Unspecified
Arctic Report Card 2007.
Project Report.
NOAA.
Abstract
The annually averaged Arctic Oscillation index (AO, a measure of the strength of circumpolar
winds) was slightly positive in 2006, continuing the trend of a relatively low and fluctuating index
which began in the mid-1990s (Figure A1). This follows a strong, persistent positive pattern from
1989 to 1995. The current characteristics of the AO are more consistent with the characteristics
of the period from the 1950s to the 1980s, when the AO switched frequently between positive
and negative phases. Initial data from 2007 shows a positive AO pattern.
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