<div dir="ltr">Dear users,<div><br></div><div style>I can understand how to calculate moisture convergence with specific humidity/mixing ratio but, I have relative humidity.</div><div style><br></div><div style>Could anybody please help me how to calculate moisture convergence with relative humidity?</div>
<div style><br></div><div style>Thank you in advance,</div><div style><br></div><div style>Sincerely,</div><div style><br></div><div style>Kishore</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, May 30, 2013 at 7:11 PM, Mohsen Soltani <span dir="ltr"><<a href="mailto:soltani.clima@gmail.com" target="_blank">soltani.clima@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:13px">Dear Davide,</span><br>
</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">
<span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:13px">It sounds logical! Thank you very much for your kindness.</span></div>
<span class="HOEnZb"><font color="#888888">
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif;font-size:13px"><br></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">
<span style="font-family:arial,sans-serif;font-size:13px">Mohsen</span></div></font></span></div><div class="gmail_extra"><div class="im"><br clear="all"><div><div dir="ltr"><span><span style="font-size:11.0pt;line-height:115%;font-family:"Calibri","sans-serif";color:#888888"></span></span><span><span dir="RTL" style="font-size:11.0pt;line-height:115%;font-family:"Arial","sans-serif";color:#888888" lang="AR-SA"><span></span></span></span>--<div>
some are weather-wise some are otherwise!</div><div>--<br>Best Wishes, <br>(Mr.) Mohsen Soltani<br>Climatology Grad Student (M.Sc.),<br>Faculty of Geography, University of Tehran, Tehran, Iran<br>
Tel: <a href="tel:%28%2B98%29%209119772934" value="+989119772934" target="_blank">(+98) 9119772934</a><br>e-mail: <a href="mailto:soltani.clima@gmail.com" target="_blank">soltani.clima@gmail.com</a><br></div></div></div>
<br><br></div><div><div class="h5"><div class="gmail_quote">On Thu, May 30, 2013 at 2:54 AM, Davide Sacchetti <span dir="ltr"><<a href="mailto:davide.sacchetti@arpal.gov.it" target="_blank">davide.sacchetti@arpal.gov.it</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">specific humidity is defined as ratio of water vapor mass (g) over air<br>
mass (kg) (units: g/kg)<br>
mixing ratio is almost the same: ratio of water vapor mass (g) over DRY<br>
air mass (kg) (units: g/kg)<br>
<br>
your divergence is like d(u*mixr)/dx, then has units of (m/s * g/kg)/m:<br>
units should be g/kg*s-1<br>
<br>
bye bye<br>
Davide<br>
<div><div><br>
On Thu, 2013-05-30 at 01:39 -0700, Mohsen Soltani wrote:<br>
> Dear GrADS Users,<br>
><br>
><br>
> I employed the following script to display the moisture convergence.<br>
> But, I don't know what is the unit of the output! Please see the<br>
> attached plot and let me know what's your opinion.<br>
><br>
><br>
> ************************************************************************<br>
> * rh = Relative Humidity in %<br>
> * t = Temp at *set level in degrees Kelvin<br>
> * tc = Temp in degrees C<br>
> * td = Dewpoint at *set level in degrees C<br>
> * e = Vapor pressure<br>
> * mixr = Mixing ratio<br>
> * u = U-wind in m/s<br>
> * v = V-wind in m/s<br>
> * mconv = moisture convergence/divergence.<br>
><br>
><br>
> 'tc = (t-273.16)'<br>
> 'td = tc-((14.55+0.114*tc)*(1-0.01*rh) + pow((2.5<br>
> +0.007*tc)*(1-0.01*rh),3) + (15.9+0.117*tc)*pow((1-0.01*rh),14))'<br>
> 'vapr = 6.112*exp((17.67*td)/(td+243.5))'<br>
> 'e = vapr*1.001+(lev-100)/900*0.0034'<br>
> 'mixr = 0.62197*(e/(lev-e))*1000'<br>
> 'mconv = (1)*hdivg(u*mixr,v*mixr)*1e4'<br>
> 'd mconv'<br>
> ********************************************************<br>
><br>
><br>
><br>
><br>
> Thank you,<br>
> Mohsen<br>
><br>
><br>
> --<br>
> some are weather-wise some are otherwise!<br>
> --<br>
> Best Wishes,<br>
> (Mr.) Mohsen Soltani<br>
> Climatology Grad Student (M.Sc.),<br>
> Faculty of Geography, University of Tehran, Tehran, Iran<br>
> Tel: <a href="tel:%28%2B98%29%209119772934" value="+989119772934" target="_blank">(+98) 9119772934</a><br>
> e-mail: <a href="mailto:soltani.clima@gmail.com" target="_blank">soltani.clima@gmail.com</a><br>
><br>
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--<br>
--> Attenzione cambio indirizzo: <a href="mailto:davide.sacchetti@arpal.gov.it" target="_blank">davide.sacchetti@arpal.gov.it</a><br>
--<br>
Davide Sacchetti<br>
Centro Funzionale Meteo Idrologico di Protezione Civile della Regione Liguria<br>
ARPAL Unità Tecnica Complessa di livello Regionale<br>
V.le Brigare Partigiane 2 16121 Genova (I)<br>
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mail: <a href="mailto:davide.sacchetti@arpal.gov.it" target="_blank">davide.sacchetti@arpal.gov.it</a> web: <a href="http://www.meteoliguria.it" target="_blank">www.meteoliguria.it</a><br>
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