[gradsusr] Grads vertical derivative error with cdiff

[Andre Pattantyus]

you need to use geopotential on pressure surface you will never get an
answer with z coordinate.  This is a basic units concept people!

-Andre

On Mon, May 7, 2012 at 6:25 PM, Arlindo da Silva <dasilva at alum.mit.edu>wrote:

>
>
> On Sun, May 6, 2012 at 9:44 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:
>
>> You can't use cdiff in the vertical.  You must calculate the derivative
>> using a manual centered difference.  For example, 'd
>> 0.5*(geopot(z+1)-geopot(z-1))'
>>
>>
> If you are using opengrads, there are functions designed for computing
> vertical advection, see
>
>     ADVECTION FUNCTIONS<http://opengrads.org/doc/udxt/libbjt/libbjt.html#advection_functions>
>
>
>   Arlindo
>
>
> --
> Arlindo da Silva
> *dasilva at alum.mit.edu*
>
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>


-- 
Andre Pattantyus, Graduate Student Research Assistant
Marine and Environmental Systems, Florida Institute of Technology
150 W. University Blvd, Melbourne, FL 32901

Phone: (321) 674-8330 | Fax: (321) 674-7212 | Email: apattantyus2008 at fit.edu
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