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| variable name | description | units / range |
|---|---|---|
| ME, MENF | topography elevation | m (may be negative, if below sea-level) |
| MG | land fraction (“land-sea mask”) | 0.0 – 1.0 (no unit) |
| VF ('2V' in output files) | vegetation fraction per class (26 classes) | 0.0 – 1.0 (no unit) |
| VG | class number of dominant vegetation type of above classes | 1 – 26 (integer, no unit) |
| GA | glacier fraction ( same as VF(2) ) | 0.0 – 1.0 (no unit) |
| J1/J2 (ISBA) SAND/CLAY (CLASS) | percentage of sand/clay per layer J1/J2: 5 layers; SAND/CLAY : 1-n layers | 0.0 – 100.0 % |
| DPTH (CLASS) | depth to dedrock | m |
| LDPT (FLake) | lake depth | m |
| Z0 | (effective) total roughness length for momentum | m |
| ZP | ln(Z0) | no unit |
| ZTOP | orographic roughness length for momentum | m |
| ZVG2 | vegetation roughness length for momentum | m |
| SSS | subgrid orography SD (small scale) | m |
| LH | launching height | m |
| Y7,Y8,Y9 | subgrid topography gradient correlations | no unit |
Ancre Vegetation classes Vegetation classes
Table of
| Vegetation classes | |
| Vegetation classes |
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Vegetation Fractions
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The field is called 'VF' for Vegetation Fractions even though it also contains ocean, glaciers, and lakes. The following is a table of GEM input vegetation fractions
and corresponding roughness lengths. For CLASS the roughness length is the height of the vegetation divided by 10.
.
In the geophysical fields the variable is called 'VF' but in model output it is called '2V'.
Instead of having one field name for each surface (vegetation) fraction it was decided to use the same name, 'VF', but different levels to distinguish the different types. The fields themselves contain the fraction of the specific type.
| Arbitrary level # | Description | n | class | Z0 [m] |
|---|---|---|---|---|
| 1 | salt water, ocean | 0.001 | ||
| 2 | glacier | 0.0003 | ||
| 3 | inland lake | 0.001 | ||
| 4 | evergreen needle-leaf trees | 1.5 | ||
| 5 | evergreen broadleaf trees | 3.5 | ||
| 6 | deciduous needle-leaf trees | 1.0 | ||
| 7 | deciduous broadleaf trees | 2.0 | ||
| 8 | tropical broadleaf trees | 3.0 | ||
| 9 | drought deciduous trees | 0.8 | ||
| 10 | evergreen broadleaf shrubs | 0.05 | ||
| 11 | deciduous shrubs | 0.15 | ||
| 12 | thorn shrubs | 0.15 | ||
| 13 | short grass and forbs | 0.02 | ||
| 14 | long grass | 0.08 | ||
| 15 | crops | 0.08 | ||
| 16 | rice | 0.08 | ||
| 17 | sugar | 0.35 | ||
| 18 | maize | 0.25 | ||
| 19 | cotton | 0.1 | ||
| 20 | irrigated crops | 0.08 | ||
| 21 | urban | 1.35 | ||
| 22 | tundra | 0.01 | ||
| 23 | swamp | 0.05 | ||
| 24 | desert / bare soil | 0.05 | ||
| 25 | mixed wood forests | 1.5 | ||
| 26 | mixed shrubs | 0.05 |
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