>I want to calculate the Ekman pumping upwelling velocity so that
>involves the curl of wind stress. Does anyone know how the do
>curl using NCL function?
The curl of a vector quantity:
 If your data are global and contain no missing values
(_FillValue), then the spherical harmonic functions should be used.
These are highly accurate:
Click: Spherical harmonics
Specifically, if your data are on a gaussian grid use: uv2vrG
regular : uv2vrF
 if the data are over a limited area or having missing
data then use "uv2vr_cfd"
this uses finite differences.
 In either documentation for the above functions
u==>taux and v ==>tauy
w_Ekman = [curl x TAU] / (f*rho)
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