What question did this study set out to answer?

To summarize the tropical circulation patterns in the Australian/Asian region during a specific period influenced by ENSO conditions.

February 5, 2026

The tropical circulation in the Australian/Asian region - November 1997 to April 1998

Key Points

To summarize the tropical circulation patterns in the Australian/Asian region during a specific period influenced by ENSO conditions.
Overview of broadscale tropical circulation from 70°E to 180°
Analysis of atmospheric pressure and convection levels over six months
Consideration of tropical cyclone occurrences in the South Pacific
Warm-ENSO conditions persisted, reflected by atmospheric pressure and convection anomalies
Southern Oscillation Index values were very low, indicating strong ENSO effects
Higher than average tropical cyclone numbers in the South Pacific observed during the period
Indications of the potential end of ENSO conditions were noted
Intraseasonal oscillations with about 30-day periods were identified.

Abstract

A summary of the broadscale tropical circulation from 70°E to 180°, for the six months November 1997 to April 1998, is presented. Warm-ENSO conditions that developed earlier in 1997 persisted during this period. Evidence for this included above average atmospheric pressure and below average convection over most of the region, and very low values of the Southern Oscillation Index. Tropical cyclone numbers in the South Pacific were also much higher than the long-term mean. By the end of the summary period there were indications of the likely demise of the event. Intraseasonal oscillations with an average period of about 30 days were noted.

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