Variable Definition (continued)
t time [s]
U wind velocity [ms-l]
U* shear velocity [m-s-1]
V volume [m3]
WS Wind speed [mss-1]
xi volume fraction of the i-th soil component [m3m-3]
z depth below soil surface [m]
z0 surface roughness length [m]
a soil tortuosity dimensionlesss]
I- psychrometric constant [kPaCK-1]
7r diabetic influence function dimensionlesss]
soil water potential [m]
X thermal conductivity of soil composite at node j
[W-m-1.OK-1]
v kinematic viscosity [m2.s-1]
Pa density of moist air [kg'm-3]
Ps dry bulk density of soil [kg'm-3]
Pv water vapor concentration [kgH20'ms3il]
Pvj,n water va or concentration at node j and time step n
[kgH20'msoil]
Pva water va or concentration of ambient air
[kgH20'mairl
Pvs water vapor concentration in the air at saturation
[kgH20-m-lr]
Pw density of water [kg-m-3]
9 dimensionless water content
viii