Turbulent Exchange over varying terrain and ecosystem characteristics

Turbulent transport is a key mechanism for the exchange of mass, momentum and heat in the atmospheric boundary layer. While reasonably well understood over homogeneous surfaces, turbulent exchange becomes more complex in mountain regions due to factors like thermally-driven wind systems, terrain-induced pressure gradients and the influence of surface roughness. Across different terrain features and ecosystems, turbulent exchange is influenced by terrain shape and heterogeneity associated with topography, land cover and vegetation type, which has impacts on the exchange of heat and momentum as well as on the emission and dispersion of trace gases. Especially the latter has important implications for the atmospheric composition and air quality interactions between atmosphere and biosphere. This session invites researchers to discuss challenges and strategies in measuring and modelling of turbulent flows and biogenic fluxes across complex surfaces and ecosystems while also covering wide-spread measurement techniques such as the eddy covariance method.