  The multi-scale transport and exchange processes in the atmosphere over
mountains -- programme and experiment (TEAMx) wants to advance the
understanding of transport and exchange processes over mountainous terrain as
well as to collect unique multi-scale datasets that can be used, e.g., for
process studies, model development and model evaluation. The TEAMx
Observational Campaign (TOC) is planned to take place between 2024 and 2025. In
summer 2022 a TEAMx pre-campaign (TEAMx-PC22) was conducted in the Inn Valley
and one of its tributaries, the Weer Valley, to test the suitability and
required logistics of measurement sites, to evaluate their value for the main
campaign, and to test new observation techniques in complex terrain.
Scientifically, this campaign focused on resolving the mountain boundary layer
and valley wind systems on multiple scales. Through the combined effort of six
institutions the pre-campaign can be deemed successful. A detailed description
of the setup at each sub-target area is given. Due to the spatial distribution
of instruments and their spatio-temporal resolution, atmospheric processes and
phenomena like valley winds have been investigated at different locations and
on different scales. Furthermore, scale interactions were detected and are
discussed in detail in two example cases. Additionally, observational gaps were
determined which should be closed for the TOC. Data of the pre-campaign are
publicly available online and can be used for process studies, demonstrating
the utility of new observation methods, model verification, and for data
assimilation.
