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[GEMPAK #YKC-319899]: RH wrt ice

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  • Subject: [GEMPAK #YKC-319899]: RH wrt ice
  • Date: Tue, 23 Jan 2007 15:46:18 -0700
That would be creating a function in the $GEMPAK/source/gemlib/df directory
(called by the dg/dgdriv.c routine).

Steve



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