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Abstract Results are presented from six micrometeorological studies conducted over a grass turf at Davis, California, in 1966 and 1967. Highly reliable surface drag and evaporation data from very sensitive lysimeters of 6·1 m diameter afforded excellent opportunity to evaluate several parameters important to aerodynamic‐prediction equations. For the six studies the mean von Kármán constant, k, ranged from 0·40 to 0·44, strongly supporting continued acceptance of k at around 0·42. The Monin‐Obukhov (1954) universal ϕ M function was found to vary as ∣Ri∣ −1/3 under near‐free convection, indicating significantly greater diabatic profile effects than suggested in the form of the KEYPS profile as given by Sellers (1965). Empirical relationships providing excellent fit to experimental data for the range −3·5 Ri > −2·0, KW/KM increased from 1·13 to 1·6. No expressions relating ϕ M and ϕ W or KW/KM to z/ L are presented due to uncertainties in Davis z/ L data. However, use of Davis Ri data in several published z/ L (Ri) relationships, allowed a limited comparison with results of previous studies.
Pruitt et al. (1973) studied this question.