[ncl-talk] Regarding the calculation of heights

[Prashanth Bhalachandran]

Dear NCL'ers,
As we know WRF's outputs are originally in Eta coordinates. I am trying to
understand the logic of how the height (z) is calculated in NCL's
wrfusergetvar function.

 z  = *wrf_user_getvar*
<https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_getvar.shtml>(a,
"z",time)        ; grid point height

I expect that the height at each eta level should change as a function
of x,y, and time.

Can someone tell me how the above function calculates this z? Is there
an hydrostatic assumption? In other words, is the z

just geopotential height? Or is it the actual height itself?

Thank you,

Prashanth
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