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*>I want to calculate the Ekman pumping upwelling velocity so that
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*>involves the curl of wind stress. Does anyone know how the do
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*>curl using NCL function?
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The curl of a vector quantity:

[1] If your data are global and contain no missing values

(_FillValue), then the spherical harmonic functions should be used.

These are highly accurate:

http://ngwww.ucar.edu/ngdoc/ng/ref/ncl/NclFuncsAndProcs.html

Click: Spherical harmonics

Specifically, if your data are on a gaussian grid use: uv2vrG

regular : uv2vrF

[2] if the data are over a limited area or having missing

data then use "uv2vr_cfd"

http://ngwww.ucar.edu/ngdoc/ng/ref/ncl/functions/vrdvcfd.html

this uses finite differences.

[3] In either documentation for the above functions

u==>taux and v ==>tauy

w_Ekman = [curl x TAU] / (f*rho)

good luck

D

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