wrfout output variable does not have ua, va, wa

[duanmu]

Hello administrator, I am calculating the average vertical velocity of azimuth Angle, but I find that wrfout output variables do not have wa (W-component of Wind on Mass Points), ua and va, only u, v, w and u10, etc. Attached is the namelist.input file. Use wrf4.4

 

[Ming Chen]

This is because WRF employs staggered grid structure and these variables are not located at mass points. You need to "unstagger" them and put them to mass points by post-processing.
If you are familiar with NCL, please see the website here, which provides NCL functions to un-stagger variables from wrfout files.
The python codes that process wrfout files can be found here.
Both NCLA and WRF-Python can be applied to remap wrfout data on the mass points.

 

[duanmu]

Thanks to the administrator's answer, I used ua = getvar(wrfin, "ua", units="kt"),