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Detailed Reference Information |
Horii, T. and Hanawa, K. (2004). A relationship between timing of El Niño onset and subsequent evolution. Geophysical Research Letters 31: doi: 10.1029/2003GL019239. issn: 0094-8276. |
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A relationship between the timing of El Ni¿o onset and the subsequent evolution is examined, using 130-year long time series of Ni¿o-3.4 index from 1871 to 2000. It is found that El Ni¿o events can be classified into two major types: one is the onset of which is from April to June (spring type) and the other is from July to October (summer-fall type). Here, the duration of El Ni¿o is defined as the period when the 5-month running mean anomaly of Ni¿o-3.4 index is exceeding 0.5¿C. As a result, 24 El Ni¿o events are identified, and classified into 10 spring type events and 14 summer-fall type events. In general, spring type events grow greater in magnitude, and take the mature phase around a boreal winter and the evolution is relatively regular. On the contrary, summer-fall type events are relatively weaker in magnitude, and have rather irregular aspects. |
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Abstract |
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Keywords
Oceanography, Physical, El Nino, Oceanography, General, Equatorial oceanography, Oceanography, Physical, Air/sea interactions |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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