During field investigations we used Gill ultrasonic anemometer to obtain data about turbulence on a height 2 meters from surface. Using this data (friction velocity, MO length scale, calculated z0 etc.) we want to calculate eddy diffusivity for tracers in layer between 0 (on a height z0+d) and 6 meters. How we can check that famous universal functions (Hogstrom or Businger-Dyer) work in a normal way in certain conditions. Surface seems to be not homogeneous on our site.
I know one simple approach - if calculated z0 values extremely differ from expected (expected z0 is 12% of height of roughness elements such as vegetation according to literature), then MO theory universal functions are not valid.
Can anybody suggest something else?
Reading papers on this topic, I made two additional notes:
1. For this layer (0-6 meters) it necessary to use corrections of universal functions for roughness sub-layer.
2. Numerous papers suggest simple approach - using filters. For example, u*>0.1 m/s.
Dear Alexander;
The stability model is described in the European Wind Atlas (WAsP). The model is based on M-O similarity theory, but the procedure is simplified so it only requires input of the mean and RMS values of the on- and off-shore heat fluxes. The Sensible Heat Fluxes for Neutral and Slightly Stable atmospheric stability were provide the best results.
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