[gradsusr] Help Geopotencial 1000 mb

[Eric Altshuler]

Hello Angelo,

By default, ARWpost does not extrapolate to pressure levels below the earth's surface. Over most of southern South America, the 1000 mb surface is below ground and therefore it is imaginary. There is a setting in the ARWpost namelist that forces ARWpost to extrapolate to pressure surfaces below ground. Set extrapolate = .true. to get this behavior. Note that in areas of high mountains, the extrapolation to 1000 mb, far below the surface, may not be meaningful.

Best regards,

Eric L. Altshuler
Assistant Research Scientist
Center for Ocean-Land-Atmosphere Studies
4041 Powder Mill Road, Suite 302
Calverton, MD 20705-3106
USA

E-mail: ela at cola.iges.org
Phone: (301) 902-1257
Fax: (301) 595-9793

----- Original Message -----
From: "angelo pascualetti" <apascualetti at gmail.com>
To: gradsusr at gradsusr.org
Sent: Saturday, April 3, 2010 8:01:19 AM
Subject: [gradsusr] Help Geopotencial 1000 mb


Hello. 
I have a problem trying to plot the variable geopotential at 1000 mb from the wrf model. 
The steps are: 

set contour gxout 
set lev 1000 1000 
d geopt 

Here comes the problem, because the figure do not graphics data on the continent. 
You either geopotential data plotted below 0. 

Why is this happening? 
Sigma levels will be because I use? 

I have attached a screenshot of the FIG. 

HELP! 
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