MC-UNIK (Monte Carlo Modell)

Simulated device: pyranometer

Contact: Andreas Macke (macke@tropos.de)

Output parameter

Radiation flux densities [W m-2], radiances [W m-2 str-1]

Technical specification

Column or 3D? 3D
Operation on model time step? Yes
Required libraries none
Programming language Fortran90
If online, is it modular? no, separate code
Ground-based or space-borne? ground-based


Minimum set of physical quantities:

  • volume extinction coefficient [m-1]
  • single scattering albedo [no dimension]
  • particle effective radius [m]
  • distinction ice, water, rain, snow (All 3D)
  • Externally assumed: Shape of particle size distribution and shape of particles

Need for a special grid?

  • cartesian grid required, adaption to triangular grid difficult

Are parameters given via namelist or have to be coded?

  • no namelist, ASCII & binary input files

Are there special requirements to the input quantities?

  • complete grid required, no gaps

Documentation: no

Models for application: GESIMA

Suitable for MESSy?:

Format of input data: no specifications

Format of output data: ASCII

Computational costs: 1h for 1week, depending on size of 3d field


Macke, A, Mitchell, D, von Bremen, L (1999): Monte Carlo radiative transfer calculations for inhomogeneous mixed phase clouds. Physics and Chemistry of the Earth 24 (3), 237-241.

Cahalan, R-F, Oreopoulos, L, Marshak, A, ( incl. Macke A ) et al. (2005): The International Intercomparison of 3D Radiation Codes (I3RC): Bringing together the most advanced radiative transfer tools for cloudy atmospheres. Bull. Amer. Met. Soc. doi: 10.1175/BAMS-86-9-1275.

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