[gradsusr] How to calculate the pressure gradient?

[Djordje Romanic]

Thanks,

Since I only need the pressure gradient, and not the pressure gradient
force, I should exclude 1/rho. Just one clarification. When I use cdiff
function for pressure (e.g. in LON direction), should I divide it with dx
or 2*dx. I believe that 2*dx would be correct.

Regards,
Djordje


On Wed, Aug 8, 2012 at 7:08 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:

> The pressure gradient is simply 1/rho * del(p), where del(p) is the
> gradient operator, which can be displayed in Grads using the mathematical
> decomposition of the gradient operator (i.e., derivatives in the x- and
> y-directions).  Use cdiff for those derivatives.  Note, you'll have to
> define your x- and y- grid spacing values as well.  See the examples on the cdiff
> help page <http://www.iges.org/grads/gadoc/gradfunccdiff.html> for how to
> do that.
>
> Jeff Duda
>
> On Wed, Aug 8, 2012 at 5:48 AM, Djordje Romanic <djordje8 at gmail.com>wrote:
>
>> Dear Users,
>>
>> I have to calculate the pressure gradient in a given area (Southeast
>> Europe) and I have a pressure date at 2.5 x 2.5 degrees (reanalysis data).
>> Does anyone know how to calculate it in GrADS and how to show the results
>> in the vector form?
>>
>> Thanks in advance.
>>
>> Regards,
>> Djordje Romanic
>> M.Sc. in Meteorology
>> Cell: +38164 254 3539
>> www.linkedin.com (Djordje Romanic profile)
>>
>>
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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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