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[GEMPAK #YKC-319899]: RH wrt ice

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  • Subject: [GEMPAK #YKC-319899]: RH wrt ice
  • Date: Thu, 25 Jan 2007 13:45:48 -0700
> Hi Steve,
> 
> However you think it best. I was thinking that one could simply set 
> gfunc=reli and it would work.
> Thanks,
> Dave

Dave,

OK. I put in a GFUNC=RELI(tmpc,dwpc) function using Goff-Gratch (WMO No-49, 
2000) into the
5.10.1 release. I tested for consistency versus values produced at:
http://hurri.kean.edu/~yoh/calculations/satvap/satvap.html

Steve

Steve Chiswell
Unidata User Support 


> 
> ----- Original Message -----
> From: Unidata GEMPAK Support <address@hidden>
> Date: Tuesday, January 23, 2007 5:46 pm
> Subject: [GEMPAK #YKC-319899]: RH wrt ice
> 
> > That would be creating a function in the $GEMPAK/source/gemlib/df
> > directory(called by the dg/dgdriv.c routine).
> >
> > Steve
> >
> >
> >
> > > <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
> > > <html>
> > > <head>
> > > <meta content="text/html;charset=UTF-8" http-equiv="Content-Type">
> > > </head>
> > > <body bgcolor="#ffffff" text="#000000">
> > > Hi Steve,<br>
> > > What is a gemlib/df project?<br>
> > > Dave<br>
> > > <br>
> > > Unidata GEMPAK Support wrote:
> > > <blockquote cite="address@hidden"
> > type="cite">> <blockquote type="cite">
> > > <pre wrap="">Hello,
> > >
> > > Not sure if this is the right place for this request, but I think
> > the addition of a relative humidity with respect to ice function in
> > gfunc would be welcomed by the GEMPAK community.  I know I would
> > find it useful.
> > >
> > > Dave
> > >
> > >
> > > </pre>
> > > </blockquote>
> > > <pre wrap=""><!---->
> > >
> > > Dave,
> > >
> > > There are a number of formulations of Goff-Gratch. The WMO2000
> > version would seem to be the best
> > > starting point unless you are researching more recent work. The
> > es(i) saturation vapor pressure
> > > with respect to ice is straight forward from temperature:
> > > ; WMO formulation, which is very similar to Goff Gratch
> > > ; Source : WMO technical regulations, WMO-NO 49, Vol I, General
> > Meteorological Standards and Recommended Practices, Aug 2000, App. A.
> > >
> > > T0    = 273.16       ; steam point temperature in K
> > >
> > > Psat = 10.^(-9.09685 * (T0 / T - 1.) - 3.56654 * ALOG10(T0 / T) $
> > > + 0.87682 * (1. - T / T0) + 0.78614)
> > >
> > > I can put it on the list unless you are interested in a gemlib/df
> > project.>
> > > Steve Chiswell
> > > Unidata User Support
> > >
> > > Ticket Details
> > > ===================
> > > Ticket ID: YKC-319899
> > > Department: Support GEMPAK
> > > Priority: Normal
> > > Status: Closed
> > >
> > > </pre>
> > > </blockquote>
> > > </body>
> > > </html>
> > >
> > >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: YKC-319899
> > Department: Support GEMPAK
> > Priority: Normal
> > Status: Closed
> >
> >
> 
> 


Ticket Details
===================
Ticket ID: YKC-319899
Department: Support GEMPAK
Priority: Normal
Status: Closed