Re: space-time spectra over a specified domain

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)
| >
| > _______________________________________________
| > ncl-talk mailing list
| > List instructions, subscriber options, unsubscribe:
| > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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Received on Wed Feb 8 11:36:19 2012