Wind Energy

4 Mean Wind and Turbulence in the Atmospheric Boundary Layer 25
scaling, and that the boundary layer height changes somewhat systematically
with z/L in the plots. For unstable conditions, σu/u∗ is known to depend on
h/L rather than on z/L, where h is the boundary layer height. This is likely
to explain the scatter for σu/u∗ for unstable condition.
We have not used h directly as a scaling parameter in this paper because it
is presently not measured. For the wind speed profiles we have not discussed
the unstable profiles much, but they are well described by the standard profile
formulations, surface layer leading to free convection and mixed layer formulations
as the height increases.
References
1. H. Panofsky. Tower Micrometeorology. In Workshop on Micrometeorology. Am.
Met. Soc., 151–176, 1972
2. R.B. Stull. An introduction to Boundary Layer Meteorology, Kluwer, 1988
3. D. Vickers and L. Mahrt. Observations of non-dimensional wind shear in a coastal
zone. Q.J.R. Meteorol. Soc., 125, 2685–2702, 1999
4. S. Zilitinkevich and I.N. Esau. Resistance and heat-transfer laws for stable and
neutral planetary boundary layers: Old Theory advanced and revaluated. Q.J.R.
Meteorol. Soc., 206, 131, 1863–1893, 2005
5. A.M. Sempreviva, S.E. Larsen, N.G. Mortensen, and I. Troen. Response of neutral
boundary layers to changes of roughness. BoundaryLayer Meteorol., 50, 205–225,
1990