Re: eofunc_varimax temporal patterns

From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>
Date: Wed, 24 Jun 2009 11:27:52 -0600

Lola Corre wrote:
> Hi,
> I am trying to use the function eofunc_varimax.
> I can obtain the spatial patterns of the rotated EOFs, but could you
> please help me to have the temporal patterns?
> I have read in NCL help that "the temporal patterns are derived by
> projecting the rotated spatial patterns onto the data".
> Do I have to multiply the rotated EOF spatial pattern array (lat, lon)
> by the data array (lat, lon, time) ?
> If yes, is it possible to do it with NCL?
> Thanks a lot,
> Lola.
Well, mechanically, the
function can be used to create a time series. Just place the reordered
varimax eigenvector patterns into the calling sequence.

Note: Conventional EOF analysis yields EOF patterns that are all
orthogonal and the reconstructed amplitude time series are independent.
However, after rotating the EOFs, the orthogonal restraint has been
compromised. This confounds the interpretation of the time series resulting
from projecting the rotated EOFs onto the data.


Dennis J. Shea                  tel: 303-497-1361    |
P.O. Box 3000                   fax: 303-497-1333    |
Climate Analysis Section                             |
Climate & Global Dynamics Div.                       |
National Center for Atmospheric Research             |
Boulder, CO  80307                                   |
USA                        email: shea 'at' |
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Received on Wed Jun 24 2009 - 11:27:52 MDT

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