[gradsusr] Sfc level in ctl file

[Rowell, Mason D.]

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<mailto:jma at cola.iges.org>



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