NAO N.Atl SST cross-spectrum (freq)

The same spectrum, displayed as period instead of frequency is shown, with its derivation here:
https://climategrog.wordpress.com/?attachment_id=898

Phase relationship here:
https://climategrog.wordpress.com/?attachment_id=900

The lanczos filter used begins to attenuation at 0.5 per year and progresses fairly linearly cut everything beyond 1 per year.

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