1. Stratospheric transport and dynamics, including but not limited to tracer (e.g., age of air, ozone) transport and mixing, Brewer-Dobson circulation (BDC), quasi-biennial oscillation (QBO), stratospheric turbulence, wave activities, and sudden stratospheric warming (SSW). 
2. Stratospheric aerosols and chemical tracers from either natural (e.g., volcano eruptions, wildfire, deep convections) or anthropogenic activities (e.g., rocket/aircraft emissions, satellite re-entry, stratospheric aerosol injections), such as aerosol/plume dispersion and transport, aerosol nucleation and microphysical growth, aerosol radiative effects, aerosol-cloud interactions (e.g., PSCs).
3. nteractions between stratosphere and troposphere, such as stratosphere-troposphere exchange (STE) and stratospheric influences on surface climate (e.g., subseasonal to seasonal predictability). 

Observational, modeling, theoretical, and machine-learning studies are all welcome in this session.

• GC - Global Environmental Change
• NH - Natural Hazards
• PP - Paleoceanography and Paleoclimatology
• V - Volcanology, Geochemistry and Petrology