These models are the result of a multiyear team effort to derive new ice cloud scattering models based on reanalysis of in-situ data from a variety of midlatitude and tropical ice cloud field experiments. Here are a few details about the models:
More complete descriptions of the in situ data are provided in the following links.
The percentage of each habit used in the integration of a given property over a particle size distribution is based on the particle's maximum dimension.
D < 60 microns:
60 microns < D < 1000 microns:
15% 3D bullet rosettes
50% solid columns
1000 microns < D < 2500 microns:
45% hollow columns
45% solid columns
2500 microns < D < 9500 microns
97% 3D bullet rosettes
VIRS Narrowband Models:
A tar file has been prepared for each of the five VIRS bands noted below. Each tar file contains a set of 18 models, with effective diameters (De) spanning a range from 10 to 180 microns in increments of 10 microns.
Naming convention of individual files: The band number and effective diameter is in the file name. For example, a file named VIRS_mix1_b02_d080.dat means this: habit mixture 1 as described above, VIRS band 2 (1.6 micron wavelength), and a De of 80 microns.
Note: Channels 3, 4, and 5 have been updated as of April 10, 2006. These new models incorporate a significant update in scattering libraries detailed in Yang et al. (2005), with the full reference below. These new models tend to have a higher asymmetry factor and a lower single scattering albedo than the previous models. The changes in the scattering phase function are minimal. There is no delta transmission energy in these new models, as this is primarily only important at shorter wavelengths. To make these new models distinguishable from the previous ones that we had available prior to 4/10/2006, the file naming convention has been changed so that prefix 'b' for band is now 'ch' for channel. Thus, a file named VIRS_mix1_ch03_d080.dat means this: habit mixture 1 as described above, VIRS channel 3 (3.75 micron wavelength), and a De of 80 microns.
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