A Coupled GCM Analysis of MJO Activity at the Onset of El Niño
A Coupled GCM Analysis of MJO Activity at the Onset of El Niño
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DOI：
10.1175/2008jas2855.1
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发表时间：
2009-04
影响因子：
3.1
通讯作者：
A. Marshall;O. Alves;H. Hendon
中科院分区：
文献类型：
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作者：
A. Marshall;O. Alves;H. Hendon
摘要 使用澳大利亚气象局的通量校正耦合模型实验评估了马登-朱利安振荡 (MJO) 的海洋动力学及其与厄尔尼诺-南方涛动 (ENSO) 的相互作用。该模型展示了西太平洋 MJO 相关西风的正确海洋开尔文波响应。虽然MJO可能对厄尔尼诺强度有影响，但其影响很难与ENSO强热含量预处理的影响分开。因此，MJO-ENSO关系是从西太平洋低热含量异常的背景状态开始评估的，这也是最近观测到的厄尔尼诺事件的特征。该模型显示，厄尔尼诺峰值附近的 ENSO 与 MJO 之间存在密切关系。此时，太平洋中部海表温度（SST）异常最大，且难以区分因果关系。然而，在厄尔尼诺现象临近时，太平洋海温异常...
Abstract The ocean dynamics of the Madden–Julian oscillation (MJO) and its interaction with El Nino–Southern Oscillation (ENSO) are assessed using a flux-corrected coupled model experiment from the Australian Bureau of Meteorology. The model demonstrates the correct oceanic Kelvin wave response to the MJO-related westerly winds in the western Pacific. Although there may be a role for the MJO in influencing the strength of El Nino, its impact is difficult to separate from that of strong heat content preconditioning of ENSO. Hence, the MJO–ENSO relationship is assessed starting from a background state of low heat content anomalies in the western Pacific that are also characteristic of recent observed El Nino events. The model shows a strong relationship between ENSO and the MJO near the peak of El Nino. At this time, the sea surface temperature (SST) anomaly is largest in the central Pacific, and it is difficult to separate cause and effect. Near the onset of El Nino, however, when Pacific Ocean SST anomali...