About CLUBB

CLUBB is the short name for Cloud Layers Unified By Binormals. It is a parameterization of clouds and turbulence in the earth's atmosphere. It is designed to be a single, unified parameterization that models many cloud types plus clear convective and stable boundary layers. It is written in Fortran 90.

CLUBB is being actively developed by several researchers, including Chris Golaz at GFDL and Vincent Larson, David Schanen, Brian Griffin, and Joshua Fasching at University of Wisconsin --- Milwaukee. Past contributors include Adam Smith, Michael Falk, and Kurt Kotenberg. The BUGSrad radiative transfer scheme was kindly contributed by Drs. Norm Wood and Graeme Stephens of Colorado State University. The Morrison microphysics scheme was kindly contributed by Dr. Hugh Morrison of NCAR.

CLUBB is based on the the Assumed PDF Method. For more information about CLUBB, please see the following references:

  • 2005: "Using probability density functions to derive consistent closure relationships among higher-order moments." V. E. Larson and J.-C. Golaz. Mon. Wea. Rev., 133, 1023-1042. This describes some advances to the numerics of CLUBB.

  • 2002: "A PDF-based model for boundary layer clouds. Part I: Method and model description." J.-C. Golaz, V. E. Larson, and W. R. Cotton. J. Atmos. Sci., 59, 3540-3551. This is the single best overview of CLUBB's formulation.

  • 2002: "A PDF-based model for boundary layer clouds. Part II: Model results." J.-C. Golaz, V. E. Larson, and W. R. Cotton. J. Atmos. Sci., 59, 3552-3571. This provides sample results for cumulus, stratocumulus, and clear boundary layers.

  • 2002: "Small-scale and mesoscale variability in cloudy boundary layers: Joint three-dimensional probability density functions." V. E. Larson, J.-C. Golaz, and W. R. Cotton. J. Atmos. Sci., 59, 3519-3539. This formulates and tests the functional form of the probability density function, which is the main closure of the PDF method.