[ncl-talk] The problem about the inverse Laplacian function in spherical harmonics

[Dennis Shea]

NCL uses a double precision version of Spherepack

*https://www2.cisl.ucar.edu/resources/legacy/spherepack/documentation*
<https://www2.cisl.ucar.edu/resources/legacy/spherepack/documentation>

The original f77 code can be downloaded by clicking on the link.

===




On Mon, Oct 8, 2018 at 9:12 PM Hoa Dao <hoadao0610 at gmail.com> wrote:

> Hi,
>
> Several days ago, I used the ilapsG function as a step to calculate the
> rotational wind and divergent wind, regarding to this online script:
> https://www.ncl.ucar.edu/Applications/Scripts/wind_4.ncl
> The data I used is Era-Interim reanalysis, and because I forgot to reverse
> the latitudinal direction to which from South to North, the results became
> weird and full of deformation regions, as follows:
>
> [image: image.png]
>
> I used to have doubts about misusing the Hemholtz equation instead of
> Poisson equation to solve the problem, but it wasn't that.
> Turns out reversing the latitude direction is the answer, but I don't know
> how it works. Can you send me some references and the source code that
> contributes to this inverse Laplacian function?  I cannot find the function
> source code anywhere (I chose to use the binary installation).
> Thank you in advance for your help.
>
> --
>
> ------------------------------------------------------------------------------------------------------------------------------------
> *Dao Nguyen Quynh Hoa*
> Contact: +84 (0)125 775 8771
> Department of Meteorology
> Faculty of Hydrology Meteorology and Oceanography
> Hanoi University of Science (HUS) - Vietnam National University (VNU)
> No. 334 - Nguyen Trai Str. - Thanh Xuan Distr. - Hanoi - Vietnam
> Email: *hoadao0610 at gmail.com <hoadao0610 at gmail.com>*
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