[ncl-talk] space-time cross spectral analyses

[Dennis Shea]

I have not used NCL's 2D-ffts other than in a trivial fashion so I am not
confident in offering usage advice.

http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2df.shtml
http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2db.shtml
---
Nobody has contacted me regarding any function(s) that do 'space-time
spectral analysis'

Sorry


On Mon, Feb 13, 2017 at 3:38 PM, Xi Chang <xi.chang01 at gmail.com> wrote:

> Hi Denis,
>
> No, I meant a 2D FFT cross spectrum. I want to calculate the co-spectrum
> as a function
> of wavenumber and frequency as done by Randel and Held (1991):
>
> Phase Speed Spectra of Transient Eddy Fluxes and Critical Layer
> <http://journals.ametsoc.org/doi/pdf/10.1175/1520-0469(1991)048%3C0688%3APSSOTE%3E2.0.CO%3B2>
>
> Chang,
>
>
> On Mon, Feb 13, 2017 at 4:10 PM, Dennis Shea <shea at ucar.edu> wrote:
>
>> Not sure of your semantics: "space-time cross spectral analyses"
>>
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/specxy_anal.shtml
>>
>> http://www.ncl.ucar.edu/Applications/spec.shtml
>> See Example 2
>>
>> On Mon, Feb 13, 2017 at 2:47 PM, Xi Chang <xi.chang01 at gmail.com> wrote:
>>
>>> Dear NCL users,
>>>
>>> Anybody has a suggestion or code to compute space-time cross-spectrum
>>> between 2 variables? I need to have the co-spectrum output as a function
>>> of "k and frequency".
>>>
>>> Thank you.
>>> Chang.
>>>
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>>
>
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