Thanks guys for a quick reply.<div>I have one more concern, in the example of "temperature advection" why the units in m.K/s instead of K/s?? is it also a typo? how does this fubction compute the gradient? i assume the gradient must be in K/m in lon and lat direction.</div><div><br></div><div>Chang<span></span><br><br>On Monday, 25 January 2016, Dennis Shea <<a href="mailto:shea@ucar.edu">shea@ucar.edu</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">That was an error in the 6.3.0 release note. Apologies!<br>
<br>
Try using : advect_var reather than advect_variable<br>
<br>
<br>
=====<br>
<br>
<br>
The 6.3.0 had:<br>
<br>
New functions<br>
<br>
advect_var - Advect a variable horizontally: U*(dQ/dlon) +<br>
V*(dQ/dlat). This function was inadvertently advertised as<br>
advect_variable. The 6.3.1 release will support advect_variable name<br>
as an alias.<br>
<br>
<a href="https://www.ncl.ucar.edu/future_release.shtml" target="_blank">https://www.ncl.ucar.edu/future_release.shtml</a><br>
<br>
<br>
If you look at the 6.4.0 release note<br>
<br>
Bugs fixed<br>
<br>
The advect_var function can also be accessed via an alias name:<br>
advect_variable. This addresses a documentation error in the 6.3.0<br>
release.<br>
<br>
On Mon, Jan 25, 2016 at 9:57 AM, Xi Chang <<a href="javascript:;" onclick="_e(event, 'cvml', 'xi.chang01@gmail.com')">xi.chang01@gmail.com</a>> wrote:<br>
> Hallo,<br>
> Im using NCL v.6.3.0, why I cannot use this function<br>
> <a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml" target="_blank">https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml</a><br>
><br>
> Thanks<br>
> Chang.<br>
><br>
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</blockquote></div>