@@ -42,25 +42,32 @@ A full description of these files can be found in [Configuration](configuration.
Necessary fields from Eularian models:
- 3D wind velocities
- Temperatures
- Specific humidity
- Surface and sea level pressure
- Snow depth
- Cloud cover
- Cloud liquid and ice water content (when available)
- 2 metre dew point
- Large scale precipitation
- Convective precipitation
- Sensible heat flux
- Solar radiation
- Ew and ns surface stress
- Orography and its standard deviation
- Land sea mask
#### ECMWF
#### GFS
| Input field | Description | Unit|
| ------------- | ----------- | --------- |
**3D fields**
|horizontal velocities | grid scale velocities used for, e.g., particle propagation | m/s |
|vertical velocity |Vertical velocities on model levels used for, e.g., particle propagation. | etadot (IFS), m/s (GFS)|
|Temperature |Air temperature used for parameterisation schemes. | K |
|Specific (IFS) or relative (GFS) humidity |Internal use of specific humidity for parameterisation schemes. | kg/kg (IFS), \% (GFS) |
**2D fields**
|Surface pressure |Pressure at the ground level. | Pa |
|Snow depth |Thickness of snow layer necessary for dry deposition calculation. | m |
|Cloud cover |Fraction of the grid cell that is covered by cloud, used for wet deposition calculations. | 0-1 |
|10 meter horizontal velocities |Used to compute surface stress if not available. | m/s |
|2 meter temperature |Used for parameterisation. | K |
|2 meter dew point (ECMWF only) |Used for parameterisation, for GFS, this is computed according to \cite{bolton1980}. | K |
|Large scale precipitation |Used in the wet deposition scheme. | mm/h |
|Convective precipitation |Used in the wet deposition scheme. | mm/h |
|Sensible heat flux (ECMWF only) | Used to compute Obukhov length, for GFS this is computed using the profile method \citep{berkowicz1982}. | J m^2 |
|Solar radiation (ECMWF only) |Used to calculate the surface resistance for gases, for GFS solar radiation is assumed to be zero | J m^2 |
E-ward N-ward turbulent surface stress (ECMWF only) |Surface stress used for dry deposition computations. For GFS data, surface stress is calculated using [Berkowicz 1982](https://doi.org/10.1016/0004-6981(82)90032-4) | N m^2 s |
|Orography |Altitude of topography above sea level | m |
|Standard deviation of orography |Included into mixing layer height to account for subgrid scale variability | m |
|Land sea mask |Invoking surface stress computation including wind speeds over sea | 0-1 |
|Cloud liquid water content |Used by the wet scavenging scheme | kg/kg |
|Cloud ice water content |Used by the wet scavenging scheme | kg/kg |
