Welcome to the NOAA Institutional Repository | Convective trigger function for a mass-flux cumulus parameterization scheme - :11423 | National Weather Service (NWS)
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
Convective trigger function for a mass-flux cumulus parameterization scheme
  • Published Date:
    1997
Filetype[PDF - 3.94 MB]


Details:
  • Corporate Authors:
    National Centers for Environmental Prediction (U.S.)
  • Series:
    Office note (National Centers for Environmental Prediction (U.S.)) ; 418
  • Document Type:
  • 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).

  • Supporting Files:
    No Additional Files