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Chapter 4. Subgrid-scale orographic
drag
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
half mountain width in 
-direction
function of the mountain anisotropy
half mountain width in 
-direction
drag coefficient
drag due to flow in blocked layer
function of the mountain sharpness
maximum mountain height 
mountain height profile
non-dimensional mountain height (
)
critical non-dimensional mountain height
length scale of the grid-point region
horizontal width of mountain seen by the upstream
flow 
Brunt-Väisälä frequency
Brunt-Väisälä frequency of un-blocked
flow evaluated at height 
Richardson number
critical Richardson number
wind speed in 
-direction
wind speed of incident un-blocked flow evaluated
at height 
component of the wind speed in the direction of
component of wind speed in the direction of
the stress 
wind speed in 
-direction
depth of blocked layer
anisotropy of the orography (
)
orientation of the orography
standard deviation of orography
density of air at the surface
density of the un-blocked flow evaluated at
height 
slope of the orography
stress due to blocked flow
surface stress due to gravity waves
angle between incident flow and orographic
principal axisNext Section
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05.04.2002 |
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