Dispersion Experiments from the 213 m High Meteorological Mast at Cabauw in the Netherlands

Because only few experimental data exist on the diffusion from high sources, a series of dispersion experiments was performed from a 213 m high meteorological mast. The tracer SF6, which was released at either 80 m or 200 m, was sampled at one measuring arc situated at 3 - 5 km from the mast. From the ground level concentration distribution we obtained values for the dispersion coefficients oy and oz. These parameters are compared with the dispersion coefficients of Pasquill-Gifford. They are also compared with the standard deviations of the wind direction fluctuations, measured at the source height. The results of fourteen experiments are discussed.