Vertical profiles, up to 914 m, of simultaneous measurements of the rate of dissipation of temperature variance (N) and turbulent kinetic energy (E), in certain broad classifications are presented. The statistical distribution of the data, which appears to be closely log-normal is discussed. The profiles presented here are compared with those of other workers in the field and it is seen that a broad description of typical vertical profiles of N can now be added to that of E. An attempt is made to estimate the stability and heat flux in the various classes by applying simplified energy-balance equations re-written in surface-stress layer form to the observations at 37 m. Nomenclature 9 k n Boundary-Layer Meteorology 5 (1974) 489-503. All Rights Reserved Copyright 0 1974 by D. Reidel Publishing Company, Dordrecht-Holland S. J. CAUGHEY AND R. RAYMENT contribution to the standard deviation of the inclination, within frequency bands denoted by the subscripts 1 and 2 contribution to the standard deviation of the temperature T within frequency bands denoted by the subscripts 1 and 2. rate of destruction of turbulent kinetic energy per unit mass of air (cm" sb3) rate of dissipation of temperature variance (+ 0;) ('C2 s-l) Coriolis parameter eddy coefficient for vertical heat transfer non-dimensional eddy coefficient for vertical heat transfer (= K&/u;) sensible heat flux H/H,, (subscript 0 denotes the constant-stress layer value) Clarke's stability parameter (= -gH,/~,,c,,B,u~f ) the fluctuation about the mean of the rate of heating per unit volume by radiation or the release of latent heat -H,,/p,c,u, (Clarke's definition of T.J -ffolwpku, zflu*