From AMS Glossary
Revision as of 20:09, 26 January 2012 by Perlwikibot
- A linkage between weather changes occurring in widely separated regions of the globe.
- A significant positive or negative correlation in the fluctuations of a field at widely separated points.
Most commonly applied to variability on monthly and longer timescales, the name refers to the fact that such correlations suggest that information is propagating between the distant points through the atmosphere.