A coupled-stability index for ENSO
A coupled-stability index for ENSO
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DOI：
10.1029/2006gl027221
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发表时间：
2006-12-14
影响因子：
5.2
通讯作者：
Bejarano, Luis
中科院分区：
文献类型：
--
作者：
Jin, Fei-Fei;Kim, Seon Tae;Bejarano, Luis
本文基于厄尔尼诺-南方涛动（ENSO）补给振子的简单框架，描述了赤道太平洋地区大尺度热带海洋-大气相互作用耦合稳定性指数的建立。该指数称为Bjerknes （BJ）稳定性指数，其负贡献来自平均上升流和热阻尼，正贡献来自温跃层、纬向平流和Ekman反馈。通过对一个中耦合模式的特征分析，验证了BJ稳定性指数公式的有效性，结果表明，BJ稳定性指数反映了主导耦合类enso模式的增长率对不同气候条件的依赖关系。BJ稳定性指数的一般公式可用于评价ENSO的耦合稳定性及其对热带气候条件变化的敏感性。
Based on the simple framework of the recharge oscillator for El Nino-Southern Oscillation (ENSO), this paper describes the formulation of a coupled stability index for the large-scale tropical ocean-atmosphere interactions in the equatorial Pacific region. This index, referred to as the Bjerknes (BJ) stability index, takes its negative contributions from the mean upwelling and thermal damping and its positive contributions from the thermocline, the zonal advection, and the Ekman feedbacks. The validity of the BJ stability index formula is tested through a detailed eigen-analysis of an intermediate-coupled model, which shows that the BJ stability index captures the dependence of growth rate of the leading coupled ENSO-like mode on various climate conditions. The general formula of the BJ stability index may be useful for assessing the coupled stability of ENSO and its sensitivity to changes in tropical climate conditions.