Fig.3.　Absolute amplitudes (contour) and phases (color) of the relative MWF SLPs with respect to the phase at 50°N, 165°W. The contour interval is 1 hPa, and the phases are colored for the region where the amplitudes are grater than 0.5 hPa.

　

Fig.4.　Squared coherency (top) and phase (bottom) for the winter SLPs between 45°N, 140°W and 60°N, 180°. The dashed line in the top panel indicates the 95% confidence limit of the coherency, and the error bars in the bottom panel indicates the 95% confidence intervals of the phase spectra. The significant bidecadal coherence peak is accompanied by the significant phase lag (SLP at 45°N, 140°W leading SLP at 60°N, 180°).

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