<div dir="ltr">Hi Lara,<div>You are passing in your original data into advect_variable instead of the regridded variables. Change this:</div><div><span style="color:rgb(39,78,19);font-family:arial,sans-serif;font-size:12.8px;font-style:italic;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"> adv_vrt = advect_variable(u, v, wr, 1, "vorticity advection", "(m/s)(s-1)",0) </span><br></div><div><span style="color:rgb(39,78,19);font-family:arial,sans-serif;font-size:12.8px;font-style:italic;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">to this:</span></div><div><span style="color:rgb(39,78,19);font-family:arial,sans-serif;font-size:12.8px;font-style:italic;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(39,78,19);font-family:arial,sans-serif;font-size:12.8px;font-style:italic;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"> adv_vrt = advect_variable(u_reclin, v_reclin, wr_reclin, 1, "vorticity advection", "(m/s)(s-1)",0) </span><br></span></div><div><span style="color:rgb(39,78,19);font-family:arial,sans-serif;font-size:12.8px;font-style:italic;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span style="color:rgb(39,78,19);font-family:arial,sans-serif;font-size:12.8px;font-style:italic;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;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;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Gaussian grids are indeed rectlinear grids. See the definition here:</span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;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;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><a href="https://www.ncl.ucar.edu/Document/glossary.shtml#RectilinearGrid">https://www.ncl.ucar.edu/Document/glossary.shtml#RectilinearGrid</a> </span><br></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;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;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;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;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">If you have any further questions please respond to ncl-talk.</span></div><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;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;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Adam</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, May 22, 2018 at 7:24 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">First of all, I apologize for asking you so many questions and for this long email.<div><br></div><div>I'm trying to interpolate the WRF u,v, relative vorticity to a rectilinear grid and use the <b>advect_variable</b> on the rectilinear grid. However, I have obtained this warning and I do not know how to fixed it: <b><font color="#660000">advect_var: Warning: No named dimensions. Can not check grid order.</font></b></div><div><br></div><div>After defining the diverse variables, I have performed the regrid in this way:</div><div><br></div><div><div><i><font color="#274e13">;=============================<wbr>==============================<wbr>=====================</font></i></div><div><i><font color="#274e13">; Part A: WRF (curvilinear) to Rectilinear regrid variable and generate weights </font></i></div><div><i><font color="#274e13">;=============================<wbr>==============================<wbr>=====================</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;Interpolate the WRF u, v and relative vorticity to a rectilinear grid with as fine [or finer] resoultion as the WRF grid</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Set up options for regridding</font></i></div><div><i><font color="#274e13"> </font></i></div><div><i><font color="#274e13"> InterpMethod= "bilinear" ; define interpolation method</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Title and filename options</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13"> Opt = True</font></i></div><div><i><font color="#274e13"> Opt@SrcTitle = "WRF grid" ; optional</font></i></div><div><i><font color="#274e13"> Opt@WgtFileName = "WRF_to_Rect.WgtFile_"+InterpM<wbr>ethod+"."+nlat+"_x_"+nlon+".<wbr>nc"</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Source grid options</font></i></div><div><i><font color="#274e13"> Opt@SrcFileName = "WRF.SCRIP_grid_description."