Convective trigger function for a mass-flux cumulus parameterization scheme

Hong, Song-You; Pan, Hua-Lu

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Convective trigger function for a mass-flux cumulus parameterization scheme

1997
By Hong, Song-You ; Pan, Hua-Lu
Series: Office note (National Centers for Environmental Prediction (U.S.)) ; 418

[PDF-3.94 MB]

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Personal Author:

Hong, Song-You ; Pan, Hua-Lu

Hong, Song-You ; Pan, Hua-Lu Less -
Corporate Authors:

National Centers for Environmental Prediction (U.S.)
NOAA Program & Office:

NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction)

NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction) Less -
Description:

A precipitation physics package for the NCEP Regional Spectral Model designed to improve the skill of precipitation forecasts is proposed. The package incorporates a prognostic grid-resolvable precipitation scheme and a parameterized convection scheme with a convective trigger function that explicitly couples boundary layer and convective precipitation processes. Comprehensive sensitivity experiments were conducted with a grid spacing of approximately 25 km for a heavy rain case over the United States during 15-17 May 1995. In this paper, the trigger function set-up in the convective parameterization scheme and its impact on the predicted precipitation are discussed. Special attention is given to the interaction of cloud properties in the parameterized convection with the evolution of grid-resolvable precipitation physics. The impact of convective forcing due to different convective triggers on the large-scale pattern downstream is also discussed. The implementation of the prognostic cloud scheme and performance are presented in our companion paper (Hong et al.1998).
Content Notes:

Song-You Hong, and Hua-Lu Pan.

"December 1997."

"This is an unreviewed manuscript, primarily intended for informal exchange of information among NCEP staff members."

System requirements: Adobe Acrobat Reader.

Includes bibliographical references (pages 38-41).
Keywords:

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Mathematical Models Numerical Analysis Numerical Weather Forecasting Precipitation Variability Weather Forecasting
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Office note (National Centers for Environmental Prediction (U.S.)) ; 418
Document Type:

Office Note
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United States
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Public Domain
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Library
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urn:sha256:ecd57131b0de7c83e4bb57f38daa08960eba3dfeb69b8c28ea7e0a949b5aa92c
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https://repository.library.noaa.gov/view/noaa/11423/noaa_11423_DS1.pdf
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Convective trigger function for a mass-flux cumulus parameterization scheme

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