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Chapter 3. Turbulent diffusion and
interactions with the surface
IFS documentation Front Page
Chapter 1. Overview
Chapter 2. Radiation
Chapter 3. Turbulent diffusion and interactions with the surface
Chapter 4. Subgrid-scale orographic drag
Chapter 5. Convection
Chapter 6. Clouds and large-scale precipitation
Chapter 7. Land suface parametrization
Chapter 8. Methane oxidation
Chapter 9. Climatological data
REFERENCES
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APPENDIX A List of symbols
transfer coefficient for heat
transfer coefficient for momentum (drag
coefficient)
transfer coefficient for moisture
specific heat at constant pressure of
moist air
specific heat at constant pressure of
dry air
specific heat at constant pressure of
water vapour
kinetic energy lost by the diffusion
process
Coriolis parameter
horizontal wind speed at blending height
(for pp of 10 m wind)
horizontal wind speed at 10 m level
(for pp)
acceleration of gravity
diagnosed boundary layer height
blending height (for pp of 10 m wind)
vertical turbulent flux of 
surface humidity flux
surface flux of dry static energy
surface momentum flux
turbulent exchange coefficient for 
turbulent exchange coefficient for heat
turbulent exchange coefficient for momentum
turbulent exchange coefficient for moisture
Obukhov length
latent heat of vaporization/sublimation
mixing length for heat
mixing length for momentum
number of tiles
pressure
Prandtl number
specific humidity
virtual temperature flux in the surface
layer
saturation specific humidity
gas constant for dry air
gas constant for water vapour
net long wave radiation at the surface
net short wave radiation at the surface
relative humidity at the surface
local Richardson number
bulk Richardson number for the surface layer
dry static energy
virtual dry static energy
temperature
time
horizontal wind speed
, 
horizontal wind components
friction velocity 
free convection velocity scale
turbulent velocity scale 
roughness length for momentum (aerodynamic
roughness length)
roughness length for heat 
roughness length for moisture 
scale height of the boundary layer 
height of the lowest model level 
roughness length for momentum at SYNOP
station 
roughness length for heat at SYNOP station
roughness length for moisture at SYNOP
station 
height of sreen level observation (2
m) 
height of surface wind observation (10
m) 
implicitness factor for diffusion equation
Charnock parameter
scaling parameter for asymptotic mixing
length
time step
vertical grid length
virtual potential temperature
Von Kármán's constant
asymptotic mixing length
conductivity of 
kinematic viscosity 
density
standard deviation of horizontal wind
geopotential
universal gradient stability function
for wind
universal gradient stability function for temperature
universal gradient stability function
for moisture 
symbolic reference to a conservative
quantity
universal profile stability function
for wind
universal profile stability function
for temperature
universal profile stability function
for moistureSubscripts:
tile index
level index (counted from model top
downwards)
referring to lowest model level
referring to the skin layer
referring to the surfaceSuperscrips:
index for old time level, indicating
beginning of time step 
index for new time level, indicating
end of time step 
index referring to the latest full radiation
time step Special symbols:
implicit variable 
defined by equation (3.44) Next Section
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05.04.2002 |
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