What question did this study set out to answer?

To analyze the climate conditions and circulation patterns in the southern hemisphere during winter 1990, focusing on Australia.

February 5, 2026

Seasonal climate summary southern hemisphere (winter 1990): generally normal conditions in the tropics and warm in mid-latitudes

Key Points

To analyze the climate conditions and circulation patterns in the southern hemisphere during winter 1990, focusing on Australia.
Conducted a climate analysis from June to August 1990
Monitored sea-surface temperatures in the equatorial Pacific
Examined climate indices across the southern hemisphere
Winter sea-surface temperatures in the equatorial Pacific were generally near normal
Slightly above normal temperatures were noted in the western equatorial Pacific
Positive sea-surface temperature anomalies persisted in mid-latitudes, particularly across the Pacific

Abstract

A climate analysis is given of the southern hemisphere winter circulation, June to August 1990, with more detailed treatment of the Australian region. In the equatorial Pacific, winter sea-surface temperatures were mainly near normal, although slightly above normal in western areas. Other equatorial Pacific climate indices remained near normal. In mid-latitudes, sea-surface temperature anomalies continued positive, especially across the Pacific. A three-wave planetary pattern persisted with the oceanic troughs located in the eastern sectors of the oceans.

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