<div dir="ltr"><div><div><div><div>The Arakawa C-grid has the U, V and scalar (?T?) variables on separate grids. <br><br></div>To *my* knowledge, the ESMF regrid package does not interpolate vector wind components. Wind components should be interpolated together on the sphere. The wind speed is conserved but the magnitudes of the wind components will vary. For u and v on the same grid<br><br>
uNew = u*cos(rot) - v*sin(rot) ; rot - <span class="gmail-il">rotation</span> angle<br>
vNew = u*sin(rot) + v*cos(rot)<br>
<br></div>Actually, on the Arakawa C-grid, since u and v are on separate grids the appropriate rotation angles would be different also.<br><br>---<br></div>What is the objective of the interpolation? <br><br>If it is 'just' graphics, then, maybe, interpolating the the V-grid and U-grid separately to the T-grid would be acceptable. <br><br></div>---<br><div><div><div>
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<br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 29, 2017 at 3:31 AM, Francesco Trotta <span dir="ltr"><<a href="mailto:francesco.trotta4@unibo.it" target="_blank">francesco.trotta4@unibo.it</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" style="font-size:12pt;color:#000000;background-color:#ffffff;font-family:Calibri,Arial,Helvetica,sans-serif">
<div>Dear ncl team,</div>
<div> I using ncl and I’m producing 2 netcdf files of meridional e zonal velocity definite on the stagarate grid (C_arakawa U e V grids) and I need to pass this datasets to a collage on a unique T grid.</div>
<div><br>
</div>
<div> Is there in ncl some build-in-function which from 2 netcdf file with u e v defined in a staggered U e V grid produce a file with u and v field interpolate on T grid?</div>
<div><br>
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<div>thanks</div><span class="HOEnZb"><font color="#888888">
<div>Francesco<br>
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