<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><style>p { margin: 0; }</style><div style="font-family: Arial; font-size: 12pt; color: #000000">Are you sure you have calculated PTOT correctly?</div><div style="font-family: Arial; font-size: 12pt; color: #000000"><br></div><div style="font-family: Arial; font-size: 12pt; color: #000000">PTOT = P + PB</div><div style="font-family: Arial; font-size: 12pt; color: #000000"><br></div><div style="font-family: Arial; font-size: 12pt; color: #000000">where P is perturbation pressure and PB is base state pressure (on model levels).</div><div style="font-family: Arial; font-size: 12pt; color: #000000"><br></div><div style="font-family: Arial; font-size: 12pt; color: #000000">Best regards,<span><br><br><span name="x"></span>Eric L. Altshuler<br>Assistant Research Scientist<br>Center for Ocean-Land-Atmosphere Studies<br>4041 Powder Mill Road, Suite 302<br>Calverton, MD 20705-3106<br>USA<br><br>E-mail: ela@cola.iges.org<br>Phone: (301) 902-1257<br>Fax: (301) 595-9793<span name="x"></span><br></span><br><hr id="zwchr"><b>From: </b>"CARLOS ROMÁN CASCÓN" <carlosromancascon@fis.ucm.es><br><b>To: </b>wrf-users@ucar.edu<br><b>Sent: </b>Tuesday, December 11, 2012 2:13:56 PM<br><b>Subject: </b>[Wrf-users] pressure at surface lower than at level 1<br><br>Hi,<br><br>I have obtained the attached plot of PSFC (surface pressure, black line)<br>and PTOT (total pressure at level 1, red line).<br><br>As you can see, there are some times when the pressure at surface is<br>lower than at level 1.<br><br>I think this does not make sense... even when I am trying to study a<br>possible gravity wave over the zone.<br><br>Can anyone suggest me something? (why I see these oscillations in P at<br>the surface but not in lev 1?)<br><br>Thank you very much in advance.<br><br>Regards<br><br>_______________________________________________<br>Wrf-users mailing list<br>Wrf-users@ucar.edu<br>http://mailman.ucar.edu/mailman/listinfo/wrf-users<br></div></div></body></html>