Abstract
The study focuses on a way to parameterize the effect of subgrid scale convective motions on surface fluxes in large scale and regional models for the case of light surface winds. As previously proposed, these subgrid effects are assumed to scale with the convection intensity through the relationship: \(\overline U ^2 = U_0^2 + (\beta w_* )^2\) where \(\overline U\) is the mean velocity of the wind, U0 the velocity of the mean wind, w* the free convection velocity, and β an empirical coefficient to be determined. Both observations and numerical simulation are presently used to determine the free convection coefficient β.
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