<div dir="ltr"><div>Tabish:</div><div><br></div><div>On the staggered C-grid (assuming you are using ARW), P and PB are on the scalar points (n+1/2, see URL below). Thus, if you really wish to have P at the surface you will have to interpolate P+PB down to the surface. An easy way to obtain pressure at the surface is to extract the 'PSFC' 2-D array from the wrf.out file using ARWpost or using your own post processing program (the latter being preferred).</div><div><br></div><div><a href="http://marine.rutgers.edu/po/documentation/docs.php?doc=romsman&page=technique&a=vertical_grid" target="_blank">http://marine.rutgers.edu/po/documentation/docs.php?doc=romsman&page=technique&a=vertical_grid</a><br></div><div><br></div><div>Cheers and hope this helps,</div>-- <br><div>-------------------------------------------------------------<br>Alexandre Fierro, PhD<br>Research Scientist-<br>National Severe Storms Laboratory (NSSL/NOAA)<br><b style="font-weight:normal">The Cooperative Institute for Mesoscale Meteorological Studies</b> (OU/NOAA)<br>Los Alamos National Laboratory, Los Alamos, NM (LANL)<br><br>"Yesterday is History, Tomorrow is a Mystery and Today is a Gift; That is why it is called the Present" <br><br>"There are only 10 types of people in the world:<br>Those who understand binary, and those who don't" <br><br>"My opinions are my own and not representative of OU, NSSL,<br>AOML, HRD, LANL or any affiliates."<br> ^.^<br> (o o)<br> /( V )\<br> ---m---m----</div><div class="gmail_extra"><br><div class="gmail_quote">On 17 February 2015 at 22:00, Eric Altshuler <span dir="ltr"><<a href="mailto:ela@cola.iges.org" target="_blank">ela@cola.iges.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:#000000">Hi Tabish,<div><br></div><div>Yes, you are correct. Total pressure = P + PB.</div><div><br></div><div>Best regards,<br><br><div><span name="x"></span>Eric L. Altshuler<br>Research Scientist<br>Center for Ocean-Land-Atmosphere Studies<br>253 Research Hall, Mail Stop 6C5<div>George Mason University</div><div>4400 University Drive<br>Fairfax, VA 22030 USA<br><br>E-mail: <a href="mailto:ela@cola.iges.org" target="_blank">ela@cola.iges.org</a><br>Phone: <a href="tel:%28703%29%20993-5725" value="+17039935725" target="_blank">(703) 993-5725</a><br>Fax: <a href="tel:%28703%29%20993-5770" value="+17039935770" target="_blank">(703) 993-5770</a></div><span name="x"></span><br></div><br><hr><b>From: </b>"Tabish Ansari" <<a href="mailto:tabishumaransari@gmail.com" target="_blank">tabishumaransari@gmail.com</a>><br><b>To: </b><a href="mailto:wrf-users@ucar.edu" target="_blank">wrf-users@ucar.edu</a><br><b>Sent: </b>Monday, February 16, 2015 9:04:26 AM<br><b>Subject: </b>[Wrf-users] plot surface pressure in WRF<br><br><div dir="ltr"><div style="font-family:verdana,sans-serif;color:#45818e">Hi</div><div style="font-family:verdana,sans-serif;color:#45818e"><br></div><div style="font-family:verdana,sans-serif;color:#45818e">I want to plot pressure at various model levels (50 in my case). I notice that there are 2 variables related to pressure in WRF: P (perturbation pressure) and PB (base state pressure).</div><div style="font-family:verdana,sans-serif;color:#45818e"><br></div><div style="font-family:verdana,sans-serif;color:#45818e">Do I need to add both the variables to obtain the total pressure at a given vertical level?</div><div style="font-family:verdana,sans-serif;color:#45818e"><br></div><div style="font-family:verdana,sans-serif;color:#45818e">Thanks in advance</div><div style="font-family:verdana,sans-serif;color:#45818e"><br></div><div><div><div dir="ltr"><font face="trebuchet ms, sans-serif" color="#3d85c6">Tabish U Ansari</font><div><font face="trebuchet ms, sans-serif" color="#3d85c6">MS Research Scholar<br>Environmental & Water Resources Engineering Division</font></div><div><font face="trebuchet ms, sans-serif" color="#3d85c6">Department of Civil Engineering</font></div><div><font face="trebuchet ms, sans-serif" color="#3d85c6">IIT Madras</font></div></div></div></div>
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