[RegCNET] Question about ICBCs

[Guangyu Wu]

Hi Dr. Bi,

Thanks for your quick response.

I checked the ICBC.f code, the function for converting
RH (relative humidity) to Q is HUMID2FV, which uses
formula: Q=Q*Qs ( Qs=0.622*SATVP/(P-SATVP) )to convert
RH to Q. So I guess here the result Q is mixing ratio,
right? I saw someone are using the same equation to
convert RH to MR on the Internet.

I am not quite familiar with climate variables. I
searched over the Internet and found that the
relationship between SH and MR is SH = MR /(MR+1), so
there are little difference between the two. I am
looking forward to your comments.

Best regards and happy new year!

Guangyu Wu



--- XUNQIANG BI <bixq at ictp.it> wrote:

> 
> I think the output after PostProc is also specific
> humidity.
> 
> On Thu, 22 Feb 2007, Guangyu Wu wrote:
> 
> > Dear all,
> >
> > While checking the generated ICBC files, I found
> that
> > the Q is the specific humidity (SH) in the ICBC
> > description file. But after postprocessing, the QD
> > variable is indicated as mixing ratio (QD). Does
> the
> > postproc convert SH to QD, or just use the same
> > variable for different names? In RegCM main model,
> > which variable is used? Because there are some
> > differences between the two variables in reality,
> I am
> > wondering if someone can help me figure out this
> > problem. Thanks in advance!
> >
> > Guangyu Wu
> >
> >
> >
> >
>
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> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    Dr. Xunqiang Bi         email:bixq at ictp.it
>    Earth System Physics Group
>    The Abdus Salam ICTP
>    Strada Costiera, 11
>    P.O. BOX 586, 34100 Trieste, ITALY
>    Tel: +39-040-2240302  Fax: +39-040-2240449
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 



 
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