Abstract: A new parameterization for turbulent transport is proposed, in order to represent the behavior of stratocumulus-topped boundary-layers, in which combined effects of large-scale subsidence, cloud-top radiative cooling, precipitation, turbulence, etc., account for the development of a stable cloudy layer. The parameterization is based on Taylor's hypothesis of frozen turbulence, assuming that the eddy viscosity is proportional to the wavelength corresponding to the maximum value in the vertical velocity variance spectrum. The dada used to build the parameterization were collected during the 2nd Aerosol Characterization Experiment (ACE2). Tested in a single-column model, the parameterization produced results in acordance to the observations for different degrees of coupling between the mixing layer and the stratocumulus layer.