+<wbr>nlat+"_x_"+nlon+".nc" ; Name of source and</font></i></div><div><i><font color="#274e13"> Opt@SrcRegional = True</font></i></div><div><i><font color="#274e13"> Opt@SrcGridLat = lat2d</font></i></div><div><i><font color="#274e13"> Opt@SrcGridLon = lon2d</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Destination grid options</font></i></div><div><i><font color="#274e13"> Opt@DstFileName = "Rectilinear.SCRIP_grid_descri<wbr>ption."+nlat+"_x_"+nlon+".nc" ; destination files</font></i></div><div><i><font color="#274e13"> Opt@DstGridType = "rectilinear"</font></i></div><div><i><font color="#274e13"> Opt@DstGridLat = lat</font></i></div><div><i><font color="#274e13"> Opt@DstGridLon = lon</font></i></div><div><i><font color="#274e13"> Opt@DstRegional = True</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Specify other options </font></i></div><div><i><font color="#274e13"> Opt@ForceOverwrite = True</font></i></div><div><i><font color="#274e13"> Opt@InterpMethod = InterpMethod</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Perform the regrid: WRF ==> rectilinear (_reclin)</font></i></div><div><i><font color="#274e13"> u_reclin = ESMF_regrid(u, Opt) ; Do the regridding for u </font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Use the just generated weight file</font></i></div><div><i><font color="#274e13"> v_reclin = ESMF_regrid_with_weights(v,Opt<wbr>@WgtFileName,False)</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">;---Perform the regrid for wr: WRF ==> rectilinear (_reclin)</font></i></div><div><i><font color="#274e13"> wr_reclin = ESMF_regrid_with_weights(wr, Opt@WgtFileName,False) </font></i></div></div><div><i><font color="#274e13"><br></font></i></div><div><font color="#000000">Afterwards, I use the <b>advect_variable:</b></font></div><div><font color="#000000"><b><br></b></font></div><div><div style="color:rgb(39,78,19);font-style:italic">;=============================<wbr>==============================<wbr>===========</div><div style="color:rgb(39,78,19);font-style:italic">;Use 'advect_variable' on the rectilinear grid</div><div style="color:rgb(39,78,19);font-style:italic">;=============================<wbr>==============================<wbr>===========</div><div style="color:rgb(39,78,19);font-style:italic"><br></div><div style="color:rgb(39,78,19);font-style:italic"> adv_vrt = advect_variable(u, v, wr, 1, "vorticity advection", "(m/s)(s-1)",0) ;I use gridType=1. I suppose rectilinear and fixed grid are quite similar, or even, the same.</div><div style="color:rgb(39,78,19);font-style:italic"><br></div><div style="color:rgb(39,78,19);font-style:italic"> printVarSummary(adv_vrt) </div><div style="color:rgb(39,78,19);font-style:italic"> printMinMax(adv_vrt,0)</div><div style="color:rgb(39,78,19);font-style:italic"> print("----")</div><div style="color:rgb(39,78,19);font-style:italic"><br></div><div><font color="#000000">Finally, I obtain this results and I do not know if they are correctly calculated:</font></div></div><div><font color="#000000"><br></font></div><div><div><i><font color="#274e13">Variable: <b>u_reclin</b></font></i></div><div><i><font color="#274e13">Type: float</font></i></div><div><i><font color="#274e13">Total Size: 5972400 bytes</font></i></div><div><i><font color="#274e13"> 1493100 values</font></i></div><div><i><font color="#274e13">Number of Dimensions: 3</font></i></div><div><i><font color="#274e13">Dimensions and sizes:<span style="white-space:pre-wrap"> </span>[bottom_top | 35] x [lat | 180] x [lon | 237]</font></i></div><div><i><font color="#274e13">Coordinates: </font></i></div><div><i><font color="#274e13"> lat: [25.832275390625..40.830703735<wbr>35156]</font></i></div><div><i><font color="#274e13"> lon: [-34.179443359375..-9.30551147<wbr>4609375]</font></i></div><div><i><font color="#274e13">Number Of Attributes: 8</font></i></div><div><i><font color="#274e13"> missing_value :<span style="white-space:pre-wrap"> </span>9.96921e+36</font></i></div><div><i><font color="#274e13"> remap :<span style="white-space:pre-wrap"> </span>remapped via ESMF_regrid_with_weights: Bilinear</font></i></div><div><i><font color="#274e13"> _FillValue :<span style="white-space:pre-wrap"> </span>9.96921e+36</font></i></div><div><i><font color="#274e13"> stagger :<span style="white-space:pre-wrap"> </span> </font></i></div><div><i><font color="#274e13"> units :<span style="white-space:pre-wrap"> </span>m s-1</font></i></div><div><i><font color="#274e13"> description :<span style="white-space:pre-wrap"> </span>x-wind component</font></i></div><div><i><font color="#274e13"> MemoryOrder :<span style="white-space:pre-wrap"> </span>XYZ</font></i></div><div><i><font color="#274e13"> FieldType :<span style="white-space:pre-wrap"> </span>104</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>u_reclin: min=-21.454 max=49.9299</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>----</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">Variable: <b>v_reclin</b></font></i></div><div><i><font color="#274e13">Type: float</font></i></div><div><i><font color="#274e13">Total Size: 5972400 bytes</font></i></div><div><i><font color="#274e13"> 1493100 values</font></i></div><div><i><font color="#274e13">Number of Dimensions: 3</font></i></div><div><i><font color="#274e13">Dimensions and sizes:<span style="white-space:pre-wrap"> </span>[bottom_top | 35] x [lat | 180] x [lon | 237]</font></i></div><div><i><font color="#274e13">Coordinates: </font></i></div><div><i><font color="#274e13"> lat: [25.832275390625..40.830703735<wbr>35156]</font></i></div><div><i><font color="#274e13"> lon: [-34.179443359375..-9.30551147<wbr>4609375]</font></i></div><div><i><font color="#274e13">Number Of Attributes: 8</font></i></div><div><i><font color="#274e13"> _FillValue :<span style="white-space:pre-wrap"> </span>9.96921e+36</font></i></div><div><i><font color="#274e13"> stagger :<span style="white-space:pre-wrap"> </span> </font></i></div><div><i><font color="#274e13"> units :<span style="white-space:pre-wrap"> </span>m s-1</font></i></div><div><i><font color="#274e13"> description :<span style="white-space:pre-wrap"> </span>y-wind component</font></i></div><div><i><font color="#274e13"> MemoryOrder :<span style="white-space:pre-wrap"> </span>XYZ</font></i></div><div><i><font color="#274e13"> FieldType :<span style="white-space:pre-wrap"> </span>104</font></i></div><div><i><font color="#274e13"> remap :<span style="white-space:pre-wrap"> </span>remapped via ESMF_regrid_with_weights: Bilinear</font></i></div><div><i><font color="#274e13"> missing_value :<span style="white-space:pre-wrap"> </span>9.96921e+36</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>v_reclin: min=-51.6305 max=46.8953</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>----</font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">Variable: <b>wr_reclin</b></font></i></div><div><i><font color="#274e13">Type: float</font></i></div><div><i><font color="#274e13">Total Size: 5972400 bytes</font></i></div><div><i><font color="#274e13"> 1493100 values</font></i></div><div><i><font color="#274e13">Number of Dimensions: 3</font></i></div><div><i><font color="#274e13">Dimensions and sizes:<span style="white-space:pre-wrap"> </span>[35] x [lat | 180] x [lon | 237]</font></i></div><div><i><font color="#274e13">Coordinates: </font></i></div><div><i><font color="#274e13"> lat: [25.832275390625..40.830703735<wbr>35156]</font></i></div><div><i><font color="#274e13"> lon: [-34.179443359375..-9.30551147<wbr>4609375]</font></i></div><div><i><font color="#274e13">Number Of Attributes: 3</font></i></div><div><i><font color="#274e13"> _FillValue :<span style="white-space:pre-wrap"> </span>9.96921e+36</font></i></div><div><i><font color="#274e13"> remap :<span style="white-space:pre-wrap"> </span>remapped via ESMF_regrid_with_weights: Bilinear</font></i></div><div><i><font color="#274e13"> missing_value :<span style="white-space:pre-wrap"> </span>9.96921e+36</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>wr_reclin: min=-34.6481 max=63.9581</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>----</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>RectilinearGrid: nmsg=180075</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>----</font></i></div><div><i><font color="#274e13">(0)</font><span style="color:rgb(39,78,19);white-space:pre-wrap"> </span><font color="#660000"><b>advect_var: Warning: No named dimensions. Can not check grid order.