Use pre-calculated Mie tables; useful for correlated_k; the tables are expected in data_files_path/correlated_k/../.For spectral or pseudo-spectral (correlated_k sbdart) calculations, a set of pre-calculated tables is also available; the wavelength grid points of these data has been carefully selected such that the extinction cross section, single scattering albedo, and the asymmetry parameter are accurate to 1% (compared to the fully-resolved Mie calculation) for all wavelengths between 250nm and 100 micrometer. For spectral or pseudo-spectral calculations wc_properties_interpolate has to be defined explicitely to initiate the interpolation of the optical properties to the internal wavelength grid. Please note that this option may be extremely memory-consuming because for each internal wavelength a full set of Legendre moments of the phase function is stored (up to several thousands). The Mie tables are not part of the standard distribution (because of their large size) but they are freely available from http://www.libradtran.org. This is the correct option to calculate radiances, to be preferred over the Henyey-Greenstein approach of ().



Jonas Kylling 2010-03-06