[ncl-talk] About calculating divergence in WRF

[Dennis Shea]

I am not sure about "mositure divergence" on WRF grids. To my knowledge,
there is no NCL function to compute divergence on some arbitrary WRF grid.
As noted by Evelyn Grell in her comments about vorticity, the function
would have to make use of map factors.

The example you refer to interpolates the u,v components on a WRF
(curvilinear) grid to a rectilinear grid of approximately the same
resolution. The divergence is calculated on the rectilinear grid using
uv2dv_cfd and the reinterpolated back to the WRF grid. As noted in the
previous response, this approach is likely adequate for graphical purposes.
However, the correct way is to calculate the divergence on the original
grid.

The following is an example

https://www.ncl.ucar.edu/Applications/ESMF.shtml
Example 29

https://www.ncl.ucar.edu/Applications/Scripts/ESMF_regrid_29.ncl





Example 5


On Fri, Nov 4, 2016 at 1:37 PM, Deng Xu <dengxu89 at hotmail.com> wrote:

> To whom it may concern,
>
>
>
> Hi, I found some information about calculating moisture divergence in WRF
> in your previous ncl-talk mailing list. The link is:
> https://www.ncl.ucar.edu/Support/talk_archives/2010/1066.html.
>
>
>
> I wonder why, after calculating the divergence, I have to * interpolate
> back to the original WRF coordinates. Is there any example scripts?*
>
>
>
> *Hope you could help me!*
>
>
>
> *Thank you in advance!*
>
> *Xu Deng*
>
>
>
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