Combination Mode Dynamics of the Anomalous Northwest Pacific Anticyclone
Combination Mode Dynamics of the Anomalous Northwest Pacific Anticyclone
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DOI：
10.1175/jcli-d-14-00225.1
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发表时间：
2015-02
影响因子：
4.9
通讯作者：
M. Stuecker;F. Jin;A. Timmermann;S. McGregor
中科院分区：
文献类型：
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作者：
M. Stuecker;F. Jin;A. Timmermann;S. McGregor
ENSO与西太平洋暖池年循环的非线性相互作用产生了一种大气风变率的组合模态（C模态）。作者指出，C型动力是厄尔尼诺事件期间异常低层西北太平洋反气旋（NWP-AC）发展的原因。西北太平洋环流嵌入在一个大尺度的非对称印度洋-太平洋大气环流响应中，并已被证明对亚洲的降水有很大的影响。与以前的研究相比，作者发现印度洋和西北太平洋的海气耦合作用对西北太平洋-南极洲的成因仅具有次要意义。此外，NWP-AC在频率域上具有明显的近年度组合音调，这在以前的印度-太平洋气候研究中被忽略了。此外，作者还假设了一个正反馈环，涉及异常低层西北太平洋-AC通过厄尔尼诺和C型相互作用：发展的发展。
AbstractNonlinear interactions between ENSO and the western Pacific warm pool annual cycle generate an atmospheric combination mode (C-mode) of wind variability. The authors demonstrate that C-mode dynamics are responsible for the development of an anomalous low-level northwest Pacific anticyclone (NWP-AC) during El Nino events. The NWP-AC is embedded in a large-scale meridionally antisymmetric Indo-Pacific atmospheric circulation response and has been shown to exhibit large impacts on precipitation in Asia. In contrast to previous studies, the authors find the role of air–sea coupling in the Indian Ocean and northwestern Pacific only of secondary importance for the NWP-AC genesis. Moreover, the NWP-AC is clearly marked in the frequency domain with near-annual combination tones, which have been overlooked in previous Indo-Pacific climate studies. Furthermore, the authors hypothesize a positive feedback loop involving the anomalous low-level NWP-AC through El Nino and C-mode interactions: the development o...