WRF registry options

[fog]

Hi,

Is there anywhere that I can find documentation for the options available in the WRF registry for setting up a new variable or package?

I'm aware of

https://www2.mmm.ucar.edu/wrf/users/tutorial/presentation_pdfs/202101/gill_registry.pdf

and

"associated scalars" in WRF registry

which are both helpful. However, there are still a number of options I don't fully understand. For example, if I want to create a new variable that represents a new hydrometeor species, I think I would need to add something like this:

state real my_variable ikjftb scalar 1 - irhusdf "MY_VAR" "Variable descriptions" "Variable units"

However, I don't fully understand the "ftb" and "usdf" tags, which I have copied over from other variables such as qnc. Also, are there any major differences between the "scalar" and "tracer" options? Is there any documentation that I could reference which would explain the meaning of all available tags and their uses?

Thanks!

 

[Ming Chen]

The "ftb" tag tells Registry that this variable is 4-dimensional. Its tendency and lateral forcing should be created.
The "usdf" tag is for nesting. if the variable is subject to nest interpolation or feedback, 'u', 'd', 'f' tell Registry that upward- and downward- and lateral-forcing should be created. 's' means smoothing between parent-child domain.
If the new variable you intend to add has similar features to some other variables defined in MOIST, I suppose it is safe to define this new variable following the same way as that for other variables.

 

[fog]

Thank you, that is very helpful.