Solar Zenith Angle (degrees)
Solar Azimuth Angle (degrees)
Snow Depth (m)
Soil Surface Temperature (K)
At a minimum, FASST requires that the user provide the observed air temperature along
with the time and date. The data frequency may range from 1 minute to 24 hours, with
the optimum range being 13 hours. If any of the above parameters are not provided, the
following assumptions are made.
Air Pressure
1000 mbar
Relative Humidity
60%
Wind Speed
1.2 m/s
Wind Direction
0.0 degrees
Precipitation Rate
0.0 mm/hr
Precipitation Type
1 (none)
Low Cloud Amount
0.5 tenths
Low Cloud Height
1.5 km
Low Cloud Type
6 (stratus nebulosus or stratus fractus)
Middle Cloud Amount
0.0 tenths
Middle Cloud Height
4.0 km
Middle Cloud Type
3 altocumulus translucidus, 1 level
High Cloud Amount
0.0 tenths
High Cloud Height
8.0 km
5 (cirrus and/or cirrostratus < 45 above the horizon)
High Cloud Type
if High Cloud Amount < 0.4
7 (cirrostratus, full cover) if High Cloud Amount > 0.4
Total Incoming Solar Radiation (Direct + Diffuse)
Model will calculate
Direct Solar Radiation
Model will calculate
Diffuse Solar Radiation
Model will calculate
Upwelling Solar Radiation
Model will calculate
Net Solar Radiation (Total Upwelling)
Model will calculate
Incoming Infrared Radiation
Model will calculate
Emitted Infrared Radiation
Model will calculate
Net Infrared Radiation
Model will calculate
Solar Zenith Angle
Model will calculate
Solar Azimuth Angle
Model will calculate
Snow Depth
Model will calculate
Soil Surface Temperature
Model will calculate
The enumerations used for the precipitation and cloud types are based on SEDRIS.
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