Calculation of extinction and scattering in the wavelength range 0.25 to 15 microns by hydrometeors and for general German weather situations

For system design and operational research purposes a computer program, KATTA, was written for the description of absorption and scattering of electromagnetic waves by hydrometeors (water droplets in rain, fog and clouds). The calculation is based upon the Mie theory and single scattering. It is valid for Mie parameters up to 10,000 and includes the angular dependency of the scattering function. The program is compatible with existing LOWTRAN codes. For application of the integrated KATTA + LOWTRAN-code to European scenario detailed European atmospheric input data were used. They contain statistical meteorological data and German significant weather map types including precipitation, fog and clouds. The results show the variation of calculated atmospheric transmission for the different weather situation with and without precipitation.