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

Usage

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

References

• 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.