The GOES-R notional baseline includes an Advanced Baseline Imager (ABI), a Hyperspectral Environmental Suite (HES), a lightning mapper, and advanced space and solar observing instruments. The ABI is a state of the art, 16-channel imager covering 6 visible to near-IR bands (0.47, 0.64, 0.86, 1.38, 1.61, and 2.26 microns), and 10 infrared (IR) bands (3.90 to 13.3 microns). Spatial resolutions are band dependent: 0.5 km at nadir for broadband visible, 1.0 km for near IR and 2.0 km for IR. The ABI will scan the Full Disk (FD) in approximately 5 minutes.
Characteristics of the imager's spectral response functions were used to derive these ice bulk scattering files. The spectral response functions are named for a "Gaussian Boxcar Hybrid" function. They are created using code from Mike Griffin at MIT Lincoln Labs. The curve is gaussian, forced to go through the 50% points (lower and upper wavelengths) and the top of the curve is flattened out like a boxcar function, hence the name. The notation 'v1' stands for version 1 (note that the current version of that algorithm on February 18, 2004 is the same as that of October 15, 2003). Channel numbers are not officially stated in the PoRD, but CIMSS has assumed a numbering convention for ease of use in software - the bands are numbered by increasing central wavelength (same convention has used on the current GOES series of imagers, but opposite as the current sounder). The SRFs are available by ftp at this site.
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:
- Size distributions are based on 45 size bins (particle size ranges from 2 to 9500 microns).
- Ice particle habit distributions vary as a function of maximum dimension.
- New ice crystal scattering property libraries have been calculated for a variety of habits, including plates, hollow and solid columns, 3-D bullet rosettes, and aggregates.
- Each model contains the mean and standard deviation of each microphysical and optical property, including ice water content, mean mass diameter, single scatter albedo, asymmetry factor, fraction of delta transmitted energy, extinction efficiency, and the scattering phase function.
In situ Microphysical Ice Cloud Data
More complete descriptions of the in situ data are provided in the following links.
Ice crystal habit "recipe" implemented for these models
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.