The composition of the upper troposphere and the lower stratosphere (UTLS) plays a key role in the climate system. Our understanding of the interactions between dynamics, chemistry, and climate in this region is rapidly advancing thanks to both observational and modeling studies. In this session, we invite presentations on dynamical, transport, and chemical processes determining the variability and long-term trends in the composition of the UTLS, and related effects on radiation and dynamics. We particularly encourage contributions that introduce recent observations (both in situ and remote sensing) and models of various complexity ranging from comprehensive chemistry climate models to idealized and conceptual models.
This year, field campaigns of special focus include recent projects that explore atmospheric transport, composition, and chemical processes in the spring Arctic UTLS, like ASCCI 2025 and COLD SABRE 2023.
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