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The relationship of the El Nino conditions and the Southern Oscillation pattern (The Walker Circulation). A high pressure over the Pacific Ocean and low pressure over the East Indies causes heavy rainfall across the Pacific, rise in the sea level and increased surface temperatures.

[Journal of Atmospheric Sciences; v. 51, 1115; 1994]. [Science; v. 264, 72-74; 1994.]

Source: Atmospheric Chemistry Glossary