[gradsusr] Is this the pressure gradient?

[Jeff Duda]

Looks correct to me.

Jeff


On Mon, Aug 25, 2014 at 5:20 PM, Djordje Romanic <djordje8 at gmail.com> wrote:

> Hi all,
>
> Last couple of days I am doing some pressure gradient calculations so I
> wanted to double check my methodology for calculating the pressure
> gradients in GrADS.
>
> This is how I am doing it:
>
> 'define dx = 6.371e3 * cos(lat * 3.14159/180) * cdiff(lon * 3.14159/180,
> x)'
> 'define dy = 6.371e3 * cdiff(lat * 3.14159/180, y)'
>
> 'define pg = mag(cdiff(slp,x)/dx, cdiff(slp, y)/dy)'
>
> Basically, I am defining dx and dy using cdiff function. Then, I find the
> magnitude of the pressure gradient using mag of cdiff of my mean sea level
> pressure over the above-mentioned dx and dy.
>
> My slp in NetCDF data is in Pascals and radius of the Earth is in km. so
> my pressure gradient units are Pa/km.
>
>
> If anyone has experience with the pressure gradient calculations in GrADS,
> please could you confirm if this methodology is good?
>
> Cheers,
> Djordje
>
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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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