====== Output Files: Surface/Flux data (_FX_) ======
<fs smaller>[[filereference:output:start|← go back to Output File Index]], **See also:** ()
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^ Dimension ^ Nr Variables ^ Format ^
| 2D | 37 | Binary (EDX/EDT) |
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**Surface/ Flux Data** 

Contains the state of the soil surface as an interface between the atmosphere and the soil model. It contains both the state of the surface (e.g. temperature) as well as turbulent fluxes into the air and molecular fluxes into the soil. 
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The surface data files are produced each main output interval (default: 60 min) and represent the general state of the surface at the given model time. 

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==== Variable list ====

<fs x-small>This list represents the general variable structure. The actual sequence of the variables might differ but the same information is stored in total.</fs>


|  |**Variable** |**Unit** |**Description** |
|  |Index Surface Grid| - | k grid index in which the surface is located (=0 if no DEM is used) |
|  |Soil Profile Type| - | Integer Index to the soil profile type used. An additional .SLDX file is generated to be used with LEONARDO to visiualise this information|
|  |z Topo| m | Terrain height (relative to reference level)|
|  |Surface inclination| ° | Inclination of surface if a DEM is used|
|  |Surface exposition| ° | Surface exposition (azimuth) if a DEM is used|
|  |Shadow Flag| - | =1 if surface is shaded (max 2% of direct radiation), 0 otherwise|
|  |T Surface | °C | Absolute surface temperature |
|  |T Surface Diff.| K | Difference surface temperature to reference surface |
|  |T Surface Change | K/h | Heating/Cooling rate of surface|
|  |q Surface| g/kg | Spec. Humidity of surface air layer (=air humidity if surface is sealed)|
|  |uv above Surface| m/s | Horizontal wind speed in layer directly above the surface|
|  |Sensible heat flux| W/m² | Sensible Heat Flux H (positive if from surface towards air)|
|  |Exchange Coeff. Heat| m²/s | Turbulent surface exchange coefficient for heat |
|  |Latent heat flux| W/m²| Latent Heat Flux LE (positive if from surface towards air, 0 for sealed surfaces)|
|  |Soil heat Flux | W/m²| Soil Heat Flux G (positve if directed towards the next soil layer)|
|  |Q_Sw Direct| W/m²| Sum of shortwave radiation max available|
|  |Q_Sw Direct Horizontal| W/m²| Direct shortwave radition received on a horizontal surface|
|  |Q_Sw Diffuse Horizontal| W/m²| Diffuse shortwave radition received on a horizontal surface|
|  |Q_Sw Reflected Received Horizontal| W/m²| Reflected shortwave radition received on a horizontal surface |
|  |Lambert Factor| - | Relative insolation for the actual surface expostion and solar angle|
|  |Q_Lw emitted| W/m²| Longwave radiation emitted from surface|
|  |Q_Lw budget| W/m²| Energy balance of surface in longwave spectrum|
|  |Q_Lw Sum all Fluxes| W/m² | Sum of all incomming longwave radiation|
|  |Water Flux| g/m² | Water flux from the surface to the air|
|  |Sky-View-Faktor| - | Sky View Factor |
|  |Building Height| m | Building height if a building is on the grid (for display of maps)|
|  |Surface Albedo| - | Surface albedo|
|  |Deposition Speed| mm/s | Deposition speed for selected particulate matter|
|  |Mass Deposed| µg/m² | Mass of particulate matter deposed over time|
|  |z node Biomet| - | Ref node index for 1.8 m level|
|  |z Biomet| m | Actual height of ref node in this model |
|  |T Air Biomet| °C | Air temperature at ref node|
|  |q Air Biomet| g/kg | Air humidity at ref node|
|  |TMRT Biomet| °C | TMRT at ref node|
|  |Wind Speed Biomet| m/s | Wind speed at ref node|
|  |Mass Biomet| ug/m³ | Particulate matter at ref node|
|  |Receptors| - | Flag for receptors|



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