Rossby-number similarity functions for the planetary boundary layer are evaluated from surface observations and wind and temperature profiles up to 2 km gathered during the Laverton Serial Sounding Experiment (Bureau of Meteorology 1968). This site is in inhomogeneous terrain, permitting a comparison with results from the more usual 'flat' sites. Surface stress and turbulent heat flux are derived from analysis of balloon trajectories using an adaption of the 'velocity deficit' method, and near-surface flux-profile relationships. The dependence of similarity functions A, B and C upon stability parameter µ and non-dimensional thermal wind shear components is examined and compared with previous results. Surface stress derived from analysis of balloon trajectories is found to exceed that de-rived from near-surface flux-profile relationships, and corresponds to an effective roughness length of 0.75 m. The implications of this are discussed.
Brook et al. (Fri,) studied this question.