A way to specify ice cloud optical depth, single scattering albedo,
and phase function moments for each layer.
ic_files file
The file specified by
ic_files has two columns where column 1 is the altitude in km. The second
column is the name of a file which defines the optical properties of the level
starting at the given altitude. The files specified in the second column must
have the following format:
- Column 1:
-
The wavelength in nm. These wavelengths may be different from those in solar_file.
Optical properties are interpolated to the requested wavelengths.
- Column 2:
-
The extinction coefficient of the layer in units km-1.
- Column 3:
-
The single scattering albedo of the layer.
- Column 4-(nmom+4):
-
The moments of the scattering phase function.
Note that for rte_solver disort2 it makes good sense to make the
number of moments larger than nstr because all moments are used
in the calculation. For rte_solver disort and
rte_solver polradtran the number of moments included in the calculations
will be nstr+1. Higher order moments will be ignored for these solvers.
Please note that the uppermost line of the ic_files denotes
simply the top altitude of the uppermost layer. The optical properties
of this line are consequently ignored. There are two options for this
line: either an optical property file with zero optical thickness is
specified or "NULL" instead.
Arve Kylling
2010-03-10