</b></font></i></div><div><i><font color="#274e13"><br></font></i></div><div><i><font color="#274e13">Variable: <b>adv_vrt</b></font></i></div><div><i><font color="#274e13">Type: float</font></i></div><div><i><font color="#274e13">Total Size: 5972400 bytes</font></i></div><div><i><font color="#274e13"> 1493100 values</font></i></div><div><i><font color="#274e13">Number of Dimensions: 3</font></i></div><div><i><font color="#274e13">Dimensions and sizes:<span style="white-space:pre-wrap"> </span>[35] x [180] x [237]</font></i></div><div><i><font color="#274e13">Coordinates: </font></i></div><div><i><font color="#274e13">Number Of Attributes: 2</font></i></div><div><i><font color="#274e13"> long_name :<span style="white-space:pre-wrap"> </span>vorticity advection</font></i></div><div><i><font color="#274e13"> units :<span style="white-space:pre-wrap"> </span>(m/s)(s-1)</font></i></div><div><i><font color="#274e13">(0)<span style="white-space:pre-wrap"> </span>vorticity advection ((m/s)(s-1)) : min=-0.0107484 max=0.0109576</font></i></div><div style="color:rgb(0,0,0)"><br></div></div><div><font color="#000000">Unfortunately, I also obtain this errors:</font></div><div><font color="#660000"><br></font></div><div><div><font color="#660000">(0)<span style="white-space:pre-wrap"> </span>is_SCRIP: '<a href="http://Rectilinear.SCRIP_grid_description.nc" target="_blank">Rectilinear.SCRIP_grid_<wbr>description.nc</a>' doesn't exist.</font></div><div><font color="#660000">(0)<span style="white-space:pre-wrap"> </span>ESMF_regrid_gen_weights: invalid or missing SCRIP source grid file.</font></div></div><div><br></div><div>And I obtain this three files:</div><div><b><br></b></div><div><b><a href="http://Rectilinear.SCRIP_grid_description.180_x_237.nc" target="_blank">Rectilinear.SCRIP_grid_<wbr>description.180_x_237.nc</a><br></b></div><div><b><a href="http://WRF.SCRIP_grid_description.180_x_237.nc" target="_blank">WRF.SCRIP_grid_description.<wbr>180_x_237.nc</a><br></b></div><div><b><a href="http://WRF_to_Rect.WgtFile_bilinear.180_x_237.nc" target="_blank">WRF_to_Rect.WgtFile_bilinear.<wbr>180_x_237.nc</a></b><br></div><div><b><br></b></div><div>Which file do I have to use to display the vorticity advection? None, I suppose. They are all description files, except one.</div><div> </div><div>If you need my script, just tell me. </div><div><br></div><div>Thanks in advance.</div><div><br></div><div>Regards, </div><div>Lara</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2018-05-22 11:08 GMT+02:00 Lara Quitián Hernández <span dir="ltr"><<a href="mailto:laraquitianhernandez@gmail.com" target="_blank">laraquitianhernandez@gmail.<wbr>com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Good morning, <div><br></div><div>Thank you very much. There is only one doubt left unanswered: the <b>advect_function </b>requires a <u>Gaussian, regular o fixed grid</u>, but not <u>rectilinear</u>. Is there any relation between them?</div><div><br></div><div>Regards, </div><span class="m_5759546487367864492HOEnZb"><font color="#888888"><div>Lara</div></font></span></div><div class="m_5759546487367864492HOEnZb"><div class="m_5759546487367864492h5"><div class="gmail_extra"><br><div class="gmail_quote">2018-05-21 19:21 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>ESMF 37 was <br>(a) interpolating u and v onto a rectilinear grid; <br>(b) calculating divergence using uv2dv_cfd which requires u and v to be on a rectilinear grid; <br>(c) interpolating the derived divergence on a rectilinear grid back onto the original WRF grid<br><br>---<br></div>In your case:<br><div><br>[1] Interpolate the WRF u, v and relative vorticity to a rectilinear grid with as fine [or finer] resoultion as the WRF grid<br></div><div>[2] Use 'advect_variable' on the rectilinear grid<br>[3] interpolate the advected quantity on the rectilinear grid back onto the original WRF grid<br><br>---<br></div><div>Caveat: Technically, on a sphere, u and v must be interpolated together using the 'rotation' angle.<br></div><div>Why? because the new location has a 'slightly' different orientation relative to the pole(s) <br></div><div><br> unew = u*cos(rot) - v*sin(rot) <br> vnew = u*sin(rot) + v*cos(rot)<br><br></div><div>The above approach, independently interpolating u and v ignores the rotation. It is assumed to be very small.<br><br> <br></div><div><br></div></div><div class="m_5759546487367864492m_2749377207748208251HOEnZb"><div class="m_5759546487367864492m_2749377207748208251h5"><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 21, 2018 at 3:45 AM, Lara Quitián Hernández <span dir="ltr"><<a href="mailto:laraquitianhernandez@gmail.com" target="_blank">laraquitianhernandez@gmail.co<wbr>m</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>Good morning,</div><div><br></div>Thank you so much. Unfortunately, I have some doubts. <div><br></div><div>1.