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Arctic Oscillation (AO)

The AO index indicates the predominance of a characteristic pattern of atmospheric circulation over the Arctic. view pattern »

Data source and calculation

The index is calculated by NOAA/CPC (last update 15-OCT-2016). view details of calculation »

The standard deviation of the index over the period 1948-2005 is indicated on the plot. get series (netcdf 12kB) »