Potential depletion of ozone in the mid-latitude lowermost stratosphere in summer under geoengineering conditions / Sabine Robrecht. Jülich : Forschungszentrum Jülich GmbH, [2021]
Inhalt
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- Motivation
- Introduction to stratospheric chemistry and dynamics
- Basics of stratospheric dynamics
- The lowermost stratosphere
- Stratospheric ozone chemistry
- Climate change and sulfate geoengineering
- Numerical models
- Introduction to numerical atmospheric models
- Chemical Lagrangian Model of the Stratosphere
- Geoengineering Large Ensemble Simulations
- Chlorine activation and ozone loss in the mid-latitude lowermost stratosphere
- Model setup
- Mechanism of mid-latitude ozone chemistry
- Analysis of chlorine activation
- Sensitivity of the water vapour threshold
- Explanation of the water vapour threshold
- Temperature dependence
- Case studies
- Discussion of the results
- Summary
- Potential for future mid-latitude ozone loss in the lowermost stratosphere
- Setup of Simulations
- Analysing the GLENS mixing layer above central North America
- Comparing the GLENS mixing layer today with measurements
- Change in the chemical composition of the mixing layer
- Comparison of GLENS results with chlorine activation thresholds
- Analysis of chlorine activation thresholds
- Likelihood for ozone destruction today and in future
- Impact of heterogeneous chlorine activation on ozone in the lowermost stratosphere
- Relevance of heterogeneous chlorine activation in the mixing layer for the mid-latitude ozone column
- Likelihood of heterogeneous chlorine activation and its impact on ozone for low temperatures
- Discussion
- Summary
- Conclusions
- Appendix
- Chemical species and reactions in CLaMS
- Tracer-Tracer correlations
- Maintenance of activated chlorine
- MACPEX case
- Comparison of the GLENS mixing layer with START08 measurements
- Abbreviations and Glossary
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