- I have read the information for Example 37 but I do not understand the need of computing the divergence ("uv2dv_cfd"). I just need my variables on a Gaussian, regular o fixed grid in order to apply the <b>advect_variable</b> function</div><div>2.- I need to convert my curvilinear WRF grid to a Gaussian, regular o fixed grid. However, in both Examples (29a and 37) a regrid from a WRF grid to a rectilinear grid is carried out. Are those grids (Gaussian, regular o fixed grid) also rectilinear grids?</div><div>3.-Do I need to regrid back to the WRF curvilinear grid as it is done in both examples?</div><span><div><br></div><div>Thanks in advance. </div><div><br></div><div>Regards, </div><div>Lara</div><div><br></div><div><br></div></span></div><div class="m_5759546487367864492m_2749377207748208251m_3603104038903624767HOEnZb"><div class="m_5759546487367864492m_2749377207748208251m_3603104038903624767h5"><div class="gmail_extra"><br><div class="gmail_quote">2018-05-20 1:10 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><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" target="_blank">https://www.ncl.ucar.edu/Appli<wbr>cations/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="m_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275HOEnZb"><div class="m_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275h5"><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.co<wbr>m</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_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329m_-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.uca<wbr>r.edu/Applications/vort.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="m_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329HOEnZb"><font color="#888888"><div>Lara</div></font></span></div><div class="m_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329HOEnZb"><div class="m_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329h5"><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/adve<wbr>ct_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_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329m_-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_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329m_-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_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329m_-4307035958762947733m_2745945185124896099HOEnZb"><font color="#888888"><div>Lara</div><div><br clear="all"><div><br></div>-- <br><div class="m_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329m_-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_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275m_-4196797236910994329m_-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" 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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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="m_5759546487367864492m_2749377207748208251m_3603104038903624767m_-1059488269469768275gmail_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">Ciudad Universitaria, <a href="https://maps.google.com/?q=Plaza+Ciencias,+1+28040+Madrid.+Spain&entry=gmail&source=g" target="_blank">Plaza Ciencias, 1</a></span></font></div><div><font color="#000000"><span style="font-size:12.8px"><a href="https://maps.google.com/?q=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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</div></div></blockquote></div><br><br clear="all"><span class="HOEnZb"><font color="#888888"><div><br></div>-- <br><div class="m_5759546487367864492m_2749377207748208251gmail_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">Ciudad Universitaria, Plaza Ciencias, 1</span></font></div><div><font color="#000000"><span style="font-size:12.8px">28040 Madrid. Spain</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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</font></span></div></div></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div class="m_5759546487367864492gmail_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">Ciudad Universitaria, Plaza Ciencias, 1</span></font></div><div><font color="#000000"><span style="font-size:12.8px">28040 Madrid. Spain</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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