FIG. 10: Time series of (a) stratospheric zonal winds and (b) anomalies averaged between Curacao (12 ° N), Barbados (13 ° Nand Trinidad (11 °N)). Values at 50 mb (30 mb) are shown by solid (dashed) curves. Units are in m s-1. Anomalies are calculated from the 1950-1990 base period monthly means.