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5. Composites with respect to the QBO phases
Figures 1a -1b
Upper: Zonal wind at 50 hPa. Large positive difference in November means that the polar-night jet is stronger in the W, that is, the deceleration in this season occurs earlier in the E.
Lower: Zonal wind at 300hPa. Positive signal moves slowly from the equator to the higher latitudes during winter and spring.
Figure 2a - 2b
Upper: Monthly mean zonal wind. Large positive difference appears near the equator in August, and moves poleward and downward to be found at 50hPa in November.
Lower: EQ flux (vectors) and its divergence (color tone). The vectors are divided by ? a cos ?. Downward vectors and blue tone around 60S indicate larger upward flux and larger convergence in the E.
Figure 3
Schematic illustration for considering income and outgo of the momentum for the "boxes". In the upper box, the large convergence is associated with the large income from the lower box. As for the lower box, the relationship between the upward outgo to the upper box and the equatorward one is interesting.
Figure 4
(a) Zonal wind at 50hPa, 60S. (b) EP flux divergence at the same. (c) Up;ward flux at 100hPa. (d) Equatorward flux at 40S. (e) Zonal wind at 300hPa, 40S.
Note that the planetary-scale compornents are dominant for (c) while the larger wavenumber components are dominant for (d).