Abstract
Field data for the unstable, baroclinic, atmospheric boundary layer over land and over the sea are considered in the context of a general similarity theory of vertical heat transfer. The dependence of δθ/θ*upon logarithmic functions of hczTand stability (through the similarity function C) is clearly demonstrated in the data. The combined data support the conventional formulation for the heat transfer coefficient δθ/θ* when, (a) the surface scaling length is zT(« z0), the height at which the surface temperature over land is obtained by extrapolation of the temperature profile (b) the height scale is taken as the depth of convective mixing hc (c) the temperature profile equivalent of the von Karman constant is taken as 0.41 (d) areal average, rather than single point, values of δθ are employed in strongly baroclinic conditions. No significant effect of baroclinity or the height scale ratio as proposed in the general theory is found. Variations in C about a linear regression relation against stability are most probably due to uncertainties in the areal surface temperature and to experimental errors in general temperature measurements.
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