Coupling Modes among Action Centers of Wave–Mean Flow Interaction and Their Association with the AO/NAM
Coupling Modes among Action Centers of Wave–Mean Flow Interaction and Their Association with the AO/NAM
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DOI：
10.1175/2011jcli4240.1
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发表时间：
2012-01
影响因子：
4.9
通讯作者：
N. Zhao;Sujie Liang;Yihui Ding
中科院分区：
文献类型：
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作者：
N. Zhao;Sujie Liang;Yihui Ding
摘要北极涛动/北半球环状模态（AO/NAM）是由北半球温带地区的波-平均流相互作用引起的。这种波均流相互作用与三个大气作用中心密切相关，分别对应三个区域振荡：NAO、PNA和平流层极涡（SPV）。因此，很自然地可以推断，这三个作用中心的局部波-平均流相互作用是相互动态耦合的，从而可以解释环形模态三维相干结构的主要方面，这也为理解局部AO - pna - spv视角和半球AO/NAM视角如何相互关联提供了一种可能的方法。利用耦合振子的线性随机模型，研究了PNA、NAO和SPV之间的两种耦合模式与AO海平面气压的二维分布有关。尽管两者都可能导致……
AbstractThe Arctic Oscillation/Northern Hemisphere annular mode (AO/NAM) is attributed to wave–mean flow interaction over the extratropical region of the Northern Hemisphere. This wave–mean flow interaction is closely related to three atmospheric centers of action, corresponding to three regional oscillations: the NAO, the PNA, and the stratosphere polar vortex (SPV), respectively. It is then natural to infer that local wave–mean flow interactions at these three centers of action are dynamically coupled to each other and can thus explain the main aspects of the three-dimensional coherent structure of the annular mode, which also provides a possible way to understand how the local NAO–PNA–SPV perspective and the hemispheric AO/NAM perspective are interrelated. By using a linear stochastic model of coupled oscillators, this study suggests that two coupling modes among the PNA, NAO, and SPV are related to the two-dimensional pattern in sea level pressure of the AO. Although both of them may contribute to the...