The South Pacific Meridional Mode: A Mechanism for ENSO-like Variability
The South Pacific Meridional Mode: A Mechanism for ENSO-like Variability
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DOI：
10.1175/jcli-d-13-00082.1
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发表时间：
2014-01
影响因子：
4.9
通讯作者：
Honghai Zhang;A. Clement;P. D. Nezio
中科院分区：
文献类型：
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作者：
Honghai Zhang;A. Clement;P. D. Nezio
摘要：在这项研究中，作者在不同程度的大气与海洋耦合模型中研究了南太平洋大气变率与热带太平洋气候之间的联系。在气候模型实验的多模型集合中确定了一种稳健的变异模式，定义为南太平洋经向模式（SPMM），其中大气仅与板状海洋混合层热力学耦合。 SPMM 的物理解释几乎与北太平洋经向模式 (NPMM) 相同，赤道附近的东南信风变化改变了潜热通量和海面温度 (SST)，并启动风-蒸发-SST 反馈，将信号传播到热带地区。作者还表明，积极的云反馈在该模式的发展中发挥了作用，但这种效果取决于模型。虽然物理上与 NPMM 类似，但 SPMM 在赤道太平洋中的表达更强，并且直接...
AbstractIn this study, the authors investigate the connection between the South Pacific atmospheric variability and the tropical Pacific climate in models of different degrees of coupling between the atmosphere and ocean. A robust mode of variability, defined as the South Pacific meridional mode (SPMM), is identified in a multimodel ensemble of climate model experiments where the atmosphere is only thermodynamically coupled to a slab ocean mixed layer. The physical interpretation of the SPMM is nearly identical to the North Pacific meridional mode (NPMM) with the off-equatorial southeast trade wind variability altering the latent heat flux and sea surface temperature (SST) and initiating a wind–evaporation–SST feedback that propagates signals into the tropics. The authors also show that a positive cloud feedback plays a role in the development of this mode, but this effect is model dependent. While physically analogous to the NPMM, the SPMM has a stronger expression in the equatorial Pacific and directly ...