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The North Atlantic Oscillation Index
The NAO index shows large variations from year to year. This interannual signal was especially strong during the end of the 19th century.
Sometimes the NAO index stays in one phase phase for several years in a row. This decadal variability was quite strong at the beginning and end of the 20th century.
One might also interpret the recent 30 years as a trend in the NAO index possibly linked to "global warming".
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