What question did this study set out to answer?

This analysis aims to summarize the tropical circulation patterns in the Australian/Asian region during late 1990 to early 1991.

February 5, 2026

The tropical circulation in the Australian/Asian region - November 1990 to April 1991

Key Points

This analysis aims to summarize the tropical circulation patterns in the Australian/Asian region during late 1990 to early 1991.
Analyzed tropical circulation data from 70°E to the date-line
Monitored rainfall and monsoon strength
Examined cyclone activity and Hadley circulation
Stronger than normal northwest summer monsoon increased rainfall in northern Australia
Weaker than normal northeast winter monsoon led to reduced rainfall in Southeast Asia
Tropical weather activity was more pronounced north of the equator and less active south of it
The Hadley circulation was anomalously weak during this period
Fewer cyclogenesis events occurred in the southwest Pacific than usual.

Abstract

A summary of the tropical circulation from 70°E to the date-line, for November 1990 to April 1991, is presented. The Southern Oscillation did not exert any notable influence during this period. The Australian northwest summer monsoon was stronger than normal, resulting in above average rainfall over northern Australia. The Asian northeast winter monsoon was weaker than normal, resulting in below average rainfall across South-East Asia. In the western Pacific, tropical weather was more (less) active than normal north (south) of the equator. Associated with this, the Hadley circulation was anomalously weak in that region, and fewer cyclogenesis events than normal occurred in the southwest Pacific.

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