[ncl-talk] Problem with calculate average wind speed at specific z level(eta level)

[소윤영]

Dear NCL users,

I want to draw a 'ventilation index' calculated with pblh(m), wind speed, z
level.

-------------------------------------------------------------------------------------------
pblh=wrf_user_getvar(input_fils,"PBLH",-1)   ;PBL HEIGHT [m]

uvm10 =wrf_user_getvar(input_fils,"uvmet10",-1)    ; 10m U and V components
u10 = uvm10(0,:,:,:)
v10 = uvm10(1,:,:,:)
ws = sqrt(u10^2+v10^2)

pblws:= pblh*ws         ; 3d[t,y,x]
----------------------------------------------------------------------------------------------

this is the simple version of this idea. But i wnat to get a  average
windspeed at  0~z level which means 0~pblh(m).

I will be grateful for help
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