[gradsusr] Moisture flux convergence/divergence

[Frank Colby]

Hyacinth,

Can't you just use centered differences to compute the divergence of the
moisture fluxes you have computed?

That is, cdiff(zon,x) and cdiff(mer,y), correcting for the earth's
curvature as needed? (see the Grads Documentation Index for that part).

But maybe I'm missing something...
Frank

On 9/16/2011 3:09 PM, Hyacinth Nnamchi wrote:
> Jeff,
>
> I seems my question wasn't well framed, and so you dealt with the
> typo. I have attached two Figs showing what the calculations below
> will give and what exactly I'll like to do.
>
> Thanks,
>
> Hyacinth
>
>
> > Date: Thu, 15 Sep 2011 17:34:50 -0500>
> From: Jeffrey Duda <jdduda at iastate.edu>>
> Subject: Re: [gradsusr] Moisture flux convergence/divergence
> > To: GrADS Users Forum <gradsusr at gradsusr.org>
> > Message-ID:
> > <CAP9LQ-VNkxcu-+ey_QkZU7f4MHf+VwJDvav=Dci3ns+x+pjG8Q at mail.gmail.com>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Set the graphics output to vector ('set gxout vector'), then 'd zon;mer'
> > (note the semicolon instead of a comma).
> >
> > Jeff Duda
> >
> > 2011/9/15 Hyacinth Nnamchi <hyacinth.1 at hotmail.com>
> >
> > > Hello,
> > >
> > > This is not directly about GrADS but since most of address similar!
> > > problems, I guess someone on this forum will be able to answer my
> question.
> > >
> > > I understand that to calculate moisture transport, given zonal,
> meridional
> > > winds and specific humidity, can simply do:
> > >
> > > 'define zon=uwnd.1*shum.3'
> > > 'define mer=vwnd.2*shum.3'
> > > 'd zon,mer'
> > >
> > > But, I want to plot vectors indicating field of net moisture flux
> (all arrows converging/diverging) instead of just transport.
> > >
> > > Thanks for any ideas.
> > >
> > > Hyacinth
> > >
> > >
> > > __
>
>
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