A relationship between timing of El Niño onset and subsequent evolution
A relationship between timing of El Niño onset and subsequent evolution
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DOI：
10.1029/2003gl019239
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发表时间：
2004-03
影响因子：
5.2
通讯作者：
T. Horii;K. Hanawa
中科院分区：
文献类型：
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作者：
T. Horii;K. Hanawa
利用1871年至2000年130年的长时间序列资料，分析了厄尔尼诺现象发生的时间与后续演变的关系。结果表明，厄尔尼诺事件主要有两种类型：一种是4-6月(春季)；另一种是7-10月(夏秋季)。本文将厄尔尼诺事件的持续时间定义为厄尔尼诺-3.4指数的5个月移动平均距平超过0.5°C的时段，从而识别出24次厄尔尼诺事件，并将其划分为10个春季类型事件和14个夏秋季类型事件。总体而言，春季类型的事件规模较大，并在北方冬季前后进入成熟期，演化相对规律。相反，夏秋型地震的震级相对较弱，且具有相当不规则的特征。
A relationship between the timing of El Niño onset and the subsequent evolution is examined, using 130‐year long time series of Niño‐3.4 index from 1871 to 2000. It is found that El Niño 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 Niño is defined as the period when the 5‐month running mean anomaly of Niño‐3.4 index is exceeding 0.5°C. As a result, 24 El Niño 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.