SCALE Regional Model (SCALE-RM)

SCALE-RM is a regional atmospheric model using the SCALE library.

Brief Description

Framework

  • The three-dimensional (3D) Cartesian grid system based on actual distance
  • 2D domain decomposition by Message Passing Interface (MPI) communication
  • Several map projections commonly used
  • Domain nesting system ( one-way, i.e., data transfer from parent domain to child domain. )
    • On-line nesting: concurrent execution of multiple domains).
    • Offline nesting: execution of computation in an inner domain after that in an outer domain.
  • Collective execution system of multiple cases, i.e., bulk job system
  • netCDF file I/O based on CF (Climate and Forecast) convention
    • Selection of netCDF 3 and netCDF 4 formats
  • Generation of initial data for an ideal experiment
  • Generation of topographical and land-use data, converted from external data
  • Generation of initial and boundary data from external data

Dynamical core

  • Grid system : Arakawa-C type
  • Governing equations: 3D fully compressible non-hydrostatic equations
  • Spatial descretization: finite volume method
    • 2nd-, 4th-, and 6th-order central differences
    • 3rd- and 5th-order upwind differences
  • Time integration: selection from the “fully explicit method” or the “horizontally explicit and vertically implicit methods”
  • Guarantee of non-negative value:
    • Flux corrected transport method (Zalesak, 1979)
    • Koren (1993)’s filter: available only with the use of the 3rd-order upwind scheme
  • Numerical filter: 4th-order hyper-viscosity and diffusion
  • Topography: expressed using terrain-following coordinates
Throughput of File Creation

Figure:Schematic illustration of grid system

Physical processes

Documents

The description for SCALE-RM is available at SCALE Document page