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The NAO is the dominant mode of atmospheric variability in the north Atlantic throughout the year and particularly prominent in the winter.
Nomad, when people talk about "dominant mode of variability" in this context, is it much more than a statistically derived principal component of the system? In other words, is it just descriptive or is there a real understanding of its dynamics and role?

Of all the ways of organizing banking, the worst is the one we have today — Mervyn King, 25 October 2010
by Migeru (migeru at eurotrib dot com) on Thu Dec 9th, 2010 at 06:17:36 AM EST
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