Fast simulations of downward UV doses, indices and irradiances at the Earth's surface

Version 2.3, Copyright © 2005 NILU, Ola Engelsen
Norwegian Institute for Air Research

Press here for more information on FastRT and other model versions

Solar Geometry for Irradiance Calculations

Month Day GMT Hours Minutes Year

Latitude (degs N) Longitude (degs E)

When checked, use degrees for Solar Zenith Angle directly and ignore Date, Time, and Location

Cloudless sky: Visibility of km, Range [5-350] km. Ångström β of , Range [0.0-0.4] (AOD = βλµm-1.3).

Scattered clouds: Cloud fraction of %, Range [0-100]. Cloud liquid water column of g m-2, Range [0-5000].

Broken clouds (radiation enhancement): Cloud liquid water column of g m-2, Range [0-5000].

Overcast sky: Cloud liquid water path (LWP) of g m-2, Range [0-5000]. (Thin clouds: LWP < 50 g m-2; Thick clouds: LWP > 500 g m-2)

Total ozone column: Dobson Units (DU), Range [100-600]
Press here for total ozone column measurements from the satellite instruments (OMI).

Surface altitude km. Range [0.0-6.0] km

Surface albedo of Range [0.0-1.0].

Surface type:

Triangular spectral response function, Full Width Half Maximum (FWHM): nm, Range [0.05-55.0] nm, multiples of 0.05 nm

Compute surface downward irradiance for at wavelength nm, Range [290-400] nm.

Compute surface irradiances from to at steps of nm, Range [290-400nm].

Compute UV daily dose of type
      (Solar zenith angle and time of day selection ignored)

Compute UV doserate of type

Print UV action spectrum of type

This work has been funded by the European Commission (EC) and the Norwegian Research Council ( NFR) through the projects UV Radiation in the Arctic: Past, Present and Future (UVRAPPF) and European Database for UV Climatology and Evaluation (EDUCE).

Contact: (Arve Kylling or Tove Svendby)
NILU - Norwegian Institute for Air Research
Instituttveien 18
NO-2027 Kjeller