Traceflux: a small-scale tracer experiment at a forested site
by Eva van Gorsel, Mirela Goanta, Christian Bernhofer
International Journal of Environment and Pollution (IJEP), Vol. 25, No. 1/2/3/4, 2005

Abstract: Results from four successful tracer experiments carried out in a dense forest canopy are presented. For each experiment, sulphur hexafluoride SF6 was released from a point source in trunk space and air samples were collected at 19 horizontally distributed locations in the canopy. Meteorological measurements include fast-response turbulence data recorded at several locations in and above the forest. Measured mean concentrations of SF6 are compared against concentrations calculated by an analytical solution to the equation of diffusion. For near neutral and weak unstable conditions the model performs surprisingly well, even though the wind profile and turbulence statistics deviate substantially from surface layer characteristics. Still if more than an estimate of the concentration field is needed a more sophisticated model should be applied.

Online publication date: Wed, 31-Aug-2005

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