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An ensemble formulation of PBL fluxes in a GCMAn ensemble approach is applied to Planetary Boundary Layer (PBL) calculations with the bulk Richardson number identified as the key parameter. An ensemble averaging calculation was carried out to rederive the bulk friction and heat transport coefficients for the mean condition. Two simulations are carried out and compared. Significant differences in PBL fluxes low level cloudiness, land surface roughness heights, and surface evaporation are noted between the modified and unmodified simulations. Modifications to the model were: (1) the relationship between actual and potential Effective Temperature (ET) to accord with Sud and Fennessy (1982); (2) maximum permissible instantaneous ET at any time is 1.5 mm per hr; (3) moisture distribution in low level cumulus convection to be consistent with no precipitation; (4) appearance of supersaturation clouds to be consistent with supersaturation condition at that level; (5) invoking a simple function for stomatal diffusion effect in the ET calculation.
Document ID
19840014034
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Sud, Y. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, W. E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Res. Rev., 1983
Subject Category
Meteorology And Climatology
Accession Number
84N22102
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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