<div dir="ltr"><div><div><div><div><div><div>NCL has no builtin function to advect a field (eg: vorticity) on a curvilinear grid (eg: your WRF Grid)..<br></div>Maybe ask wrfhelp?<br><br>===<br></div>That said<br><br><a href="https://www.ncl.ucar.edu/Applications/ESMF.shtml">https://www.ncl.ucar.edu/Applications/ESMF.shtml</a><br></div>Example 29a<br></div><div>or, maybe better,<br></div><div>Example 37<br></div><div><br></div>outlines a method that might be used for your needs.<br><br></div>===<br></div>Good luck<br><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 16, 2018 at 7:40 AM, Lara Quitián Hernández <span dir="ltr"><<a href="mailto:laraquitianhernandez@gmail.com" target="_blank">laraquitianhernandez@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">Hello, <div><br></div><div>Thank you. In the case of calculating the horizontal advection for <b>vorticity</b>, it would be better to use the direct WRF variable ( vo = wrf_user_getvar(a,"<b class="m_-4307035958762947733gmail-">avo</b>",-1)) or define it via different functions: <a href="https://www.ncl.ucar.edu/Applications/vort.shtml" target="_blank">https://www.ncl.<wbr>ucar.edu/Applications/vort.<wbr>shtml</a></div><div><br></div><div>The only example in the link defines the Vorticity like this:</div><div><pre style="color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;word-wrap:break-word;white-space:pre-wrap">;*****************************<wbr>*******************
; calculate vorticity on a Gaussian Grid
; scale for visual convenience
;*****************************<wbr>*******************
scale = 1.e05
vrt = u ; retain coordinates
vrt = uv2vrG_Wrap(u,v) * scale
vrt@long_name = "vorticity"
vrt@units = "scaled"</pre></div><div><br></div><div>However, my simulations are generated on a Lambert Conformal grid projection, not Gaussian one. Does this change the procedure to calculate it?</div><div><br></div><div>Regards, </div><span class="HOEnZb"><font color="#888888"><div>Lara</div></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">2018-05-16 14:28 GMT+02:00 Dennis Shea <span dir="ltr"><<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Maybe:<br><br><a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml" target="_blank">https://www.ncl.ucar.edu/Docum<wbr>ent/Functions/Contributed/<wbr>advect_variable.shtml</a><br><br></div>'x' would be vorticity<br><br></div>Good Luck<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="m_-4307035958762947733h5">On Wed, May 16, 2018 at 4:01 AM, Lara Quitián Hernández <span dir="ltr"><<a href="mailto:laraquitianhernandez@gmail.com" target="_blank">laraquitianhernandez@gmail.co<wbr>m</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 class="m_-4307035958762947733h5"><div dir="ltr">Good morning, <div><br></div><div>I would like to know if there is a possibility of calculating the Vorticity Advection with NCL.</div><div><br></div><div>Thanks in advance.</div><div><br></div><div>Regards, </div><span class="m_-4307035958762947733m_2745945185124896099HOEnZb"><font color="#888888"><div>Lara</div><div><br clear="all"><div><br></div>-- <br><div class="m_-4307035958762947733m_2745945185124896099m_-1448946543173881759gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><img src="https://docs.google.com/uc?export=download&id=0B5glieJcogGocjdGWHA3NWIwdmc&revid=0B5glieJcogGocU45NUpENzV4UWhCWk9tb1ZGdXB5MEtGYjJjPQ"><br><div><font color="#000000"><br></font></div><div><b><font color="#000000"><span style="font-size:12.8px">Lara Quitián Hernández, </span></font><span style="color:rgb(0,0,0);font-size:12.8px">PhD Student</span></b><font color="#000000"><b><br style="font-size:12.8px"></b><span style="font-size:12.8px">Departamento de Física de la Tierra, Astronomía y Astrofísica</span><br style="font-size:12.8px"><span style="font-size:12.8px">Facultad de Ciencias Físicas</span><br style="font-size:12.8px"><span style="font-size:13px"><a href="https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g" target="_blank">Ciudad Universitaria, Plaza Ciencias, 1</a></span></font></div><div><font color="#000000"><span style="font-size:12.8px"><a href="https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g" target="_blank">28040 Madrid. Spain</a></span><br style="font-size:12.8px"><span style="font-size:12.8px">Email: </span><a href="mailto:mlunar@aemet.es" style="font-size:12.8px" target="_blank">lquitian@ucm.es</a><br style="font-size:12.8px"></font><br></div></div></div></div></div>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="m_-4307035958762947733gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><img src="https://docs.google.com/uc?export=download&id=0B5glieJcogGocjdGWHA3NWIwdmc&revid=0B5glieJcogGocU45NUpENzV4UWhCWk9tb1ZGdXB5MEtGYjJjPQ"><br><div><font color="#000000"><br></font></div><div><b><font color="#000000"><span style="font-size:12.8px">Lara Quitián Hernández, </span></font><span style="color:rgb(0,0,0);font-size:12.8px">PhD Student</span></b><font color="#000000"><b><br style="font-size:12.8px"></b><span style="font-size:12.8px">Departamento de Física de la Tierra, Astronomía y Astrofísica</span><br style="font-size:12.8px"><span style="font-size:12.8px">Facultad de Ciencias Físicas</span><br style="font-size:12.8px"><span style="font-size:13px"><a href="https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g">Ciudad Universitaria, Plaza Ciencias, 1</a></span></font></div><div><font color="#000000"><span style="font-size:12.8px"><a href="https://maps.google.com/?q=Ciudad+Universitaria,+Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g">28040 Madrid. Spain</a></span><br style="font-size:12.8px"><span style="font-size:12.8px">Email: </span><a href="mailto:mlunar@aemet.es" style="font-size:12.8px" target="_blank">lquitian@ucm.es</a><br style="font-size:12.8px"></font><br></div></div></div></div></div>
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