<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Oh, sorry Seyed, I think I got confused myself. Perhaps that is not what you want. Try looking at your sigma levels spatially, vertically and horizontally (you should have that as a variable, staggered and unstaggered, in your model output), and perhaps that will help you understand?<br>
</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Mar 26, 2014 at 12:48 PM, Paula Doubrawa <span dir="ltr"><<a href="mailto:pdoubraw@indiana.edu" target="_blank">pdoubraw@indiana.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi, Seyed<br><br>I do understand what you mean. Sigma levels are terrain following coordinates so a sigma level will never be the same height or pressure along its sigma surface. You will need to interpolate the " dust " . Say you have a variable called dust at sigma levels, and a variable called heights, also at sigma levels. Let desired_height = 500. Then<br>
<br>dust_height_levels = wrf_user_intrp3d(dust,heights,"h",desired_height,0.0,False)<br><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Will give you dust at the desired level. You can use pressures instead of heights, in which case instead of desired_height you should specify some desired_pressure, say 500 mb.<br>
</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Mar 26, 2014 at 12:38 PM, Seyed Omid Nabavi <span dir="ltr"><<a href="mailto:omid.nabavy@gmail.com" target="_blank">omid.nabavy@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:garamond,serif;font-size:large">Dear Paula,</div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">
<br></div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">
First of all, thanks for your time.</div><div class="gmail_default" style="font-family:garamond,serif;font-size:large"><br></div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">I also use NCL to map data and I am sure this command will help in next steps of the study.</div>
<div class="gmail_default" style="font-family:garamond,serif;font-size:large">But at the moment, I want to produce dust maps in geopotential layers not vertical interpolation. As you know, we analyze atmospheric data more based on constant pressure layers. for example wind streams in 500 hPa. Since, I want to convert sigma layers to geopotential heights (in meters) and then depict dust particles in any single layers. </div>
<div class="gmail_default" style="font-family:garamond,serif;font-size:large">For instance: the concentration of dust particles in 850 hPa not in sigma layer 4,5, 15..... etc.</div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">
<br></div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">Thanks again,</div><table style="font-size:13px;font-family:arial,sans-serif" cellpadding="0"><tbody><tr>
<td style="width:572px"><br></td></tr></tbody></table></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Mar 26, 2014 at 5:11 PM, Paula Doubrawa <span dir="ltr"><<a href="mailto:pdoubraw@indiana.edu" target="_blank">pdoubraw@indiana.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi, Seyed<br><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">
You can use your geopotential heights at the sigma levels to interpolate your variables... I always do it with ncl, and it's very easy with the function<br>
<br>wrf_user_intrp3d (<a href="http://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_intrp3d.shtml" target="_blank">see here</a>)<br><br><br><br><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
<div><div>On Wed, Mar 26, 2014 at 11:43 AM, Seyed Omid Nabavi <span dir="ltr"><<a href="mailto:omid.nabavy@gmail.com" target="_blank">omid.nabavy@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><div class="gmail_default" style="font-family:garamond,serif;font-size:large">
Dear all, </div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">
I am trying to map forecasted dust storms in different geopotential heights , not sigma levels, from wrfout file. </div>
<div class="gmail_default" style="font-family:garamond,serif;font-size:large">I used formula hPa=PH+PHB/g to calculate this parameter, but as you absolutely know it returns geo-heights in sigma levels. While I am trying to replace sigma level by geo-heights and sort forecasted data based on it. </div>
<div class="gmail_default" style="font-family:garamond,serif;font-size:large">Maybe it is a commonplace command, but unfortunately I could not find it on the net,</div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">
Thanks in Advance,</div>-- <br><div dir="ltr"><p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">===========================================</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Seyed Omid Nabavi;</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">PhD student, University of Vienna,</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Faculty of Earth Sciences, Geography and Astronomy</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Department of Geography and Regional Research</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">UZA II Althanstrasse 14 A-1010 Vienna</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Uni. Email: <a href="mailto:a1276905@unet.univie.ac.at" target="_blank">a1276905@unet.univie.ac.at</a></span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">===========================================</span></p></div>
</div>
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<br></blockquote></div><span><font color="#888888"><br><br clear="all"><br>-- <br><div dir="ltr"><span style="font-family:tahoma,sans-serif"><b>Paula Doubrawa</b><br>PhD Student<br>Atmospheric Sciences Program<br>
Department of Geological Sciences<br>
Indiana University</span></div>
</font></span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">===========================================</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Seyed Omid Nabavi;</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">PhD student, University of Vienna,</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Faculty of Earth Sciences, Geography and Astronomy</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Department of Geography and Regional Research</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">UZA II Althanstrasse 14 A-1010 Vienna</span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">Uni. Email: <a href="mailto:a1276905@unet.univie.ac.at" target="_blank">a1276905@unet.univie.ac.at</a></span></p>
<p><span style="font-family:"Times New Roman","serif";color:#7f7f7f">===========================================</span></p></div>
</div>
</div></div></blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr"><span style="font-family:tahoma,sans-serif"><b>Paula Doubrawa</b><br>PhD Student<br>Atmospheric Sciences Program<br>Department of Geological Sciences<br>
Indiana University</span></div>
</div>
</div></div></blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr"><span style="font-family:tahoma,sans-serif"><b>Paula Doubrawa</b><br>PhD Student<br>Atmospheric Sciences Program<br>Department of Geological Sciences<br>
Indiana University</span></div>
</div>