[gradsusr] Second derivative

[Jeff Duda]

change your last line to
SECOND_DERIVATIVE = cdiff(dTX,x)/dx

Although, there is a problem with representing dx using cdiff(lon,x).
 Since the longitude change along a parallel is a function of longitude,
you need to account for that to get a truly accurate second derivative in
space.  This will be especially problematic near the poles.

Jeff Duda

On Mon, Oct 1, 2012 at 2:02 PM, one weather <oneweather at gmail.com> wrote:

> Hello!!
>
> I would like to draw the second derivative of the temperature. Is
> correct if I do this?
>
> >define dTX=cdiff(tmp2m,x)
> >define dx=cdiff(lon,x)
> >define SECOND_DERIVATIVE=(dTx/dx)/dx
>
> Thank you so much!!
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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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