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Contrasting the evolution between two types of El Nino in a data assimilation model

机译：在数据同化模型中对比两种厄尔尼诺现象的演变

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摘要

Simulation outputs were used to contrast the distinct evolution patterns between two types of El Nino. The modeled isotherm depth anomalies closely matched satellite sea surface height anomalies. Results for the El Nino Modoki (central Pacific El Nino) corresponded well with previous studies which suggested that thermocline variations in the equatorial Pacific contain an east-west oscillation. The eastern Pacific El Nino experienced an additional north-south seesaw oscillation between approximately 15° N and 15° S. The wind stress curl pattern over the west-central Pacific was responsible for the unusual manifestation of the eastern Pacific El Nino. The reason why the 1982/1983 El Nino was followed by a normal state whereas a La Nina phase developed from the 1997/1998 El Nino is also discussed. In 1997/1998, the Intertropical Convergence Zone (ITCZ) retreated faster and easterly trade winds appeared immediately after the mature El Nino, cooling the sea surface temperature in the equatorial Pacific and generating the La Nina event. The slow retreat of the ITCZ in 1982/1983 terminated the warm event at a much slower rate and ultimately resulted in a normal phase.
机译：模拟输出用于对比两种厄尔尼诺现象之间不同的进化模式。建模的等温线深度异常与卫星海面高度异常紧密匹配。 El Nino Modoki（太平洋中部El Nino）的结果与以前的研究非常吻合，后者表明赤道太平洋中的温跃层变化包含东西向振荡。太平洋东部的厄尔尼诺现象在大约15°N和15°S之间经历了另外的南北跷跷板振荡。太平洋中西部的风应力卷曲模式是东部太平洋的厄尔尼诺现象的不寻常表现。还讨论了为什么1982/1983 El Nino处于正常状态，而从1997/1998 El Nino发展为La Nina相的原因。在1997/1998年，热带气旋收敛区（ITCZ）退缩得更快，在厄尔尼诺现象成熟后立即出现了东风，从而冷却了赤道太平洋的海面温度并引发了拉尼娜事件。 ITCZ在1982/1983年的缓慢撤退以较慢的速度终止了暖事件，并最终进入了正常阶段。

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