Anthropogenic emissions of greenhouse gases and ozone depleting substances have caused substantial changes in the chemical composition of the middle atmosphere that, in turn, can influence tropospheric processes. For example, increasing greenhouse gases are expected to modify the large-scale circulation of the stratosphere, the Brewer-Dobson circulation (BDC), and the stratospheric abundance of radiatively active gases, notably ozone and water vapour. Such changes in the BDC and composition affect the exposure of the biosphere to harmful UV radiation and can feed back on surface climate through their influence on radiative forcing and tropospheric dynamics. In addition, long-term changes in the ozone layer (e.g. ozone hole and recovery) strongly influence the tropospheric circulation in the Southern Hemisphere. These changes are further coupled to a variety of Earth system feedbacks. We welcome abstracts which explore middle-atmosphere composition changes, their impacts on tropospheric climate and composition, and resulting feedbacks. Abstracts may address these issues on time-scales encompassing inter-annual to centennial timescales, as well as impacts ranging from the tropics to poles and globally. Research might also concern long-term ozone trends (depletion and recovery), as well as changes in the upper troposphere and lower stratosphere (UTLS) region. We welcome contributions exploring these topics using chemistry-climate and Earth system models, Earth observations, as well as contributions on novel methodological approaches (as e.g. machine learning) to gain insights into composition changes, related feedbacks and theoretical studies.
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