Fig. 4: Mechanism for multidecadal variation of the North Pacific component of the AO.
From: Atlantic multidecadal variability controls Arctic-ENSO connection
a 21-year running correlation between the spring Aleutian Low index and the NAO index (blue curve). AMV index is also shown in (a). b Scatter diagram of the AMV index against the spring ALI-NAO correlation with a 21-yr moving window. c Scatter diagram of the North Pacific component of the spring AO against the ALI-NAO correlation with a 21-yr moving window. d Scatter diagram of the spring ALI-NAO correlation against the spring AO-ENSO correlation with a 21-yr moving window. Red lines in (e–g) indicate the best linear fit, and gray lines indicate the 95% confidence range of the linear regression. Anomalies of spring SLP (e, f, unit: hPa), 500-hPa geopotential height and wave activity flux (g, h, unit: m) regressed on the spring NAO index during positive and negative AMV phases. Anomalies significant at the 95% confidence level are stippled in (e–h).
