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Ensemble formulation of surface fluxes and improvement in evapotranspiration and cloud parameterizations in a GCMThe influence of some modifications to the parameters of the current general circulation model (GCM) is investigated. The aim of the modifications was to eliminate strong occasional bursts of oscillations in planetary boundary layer (PBL) fluxes. Smoothly varying bulk aerodynamic friction and heat transport coefficients were found by ensemble averaging of the PBL fluxes in the current GCM. A comparison was performed of the simulations of the modified model and the unmodified model. The comparison showed that the surface fluxes and cloudiness in the modified model simulations were much more accurate. The planetary albedo in the model was also realistic. Weaknesses persisted in the models positioning of the Inter-tropical convergence zone (ICTZ) and in the temperature estimates for polar regions. A second simulation of the model following reparametrization of the cloud data showed improved results and these are described in detail.
Document ID
19840065509
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sud, Y. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, W. E.
(NASA Goddard Space Flight Center Laboratory for Atmospheric Sciences, Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1984
Publication Information
Publication: Boundary-Layer Meteorology
Volume: 29
ISSN: 0006-8314
Subject Category
Meteorology And Climatology
Accession Number
84A48296
Funding Number(s)
CONTRACT_GRANT: NAS5-25900
Distribution Limits
Public
Copyright
Other

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