This RGB provides cloud top microphysics information, primarily from the reflected component of the IR3.9 µm channel. For guidance on calculating the IR3.9 µm reflectance component, see the CIRA algorithm (Kidder et al.): http://nwafiles.nwas.org/digest/papers/2000/Vol24No4/Pg25-Kidder.pdf.
For the green beam, use of the IR3.9 reflectance component is recommended due to its high sensitivity to cloud microphysics.
As an alternative, the NIR1.6µm channel can be used (see the Legacy RGB section).
The use of the NIR2.25 µm channel may also be explored as a potential option.
The blue component provides cloud top temperature information.
This RGB is complimentary to the Day Cloud Phase RGB, with each providing distinct but related insights into cloud properties.
