A summary of the broadscale tropical circulation from May to October 1990 in the area 40°N-40°S, 70°E-180° is presented. The circulation exhibited features typical of a quiescent phase of the Southern Oscillation: no major widespread anomalies were noted. Subtropical ridges in both hemispheres were near their normal positions and strength, the northwest Pacific ridge being slightly stronger than normal. In the northwest Pacific the monsoon was slightly enhanced and tropical cyclone activity was a little above normal, particularly in the latter half of the season. The south Asian monsoon was near normal development, with no consistent broadscale anomaly patterns.
Bate et al. (Wed,) studied this question.
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