NCAR CSM Flux Coupler, version 4.0 -- User's Guide         Table of Contents

9   List of Physical Constants

The important constants in the CSM model are listed below along with their numerical values, which are set in the Flux Coupler. The last coefficient, for ice/ocn stress, is a special case because it is also used in the ice model and must have the same value there for consistency. This constant occurs in both the Coupler and ice models because the determination of the ice/ocn stress is a special case in the present CSM setup.

Constants Set in the Flux Coupler and Their Values

rhoa - air density 1.2 kg/m³
Cpa - heat capacity of air 1005 J/kg/°K
(rho Cp)a - air density × heat capacity 1206 J/m³/°K
Cpv - heat capacity of water vapor 1810 J/kg/°K
Cvir = Cpv/Cpa   - 1 0.80
Zvir = R v/R a   - 1 0.606
lambdaV - latent heat of vaporization 2500000 J/kg
lambdaF - latent heat of fusion 334000 J/kg
lambdaS - latent heat of sublimation 2834000 J/kg
rhof - density of freshwater 1000 kg/m³
rhoo - density of ocean water 1026 kg/m³
Cpo - heat capacity of ocean water 3996 J/kg/°K
(rho Cp)o - water density × heat capacity 4.1 × 106 J/m³/°K
Tf - freezing point of ocean water -1.8 °C
So - salinity of ocean water 34.7 ppt
rhoi - density of sea-ice 905 kg/m³
Cpi - heat capacity of sea-ice 2100 J/kg/°K
(rho Cp)i - ice density × heat capacity 1.9 × 106 J/m³/°K
Tm - melting point of sea-ice 0°C = 273.16°K
Si - salinity of sea-ice 4 ppt
rhos - density of snow 330 kg/m³
Cps - heat capacity of snow 2090 J/kg/°K
(rho Cp)s - snow density × heat capacity 690000 J/m³/°K
g - gravitational acceleration 9.80616 m/s²
kappa - von Karman constant 0.40
sigma - Stefan-Boltzmann constant 5.67 × 10-8 W/m²/°K4
Omega - rotation rate of the earth 2pi/86164 rad/s
Cw - coefficient in ice-ocean stress 0.6524 kg/m²/s

Fri 07 Aug 1998, 12:00:00