Thermocline fluctuations in the equatorial Pacific related to the two types of El Niño events
Thermocline fluctuations in the equatorial Pacific related to the two types of El Niño events
复制标题
与两类厄尔尼诺事件相关的赤道太平洋温跃层波动
DOI：
10.1175/jcli-d-16-0291.1
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发表时间：
2017
影响因子：
4.9
通讯作者：
Riyu Lu
中科院分区：
文献类型：
--
作者：
Kang Xu;Rui Xin Huang;Weiqiang Wang;Congwen Zhu;Riyu Lu
赤道温跃层的年际波动通常与厄尔尼诺活动有关，但温跃层模态与厄尔尼诺的联系仍有争议。在本研究中，模态函数分解方法被应用到赤道太平洋温跃层，结果表明，前两个主导模式（M1和M2）识别赤道太平洋温跃层的两个不同的特征。M1反映了与东太平洋（EP）厄尔尼诺有关的海盆范围的纬向倾斜温跃层，西（东）赤道太平洋的变浅（加深）。M2代表中太平洋（CP）厄尔尼诺现象，其特征是赤道太平洋温跃层呈V形（即，在赤道太平洋中部较深，在西部和东部边界较浅）。此外，这两种模态在年际时间尺度上都是稳定而显著的，并表现为与两种类型厄尔尼诺相关的温跃层波动的主要特征。
AbstractThe interannual fluctuations of the equatorial thermocline are usually associated with El Nino activity, but the linkage between the thermocline modes and El Nino is still under debate. In the present study, a mode function decomposition method is applied to the equatorial Pacific thermocline, and the results show that the first two dominant modes (M1 and M2) identify two distinct characteristics of the equatorial Pacific thermocline. The M1 reflects a basinwide zonally tilted thermocline related to the eastern Pacific (EP) El Nino, with shoaling (deepening) in the western (eastern) equatorial Pacific. The M2 represents the central Pacific (CP) El Nino, characterized by a V-shaped equatorial Pacific thermocline (i.e., deep in the central equatorial Pacific and shallow on both the western and eastern boundaries). Furthermore, both modes are stable and significant on the interannual time scale, and manifest as the major feature of the thermocline fluctuations associated with the two types of El Nino...