Two different features of discharge of equatorial upper ocean heat content related to El Nino events
Two different features of discharge of equatorial upper ocean heat content related to El Nino events
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DOI：
10.1029/2005gl024832
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发表时间：
2006-01-24
影响因子：
5.2
通讯作者：
Hanawa, K
中科院分区：
文献类型：
--
作者：
Hasegawa, T;Horii, T;Hanawa, K
[1]本文分析了热带太平洋的海洋和大气异常场，提取了近49年来12次厄尔尼诺事件的一些特征。结果表明，在7次ElNino事件（A型事件）的成熟阶段之后，整个赤道上层海洋热含量（Teq）都得到了释放，而在另外5次事件（B型事件）中，Teq都没有得到很好的释放。此外，A型事件通常比B型事件具有更大的热带海洋和大气异常幅度。此外，A类事件的持续时间比B类事件的持续时间长。在厄尔尼诺事件成熟阶段后，A型事件伴随着热带南太平洋较大的正风应力旋度异常和由此产生的向极Sverdrup输送，而B型事件则不伴随。这种大的正风应力异常的出现，可能是Teq在A型事件中释放良好的原因之一。
[1] Oceanic and atmospheric anomaly fields in the tropical Pacific are investigated to extract some characteristics from twelve El Nino events in the past 49 years. The results show that entire equatorial upper ocean heat content (Teq) is discharged after the mature phase of seven El Nino events (A-type events), while Teq is not well discharged in other five events (B-type events). Furthermore, A-type events generally have larger amplitudes of tropical oceanic and atmospheric anomalies than B-type events. In addition, the durations of A-type events are longer than those of B-type events. It is also found that A-type events accompany large positive wind stress curl anomaly and resultant poleward Sverdrup transport in the tropical South Pacific after the mature phase of El Nino events, while B-type events do not. This appearance of large positive wind stress anomaly should be one of the reasons why Teq is well discharged in A-type events.