Re: space-time spectra over a specified domain

Hello,

Very nice scientific objective ....

BUT ...

This is way above and beyond what support of a software tool
is supposed to entail. I am not paid by the NCL project.
I do this as a 'volunteer'.

You are 'new to NCL' so that would make it even more time consuming,
since I would have to discuss many NCL features. In practice,
I would end up doing the programming. Some MJO diagnostics are
zonally oriented. To to this meridionally would involve a complete rewrite.

Very sorry, but I just don't have the time.

Good luck on your project.

On 2/8/12 11:29 AM, Bidyut Bikash Goswami wrote:
> Thank you Sir.
>
> But my actual intention was to do a north-south space-time spectra. That is the reason why I wanted to know how to do it over a bounded domain, because unlike MJOs, the northward propagating Indian summer monsoon ISOs are seen only over the Indian region.
>
> Can you please leave your suggestions in this regard ... how to do it for north-south spectra.
>
> I have gone through the thread http://www.ncl.ucar.edu/Support/talk_archives/2010/0071.html, but if possible can you kindly be a little more elaborative ... as I am still a newbie in NCL.
>
> Thanks and Regards.
>
> Bidyut Bikash Goswami
> Research Fellow
> Indian Institute of Tropical Meteorology
> Dr. Homi Bhabha Road
> Pashan
> Pune-411008
> Telephone:+91 20 25904226 (O)
>
> ----- Original Message -----
> | From: "Dennis Shea"<shea@ucar.edu>
> | To: "Bidyut Bikash Goswami"<bidyut@tropmet.res.in>
> | Cc: ncl-talk@ucar.edu
> | Sent: Wednesday, February 8, 2012 11:10:37 PM
> | Subject: Re: space-time spectra over a specified domain
> | This and other space-time functions in this package
> | assume the data are periodic in longitude. I suggest
> | altering the data that are input to just the region of interest.
> |
> | latS = -10. ; latitude band
> | latN = 10. ; symmetric about equator
> |
> | lonL = 30. ; longitude segment
> | lonR = 120.
> |
> | Then later,
> |
> | x = dim_avg_n_Wrap( X, 1 ) ; (time,lon)
> | printVarSummary(x)
> |
> | ;************************************************************
> | ; Create necessary regional data
> | ; (a) Remove zonal (longitudinal) means at each time
> | ; (b) Set all data outside chosen longitudes to 0.0
> | ; (c) Taper the data in the region
> | ;************************************************************
> | xZon = dim_avg_n_Wrap( x, 1 )
> | printVarSummary(xZon) ; xZon(time)
> |
> | x = x - conform(x, xZon, 0) ; remove zonal mean at each time step
> | printVarSummary(x) ; [time | 9497] x [lon | 144]
> |
> | LON = conform(x, x&lon, 1)
> | x = where(LON.lt.lonL .or. LON.gt.lonR, 0.0, x)
> |
> | x(:,{lonL:lonR}) = taper(x(:,{lonL:lonR}), 0.1, 0)
> |
> |
> | On 2/7/12 10:56 PM, Bidyut Bikash Goswami wrote:
> |> Hi,
> |>
> |> I want to plot the space-time spectra over a specified domain(say
> |> indian region) using
> |> http://www.ncl.ucar.edu/Document/Functions/Diagnostics/mjo_wavenum_freq_season.shtml
> |> (using the script mjoclivar_10.ncl).
> |>
> |> In order to do this, please suggest me regarding the required
> |> modifications needed to be done in the file
> |> http://www.ncl.ucar.edu/Document/Functions/Diagnostics/diagnostics_cam.shtml.
> |> Please specify the places where I need to put the longitude
> |> boundaries, in diagnostics_cam file.
> |>
> |> Regards,
> |>
> |> Bidyut Bikash Goswami
> |> Research Fellow
> |> Indian Institute of Tropical Meteorology
> |> Dr. Homi Bhabha Road
> |> Pashan
> |> Pune-411008
> |> Telephone:+91 20 25904226 (O)
> |>
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Received on Wed Feb 8 11:51:40 2012