Re: Power spectrum

Hi Louis,

It should be pretty straightforward to do. I have done this myself. I need a
few days to dig up the code (after 23rd.. i am on a business trip till
then). Basically you define the longitude domain, zonally average over that
domain, and create a spectrum for each time series at the latitude points
and plot it. Examples of power spectrum analysis can be found easily from
the NCL home page..

cheers,

saji

On Mon, Sep 20, 2010 at 5:00 PM, louis Vonder <appopson@yahoo.fr> wrote:

> Dear all,
> I facing the following problem:
> I want to draw the power spectrum of the mean daily cycle of the zonal wind
> (from NCEP/NCAR reanalysis) greater than a given threshold in the Hovmöller
> space.
>
> I want to represent the power spectrum such that latitude in x-axis and
> period in y-axis.
>
> An example of what I am trying to do is available in Figure 14a of
> R. E. CARBONE, J. D. TUTTLE, D. A. AHIJEVYCH, AND S. B. TRIER
> Inferences of Predictability Associated with Warm Season Precipitation
> Episodes, 2002, JOURNAL OF THE ATMOSPHERIC SCIENCES, 59, 2033-2056.
>
>
> There is any way to do it with NCL?
>
> Best regards
>
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Received on Mon Sep 20 07:08:55 2010