[Wrf-users] pressure at surface lower than at level 1

[Eric Altshuler]

Are you sure you have calculated PTOT correctly? 


PTOT = P + PB 


where P is perturbation pressure and PB is base state pressure (on model levels). 


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: "CARLOS ROMÁN CASCÓN" <carlosromancascon at fis.ucm.es> 
To: wrf-users at ucar.edu 
Sent: Tuesday, December 11, 2012 2:13:56 PM 
Subject: [Wrf-users] pressure at surface lower than at level 1 

Hi, 

I have obtained the attached plot of PSFC (surface pressure, black line) 
and PTOT (total pressure at level 1, red line). 

As you can see, there are some times when the pressure at surface is 
lower than at level 1. 

I think this does not make sense... even when I am trying to study a 
possible gravity wave over the zone. 

Can anyone suggest me something? (why I see these oscillations in P at 
the surface but not in lev 1?) 

Thank you very much in advance. 

Regards 

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