<div dir="ltr"><div><div><div><div>[1] Spherical harmonics are used to compute divergence (highly accurate)<br><br></div>[2] Spherical harmonics are used to derive the divergent wind components. from a divergence field.<br><br></div>see: <a href="http://www.ncl.ucar.edu/Applications/wind.shtml">http://www.ncl.ucar.edu/Applications/wind.shtml</a><br><br>===<br></div>These codes used by NCL are described at: <br> <a href="https://www2.cisl.ucar.edu/resources/legacy/spherepack">https://www2.cisl.ucar.edu/resources/legacy/spherepack</a><br><br></div>Thses codes require the data to be global.<br><div><br><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/uv2dvF-1.shtml">http://www.ncl.ucar.edu/Document/Functions/Built-in/uv2dvF-1.shtml</a><br><br></div><div>The _Wrap means that NCL will append meta data.<br><br><br></div><div><div><div><br><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Dec 19, 2014 at 10:59 AM, Abdoulaye SY <span dir="ltr"><<a href="mailto:sy.abdoulaye3@ugb.edu.sn" target="_blank">sy.abdoulaye3@ugb.edu.sn</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><div><div><div>Hi<br><br></div>I want to calculate divergence of the water vapor flux with ncl.<br><br></div>I use <b> div = uv2dvF_Wrap(qu,qv) <br> </b><br><b> </b>and<b> dv2uvf (div, ud, vd)<br> </b>where qu and qv are water vapor flux zonal and meridional respectively.<br><br></div>I want to understand the<span lang="en"><span> Principles</span> <span>of</span> <span>operation</span></span> of these functions. I have read the documentation but it is not clear.<br><br></div>thanks</div>
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