[gradsusr] what is the unit of moisture convergence?

[Mohsen Soltani]

Dear Davide,

It sounds logical! Thank you very much for your kindness.

Mohsen

--
some are weather-wise some are otherwise!
--
Best Wishes,
(Mr.) Mohsen Soltani
Climatology Grad Student (M.Sc.),
Faculty of Geography, University of Tehran, Tehran, Iran
Tel: (+98) 9119772934
e-mail: soltani.clima at gmail.com


On Thu, May 30, 2013 at 2:54 AM, Davide Sacchetti <
davide.sacchetti at arpal.gov.it> wrote:

> specific humidity is defined as ratio of water vapor mass (g) over air
> mass (kg) (units: g/kg)
> mixing ratio is almost the same: ratio of water vapor mass (g) over DRY
> air mass (kg) (units: g/kg)
>
> your divergence is like d(u*mixr)/dx, then has units of (m/s * g/kg)/m:
> units should be g/kg*s-1
>
> bye bye
> Davide
>
> On Thu, 2013-05-30 at 01:39 -0700, Mohsen Soltani wrote:
> > Dear GrADS Users,
> >
> >
> > I employed the following script to display the moisture convergence.
> > But, I don't know what is the unit of the output! Please see the
> > attached plot and let me know what's your opinion.
> >
> >
> > ************************************************************************
> > * rh    = Relative Humidity in %
> > * t     = Temp at *set level in degrees Kelvin
> > * tc    = Temp in degrees C
> > * td    = Dewpoint at *set level in degrees C
> > * e     = Vapor pressure
> > * mixr  = Mixing ratio
> > * u     = U-wind in m/s
> > * v     = V-wind in m/s
> > * mconv = moisture convergence/divergence.
> >
> >
> > 'tc = (t-273.16)'
> > 'td = tc-((14.55+0.114*tc)*(1-0.01*rh) + pow((2.5
> > +0.007*tc)*(1-0.01*rh),3) + (15.9+0.117*tc)*pow((1-0.01*rh),14))'
> > 'vapr = 6.112*exp((17.67*td)/(td+243.5))'
> > 'e = vapr*1.001+(lev-100)/900*0.0034'
> > 'mixr = 0.62197*(e/(lev-e))*1000'
> > 'mconv = (1)*hdivg(u*mixr,v*mixr)*1e4'
> > 'd mconv'
> > ********************************************************
> >
> >
> >
> >
> > Thank you,
> > Mohsen
> >
> >
> > --
> > some are weather-wise some are otherwise!
> > --
> > Best Wishes,
> > (Mr.) Mohsen Soltani
> > Climatology Grad Student (M.Sc.),
> > Faculty of Geography, University of Tehran, Tehran, Iran
> > Tel: (+98) 9119772934
> > e-mail: soltani.clima at gmail.com
> >
> > _______________________________________________
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> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
>
> --
> --> Attenzione cambio indirizzo: davide.sacchetti at arpal.gov.it
> --
> Davide Sacchetti
> Centro Funzionale Meteo Idrologico di Protezione Civile della Regione
> Liguria
> ARPAL Unità Tecnica Complessa di livello Regionale
> V.le Brigare Partigiane 2 16121 Genova (I)
> tel: +39 010 6437535                    fax: +39 010 6437520
> mail: davide.sacchetti at arpal.gov.it     web: www.meteoliguria.it
>
>
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