[gradsusr] Sfc level in ctl file

[Jeff Duda]

CINsfc should be the CIN of a surface based parcel using surface data, not
data interpolated to 1000 mb.

On Sun, Nov 13, 2011 at 3:22 PM, Rowell, Mason D.
<Mason.D.Rowell-1 at ou.edu>wrote:

>  Jennifer,
>
>  Okay I think we are on the same page. My question is that if I set levs
> to 0, and I say plotted CINsfc, it would be the actual sfc based CIN that
> is plotted, and not something adjusted to sea level? That is a quantity
> that varies quasi-horizontally across the height varying surface itself?
>
>  Mason
>  ------------------------------
> *From:* gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] on
> behalf of Jennifer Adams [jma at cola.iges.org]
> *Sent:* Sunday, November 13, 2011 11:48 AM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] Sfc level in ctl file
>
>  In the documentation,
> http://iges.org/grads/gadoc/descriptorfile.html#VARS , it says:
> "If *levs* is 0, the variable does not correspond to any vertical level.
> Surface variables (e.g. sea level pressure) have a *levs* value of 0."
> If you put a "1" in the levs column, it means the variable has a Z
> dimension size of 1 and the value corresponds to the first value in the
> ZDEF statement.
>
>  --Jennifer
>
>  On Nov 13, 2011, at 12:18 PM, Rowell, Mason D. wrote:
>
>  All,
>
> I was wondering if there were any users of the NARR data in grads that
> could explain something to me. Several of the variables in the ctl file are
> only at level 0, like this 'CINsfc          0 156,1,0 '
>
> I recognize that those with 29 in the first column are defined on all 29
> reanalysis levels, but level 0 means what? I just want to make sure that if
> I can set the level of the data to the sfc that it is a terrain following
> surface and not 1000 mb adjusted. Though it seems that 1000 is level 1, and
> thus level 0 is something special, like the actual surface that is not
> along any constant pressure sfc.
>
> Mason
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>
>  --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
>
>
>
>
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>


-- 
Jeff Duda
Grad student - PhD, Meteorology
University of Oklahoma School of Meteorology - Center for Analysis and
Prediction of Storms
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