecture will first explain the scientific basis for the formation of the ozone hole and then show the as yet unexplained discrepancy in hydrogen chloride. The results of our current study (Comm. Earth & Env., 6, 496, doi:10.1038/s43247-025-02499-4) will then be presented. In this study, we present the chemical reactions that may be missing in the models in order to correct this discrepancy. We also show the impact these additional reactions would have on the ozone hole.
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