[ncl-talk] Filter Rossby and Kelvin Waves in Ocean

[Carl Schreck]

Similar to kf_filter, the wkSpaceTime function assumes that the data are
cyclic in the zonal direction. Unfortunately, you will probably have to do
this manually using fft2df
<http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2df.shtml> and
fft2db <http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2db.shtml>.

We have received similar questions before, so please share if you do write
a function. It would be a good addition to NCL.

Carl

On Sun, Mar 4, 2018 at 10:02 PM, Wickramage Chathurika <
wickramagechathurika at rocketmail.com> wrote:

> Hello All,
>
>
> I want to filter Kelvin and Rossby waves in the ocean like which has done
> using wkSpaceTime. But I cannot understand clearly how it is working and
> how to apply each and every argument properly. specially;
>
>
> *nDayWin:Wheeler-Kiladis [WK] temporal window length (days)*
>
> *nDaySkip:time (days) between temporal windows [segments]*
>
> *kMin /kMax:Range of wavenumbers, can be positive (eastward) or negative (westward) in kf_filter function*
>
> I am really appriciate if anyone can give an example for ocean Rossby and Kelvin wave filtering.
>
> Thank you so much
> Kind regards,
> Chathu
>
>
>
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>


-- 

<https://ncics.org/> *Carl J. Schreck III, PhD*
*Research Scholar*
North Carolina State University <http://ncsu.edu/>
North Carolina Institute for Climate Studies (NCICS) <https://ncics.org/>
151 Patton Ave, Asheville, NC 28801
e: cjschrec at ncsu.edu
o: +1 828 257 3140 <(828)%20257-3140>
c: +1 828 484 1702 <(828)%20484-1702>
Publications
<http://scholar.google.com/citations?hl=en&user=th8ONEcAAAAJ&view_op=list_works&sortby=pubdate>
ncics.org/mjo
CycloneCenter.org <https://www.cyclonecenter.org/>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180305/29a782e3/attachment-0001.html>