<div dir="ltr">Zhifeng:<div><br></div><div>I just read your ncl question related to the calculation of the 500 hPa geopotential height in MPAS. Just wanted to let you know that the vertical discretization uses a height coordinate and not sigma (see Klemp (2011) for details on the terrain-following coordinate system used in MPAS).</div><div><br></div><div>To calculate the 500 hPa geopotential height, you need to use the "height" variable zgrid that is written in the init condition file by default if you have not saved it in a history file. You also need the "pressure" variable which you need to save in your history file. Once you have those 2 fields from your outputs, you can use any of the ncl functions int2p, int2p_n, or int2p_n_Wrap to interpolate you data to the 500 hPa level.</div><div><br></div><div>Note that MPAS also calculates the geopotential height at several fixed pressure levels too (see the User's guide on how to use the "diagnostics" stream so that you do not have to do that separately.</div><div><br></div><div><br></div><div>Hope this helps,</div><div>Laura</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Oct 23, 2018 at 3:13 PM Zhifeng Yang <<a href="mailto:yangzf01@gmail.com">yangzf01@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr">Hi Adam and Barry,<div><br></div><div>Sorry for less information. The vertical grid in MPAS is sigma. The horizontal grid is Voronoi mesh, unstructured grid. I saw there is a section in NCL processing MPAS model data. I thought MPAS is very common while using NCL. Here I attached the output from ncdump and printVarSummary. There are three types of model output files. diagnos, history, and restart. I am planning to use history output to calculate the geopotential height.</div><div><br></div><div>I took a look of several wrf related functions in NCL, e.g. wrf_interp_3d_z, wrf_interp_2d_xy. However, they are for latitude-longitude grids, like WRF.</div><div><br></div><div>Zhifeng</div><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Oct 22, 2018 at 11:02 PM Barry Lynn <<a href="mailto:barry.h.lynn@gmail.com" target="_blank">barry.h.lynn@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Just curious -- have your tried the WRF functions?</div><br><div class="gmail_quote"><div dir="ltr">On Mon, Oct 22, 2018 at 11:53 PM Adam Phillips <<a href="mailto:asphilli@ucar.edu" target="_blank">asphilli@ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Zhifeng,<div>I think more information is needed about your data to answer the question. Is your data on hybrid-sigma levels, or some other vertical coordinate? Is your data on an unstructured grid, or some other type? A printVarSummary of your data would also be helpful.</div><div>Adam </div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Oct 22, 2018 at 1:40 PM Zhifeng Yang <<a href="mailto:yangzf01@gmail.com" target="_blank">yangzf01@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi all,<div><br></div><div>I want to get the geopotential height at 500 mb from MPAS model output. Do we have NCL function to calculate it, or other possible methods? Thank you</div><div><br></div><div>Zhifeng</div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="m_2511226210022219666m_7107694953898554983gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr">Barry H. Lynn, Ph.D<div><div>Senior Associate Scientist, Lecturer,</div><div><div><span style="color:rgb(136,136,136)">The Institute of the Earth Science, </span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">The Hebrew University of Jerusalem, </span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">Givat Ram, Jerusalem 91904, Israel </span><br style="color:rgb(136,136,136)"></div><span style="color:rgb(136,136,136)">Tel: 972 547 231 170</span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">Fax: (972)-25662581</span></div></div><div><span style="color:rgb(136,136,136)"><br></span></div><div>C.E.O, Weather It Is, LTD<br>Weather and Climate Focus<br><a href="http://weather-it-is.com" target="_blank">http://weather-it-is.com</a><br>Jerusalem, Israel<br>Local: 02 930 9525<br>Cell: 054 7 231 170<br>Int-IS: x972 2 930 9525<br><br></div></div></div></div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">!-------------------------------------------------------------------------------------------------------------</font><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">Laura D. Fowler </font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">Mesoscale and Microscale Meteorology Division (MMM) </font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">National Center for Atmospheric Research<br></font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">P.O. Box 3000, Boulder CO 80307-3000</font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)"><br></font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">e-mail: <a href="mailto:laura@ucar.edu" target="_blank">laura@ucar.edu</a></font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">phone: 303-497-1628</font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)"><br></font></div><div><font face="arial, helvetica, sans-serif" color="#0000ff" style="background-color:rgb(255,255,255)">!-------------------------------------------------------------------------------------------------------------</font><br></div></div></div>