Tropical Pacific Decadal Variability and the Subtropical–Tropical Cells
Tropical Pacific Decadal Variability and the Subtropical–Tropical Cells
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DOI：
10.1175/jcli3559.1
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发表时间：
2005-12
影响因子：
4.9
通讯作者：
K. Lohmann;M. Latif
中科院分区：
文献类型：
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作者：
K. Lohmann;M. Latif
本文利用观测资料和数值模式模拟，分析了热带太平洋年代际尺度的变率。中西太平洋海表温度（SST）变化的两个主导模态是10年左右的年代际模态和4年左右的ENSO模态。年代际模态的海温距平型与ENSO型相似。年代际模，然而，解释了赤道西太平洋和赤道外的大部分变化。利用海洋环流模式（OGCM）的再分析资料，对10年尺度模态的起源进行了模拟。研究发现，副热带-热带浅层翻转环流的变化是驱动年代际模态的重要因素。这是支持从一个多世纪的集成与耦合的海洋大气环流模式（CGCM），现实地模拟热带太平洋年代际变化的结果。最后，讨论了页岩气的敏感性。
Abstract The decadal-scale variability in the tropical Pacific has been analyzed herein by means of observations and numerical model simulations. The two leading modes of the sea surface temperature (SST) variability in the central western Pacific are a decadal mode with a period of about 10 yr and the ENSO mode with a dominant period of about 4 yr. The SST anomaly pattern of the decadal mode is ENSO like. The decadal mode, however, explains most variance in the western equatorial Pacific and off the equator. A simulation with an ocean general circulation model (OGCM) forced by reanalysis data is used to explore the origin of the decadal mode. It is found that the variability of the shallow subtropical–tropical overturning cells is an important factor in driving the decadal mode. This is supported by results from a multicentury integration with a coupled ocean–atmosphere general circulation model (CGCM) that realistically simulates tropical Pacific decadal variability. Finally, the sensitivity of the shal...