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Subject: Re: REANAL2 Specific Humidity
To: joseph@ucar.edu (Dennis Joseph)
Date: Tue, 6 Mar 2001 12:02:44 -0500 (EST)
In-Reply-To: <3AA5118B.EFF78B73@ucar.edu> from "Dennis Joseph" at Mar 06, 2001 09:34:19 AM
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> 
> Wesley,
> 
> One of our users reported constant fields of zero for specific humidity
> on the highest few sigma levels.  Is the same problem as the
> Reanalysis 1, with lack of precision resulting in poor representation
> in the high levels?
> 
> Thanks.
> 
> Dennis
> 
Dennis,

     Yes, you are right.  The code writes the SPFH to the 
nearest 0.1 gm/kg which is zero for the upper levels.
AFAIK the sigma->sigma-grib converter was unchanged from
R1 to R2.  (sigma->sigma-grib, sigma->isentropic and
sigma->pgb programs are now portable and "cheap" to run.
Users who want more precision or levels should run the
programs themselves.)

       Wesley