Calculates wet bulb temperature in K, given pressure in temperature in K and mixing ratio in kg/kg from WRF model output.
Available in version 6.2.0 and later.
function wrf_wetbulb ( p : numeric, t : numeric, qv : numeric ) return_val : float or double
Pressure in [mb]. The rightmost dimensions are bottom_top x south_north x west_east.t
Temperature in [K]. An array with the same dimensionality as p.qv
Water vapor mixing ratio in [kg/kg]. An array with the same dimensionality as p.
Wet bulb temperature in [K]. The rightmost three dimensions will be bottom_top x south_north x west_east, and the leftmost dimensions, if any, will be the same as p's. The array will contain the same named dimensions as p; otherwise, the rightmost two dimensions will be named "south_north" and "west_east". The type will be double if any of the input is double, and float otherwise.
This function returns wet bulb temperature in K, given pressure in temperature in K and mixing ratio in kg/kg from WRF model output.
You can use wrf_user_getvar with an argument of "tw" to calculate this diagnostic.
The return variable will contain two attributes:
return_val@description = "Wet Bulb Temperature"
return_val@units = "K"
Questions on this function should be sent to email@example.com.
See the full list of WRF functions.
Note: for WRF variable names and their definitions, you can easily check them by using "ncl_filedump":
filename = "wrfout_d01_2008-09-29_20:00:00.nc" a = addfile(filename,"r") t = wrf_user_getvar(a,"tk",0) p = wrf_user_getvar(a,"p",0) qv = wrf_user_getvar(a,"QVAPOR",0) twb = wrf_wetbulb(p,t,qv)
You can see some other example scripts and their resultant images at: