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This paper describes the coupling of the Community Atmosphere Model (CAM) version 5 with a unified  multi-variate probability density function (PDF) parameterization, Cloud Layers Unified by  Binormals (CLUBB). CLUBB replaces the planetary boundary layer (PBL), shallow convection, and  cloud macrophysics schemes in CAM5 with a higher-order turbulence closure based on an assumed PDF.  Comparisons of single-column versions of CAM5 and CAM-CLUBB are provided in this paper for several  boundary layer regimes. As compared to large eddy simulations (LESs), CAM-CLUBB and CAM5 simulate  marine stratocumulus regimes with similar accuracy. For shallow convective regimes, CAM-CLUBB  improves the representation of cloud cover and liquid water path (LWP). In addition, for shallow  convection CAM-CLUBB offers better fidelity for subgrid-scale vertical velocity, which is an  important input for aerosol activation. Finally, CAM-CLUBB results are more robust to changes in  vertical and temporal resolution when compared to CAM5

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Unified parameterization of the planetary boundary layer and shallow convection with a higher-order turbulence closure in the Community Atmosphere Model: single-column experiments