Mixing line analysis of clouds and cloudy boundary layers.

The diagnostic study of the thermodynamic structure of nonprecipitating clouds and cloudy boundary layers is formulated using a mixing line and saturation point approach. A parametric model for the mean structure is developed as a tool for diagnostic and prognostic modeling. Cloud-scale mixing process are analyzed in the same framework, together with the energetics of the evaporative instability in cumulus clouds. A velocity scale emerges for this evaporative instability. The statistical study of saturation level distribution in partially cloudy boundary layers is proposed to related cloud fraction to the mean thermodynamic mixing processes.

Related paper: Betts, A. K., 1982: Saturation Point Analysis of Moist Convective Overturning.

Related paper: Betts, A. K., 1982: Cloud Thermodynamic Models in Saturation Point Coordinates.

Related paper: Betts, A. K., 1983: Thermodynamics of mixed stratocumulus layers: saturation point budgets.

Related paper: Betts, A. K., 1984: Boundary layer thermodynamics of a High Plains severe storm

Related paper: Betts, A. K., 1986: A new convective adjustment scheme. Part I

Related paper: Betts, A. K. and M.J. Miller, 1986: A new convective adjustment scheme. Part II