Earth and the Environment

When was El Niño first observed?

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The effects of El Niño were documented in Peru as early as the Spanish conquest in 1525. By the end of the 19th cent. the phenomenon was being studied by Peruvian oceanographers, although the effects were thought to be limited to the W coast of South America. It was not until the systematic studies of the International Geophysical Year of 1957-58 that the extent of the meteorological impact of El Niño was recognized.

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Get more facts and information about El Niño-Southern Oscillation . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

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