Biogenic Volatile Organic Compounds (BVOCs) are a group of highly reactive chemical compounds that are emitted by the terrestrial biosphere. They play a crucial role in atmospheric chemistry by contributing to the formation of tropospheric ozone, secondary organic aerosols (SOA), and cloud condensation nuclei, thereby influencing both air quality and climate processes. However, quantifying their turbulent exchange in complex terrain remains challenging due to the interplay of measurement complexities, heterogeneous surface properties, thermally-driven circulations, and vegetation variability.

In summer 2025, we will conduct an intensive field campaign at the Forest Atmosphere Interaction Research (FAIR) Station in Mieming, Tirol, Austria—a forest with a Pinus sylvestris canopy with Juniperus communis understory. The station is equipped with a 30 m flux tower, heated Teflon sampling line and an air-conditioned instrument container. BVOC concentrations will be measured using Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-ToF-MS), and turbulent fluxes will be derived via the eddy covariance method.

This study aims to characterize the temporal variability of BVOC fluxes and evaluate how terrain-driven atmospheric dynamics influence their exchange. Additionally, we will compare observed fluxes to predictions from the MEGAN 2.1 emission model.

This contribution will provide insights into the challenges of measuring and modeling biogenic fluxes over complex terrain and highlight strategies to improve process understanding and model evaluation in mountainous environments.