Re: EOF NAO different sign convention?

As long as the eof produces opposite signs between the centers, that
is OK.
If you prefer the northern center to be negative and southern center
to be
positive, multiply the pattern and time series by -1. Should be fine.
Mike

On Aug 8, 2007, at 10:14 AM, Simone Marras wrote:

> Good morning everyone,
>
> I was starting to use the eof_1.ncl function from
> http://www.ncl.ucar.edu/Applications/eof.shtml
>
> with some WACCM and ERA40 products; I am a little surprised in
> finding that
> the sign for the NAO SLP patterns seem to be opposite to the
> standard usually
> found in EOF outputs (I computed the EOF for DJF and JJA).
>
> I would expect negative region on the top and positive on the
> bottom instead
> of the other way around.
>
> Am I misunderstanding anything? Is there any sign convention that
> are being
> used in the NCL eof_1.ncl function?
>
> Thanks in advance
>
> Simone
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Received on Wed Aug 08 2007 - 09:21:38 MDT