Institute of Atmospheric Physics;
Academia Sinicc.;
Beijing 100011 model dealing with interactions between the air and low stratiform clouds is presented based on the mixed-layer model Lilly (1968) pioneered and on Deardorffs three dimensional numerical model results. Its main new aspects lie in 1) consideration of the natures of both the atmosphere and cloud;
2) a new entrainment velocity scheme with few arbitrary assumptions;
3) transition from one-mixed layer to two-mixed layer model;
and 4) parameterization of radiation and precipitation calculations.The model results for radiation;
moisture;
and heat turbulent fluxes turn out to be in good agreement with those calculated or observed by Kawa (1988);
Nicholls (1984);
and Schmets et al. (1981) in California;
the North Sea;
and the North Atlantic;
respectively.Basically;
this paper furnishes the theoretical basis for a model to address questions concerning the time-evolution of thermodynamical profiles both in cloud and out of cloud. The applications of this model wil be in a separate paper.;
cloud; separate; arbitrary; moisture; Lilly; latter; instead; Atlantic; concerning; assumptions;