
CRCM 
ECPC/ECP2 
HRM3 
MM5I 
RCM3 
WRFP/WRFG 
Dynamics 
Nonhydrostatic, Compressible 
Hydrostatic, Incompressible 
Hydrostatic, Compressible 
Nonhydrostatic, Compressible 
Hydrostatic, Compressible 
Nonhydrostatic, Compressible 
Lateral Boundary Treatment 
9 points (Davies 1976); spectral nudging of horizontal wind. 
Perturbations relaxed at boundaries; spectral filter 
4 points (Davies and Turner 1977) 
4 points (linear relaxation) 
12 points (exponential relaxation) 
15 grid points (exponential relaxation) 
Land Surface 
CLASS 
NOAH 
MOSES 
NOAH 
BATS 
NOAH 
Thermal/Water Layers 
3/3 
4/4 
4/4 
4/4 
1/3 
4/4 
Vegetation Types 
21 vegetation classes 
13 classes 
53 classes (Wilson and Henderson Sellers 1985) 
16 classes from USGS SiB model 
19 classes 
24 classes from USGS 
Boundary Layer 
Local K, gradient Richardson number formulation 
HongPan nonlocal K 
First order turbulent mixing 
HongPan (MRF) countergradient, nonlocal K 
Nonlocal K, countergradient flux 
Yonsei Univ. (explicit entrainment) 
Explicit Moist Physics 
Removal of supersaturation 
Removal of supersaturation 
Prognostic cloud liquid and ice; liquid potential temperature 
Dudhia simple ice 
SUBEX, prognostic cloud water 
Prognostic cloud liquid and ice, rain, snow 
Cumulus Parameterization 
Mass Flux 
Simplified Arawaka Schubert 
Mass Flux, including downdraft 
Kain Fritsch2 mass flux 
Grell with Fritsch Chappell closure 
Kain Fritsch2 mass flux [WRFP] / Grell [WRFG] 
Number of Vertical Levels 
29 
28 
19 
23 
18 
35 
Type of Vertical Coordinate 
GalChen scaledheight 
Normalized pressure 
Hybrid terrain following & pressure 
Sigma 
Terrain following 
Terrain following 
Original Grid Size* 
160 x 135 
193 x 152 
171 x 146 
154 x 129 
160 x 130 
155 x 130 
Sponge Zone Depth (pts)** 
10 
23 (x) / 18 (y) 
8 
15 
13 
10.5 
Length of Timestep 
900 Seconds 
100 seconds 
300 Seconds 
120 seconds 
150 Seconds 
150 seconds 
tasmin/tasmax Calculation*** 
timestep 
timestep 
timestep 
timestep 
3hourly 
hourly 
Spectral Nudging 
Yes 
Yes 
No 
No 
No 
No 
Longwave Radiation Scheme 
Morcrette (1984) 
Chou and Suarez (1994) 
PRECIS 
RRTM 
CCM3 
CAM3 
Shortwave Radiation scheme 
Fouquart and Bonnel (1980) 
Chou (1992) 
PRECIS 
MM5 cloud scheme (not CCM2) 
CCM3 
CAM3 
Uniform Aerosols? 
No 
Yes 
No 
Yes 
Yes 
Yes* *(ozone varies) 