<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>ESMF Regridding: <a href="http://www.ncl.ucar.edu/Applications/ESMF.shtml"><b>http://www.ncl.ucar.edu/Applications/ESMF.shtml</b></a><br></div><div><br></div><div>Likely, you have <br></div><div><br></div><div>Source grid:<br></div><div> LAT[*], LON[*] <br></div><div><br></div><div>Destination (staggard) grids <br></div><div><br></div><div>XLONG_U[*][*], XLAT_U[*][*] [Note: if 3D; xlatu = f->XLAT_U(0,:,:)<br></div><div><br></div><div>XLONG_V[*][*], XLAT_V[*][*]</div><div><br></div><div>You will have to create separate U and V scripts.</div><div><br></div><div>The WRF grid is similar to the NARR grid: curvilinear</div><div><br></div><div>See: <a href="http://www.ncl.ucar.edu/Applications/Scripts/ESMF_wgts_30.ncl">ESMF_wgts_30.ncl <br></a></div><div><br></div><div>ESMF_29 also</div><div><br></div><div>====</div><div><br></div><div>Note that when zonal and meridional winds are interpolated to a new location, they (technically) should be done together. Actually, *any* vector pair
must be rotated together. However, almost all interpolation methods
ignore this. Something like,
<br>
</div><div><p> uNew = u*cos(rot) - v*sin(rot)
<br>
vNew = u*sin(rot) + v*cos(rot)
<br>
</p><p>Of course, you must provide the rotation angle (rot)</p></div><div>===</div><div>Good Luck<br></div><div><br></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 11, 2019 at 9:52 PM Babitha George <<a href="mailto:babigeorge27@gmail.com">babigeorge27@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hai,<div><br></div><div>Is it possible to convert wind components from unstaggered grid to staggered grid in NCL? I know the reverse is possible using wrf_user_unstagger.</div><div><br></div><div>In wanted to perturb the wind components in an analysis file and run the WRF model using that analysis.</div><div><br></div><div>Can someone please help me in this?</div><div><br></div><div>Thank you <br clear="all"><div>Babitha</div><br><div dir="ltr" class="gmail-m_1845319740699590301gmail_signature"><div dir="ltr"><font face="arial narrow, sans-serif">Babitha George</font><div><font face="arial narrow, sans-serif">Research Scholar</font></div><div><font face="arial narrow, sans-serif">Indian Institute of Space Science and Technology</font></div><div><font face="arial narrow, sans-serif">Thiruvananthapuram, Kerala</font></div><div><br></div></div></div></div></div>
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