STABILITY DEPENDENCE OF THE EDDY-ACCUMULATION COEFFICIENTS FOR MOMENTUM AND SCALARS

From a set of turbulence data collected with a three-axis sonic anemom eter/thermometer and described in a companion paper, we simulate the e ddy-accumulation process for sensible heat and momentum fluxes. The re sulting eddy-accumulation coefficient for momentum clearly depends on surface-layer stability; at neutral stability, its value is 0.63. On s upplementing the scalar eddy-accumulation coefficients that we derive from our sensible heat flux data with values of sensible and latent he at flux coefficients reported by Businger and Oncley, we also find tha t scalar eddy-accumulation coefficients depend on stability though mor e weakly than does the momentum coefficient. The coefficients for sens ible and latent heat show no significant difference; we, thus, fit the m with one function of stability whose value is 0.52 for neutral strat ification.