Cold Tongue Index

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A measure of the anomaly in sea-surface temperature in the central and eastern equatorial Pacific relative to the annual cycle. It is averaged over the area between 5° N and 5° S, and between the International Date Line and 90° W. It is anti-correlated with the Southern Oscillation Index. See also El Niño Southern Oscillation.

Subjects: Meteorology and Climatology.

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