Eddy-covariance measurements

Turbulence is encountered in continuous transport of mass, heat and momentum between eddies of different size. Measurement of vertical turbulent fluxes within the atmospheric boundary layer is of great importance to quantify the exchange of various gases ( CH4, CO2, H2O, …) and energy in the Atmospheric Boundary Layer.

An accurate technique which is based on the calculation of the covariance between the vertical wind speed and the gas concentration at a specific height, is used to estimate the scalar/energy fluxes and is called Eddy-covariance measurement.

During the first campaign eddy-covariance measurement were performed at three 10 m high towers, which instruments attached at 2 m, 5m, and 10 m altitude. The main tower with the set of instruments used is shown in the photo below.