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Nature 461, 481-484 (24 September 2009) | doi:10.1038/461481a; Published online 23 September 2009

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Climate change: The El Niño with a difference

Karumuri Ashok1 & Toshio Yamagata2

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Patterns of sea-surface warming and cooling in the tropical Pacific seem to be changing, as do the associated atmospheric effects. Increased global warming is implicated in these shifts in El Niño phenomena.

Through the El Niño events1, 2 that occur every 3–8 years or so, the state of the tropical Pacific Ocean and overlying atmosphere has global effects on climate — sometimes with devastating effects, for example on agriculture in India. El Niños are defined by warmer than normal sea surface temperatures in the eastern tropical Pacific, and are associated with anomalous atmospheric circulation patterns known as the Southern Oscillation.

  1. Karumuri Ashok is at the APEC Climate Center, 1463 U-dong, Haeundae-gu, Busan 612-020, Republic of Korea.
    Email: ashok@apcc21.net (Email: karumuriashok@hotmail.com)
  2. Toshio Yamagata is at the Application Laboratory, JAMSTEC, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan.
    Email: yamagata@jamstec.go.jp

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