A Kuroshio Extension System Model Study: Decadal Chaotic Self-Sustained Oscillations
A Kuroshio Extension System Model Study: Decadal Chaotic Self-Sustained Oscillations
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DOI：
10.1175/jpo2931.1
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发表时间：
2006-08
影响因子：
3.5
通讯作者：
S. Pierini
中科院分区：
文献类型：
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作者：
S. Pierini
摘要 黑潮延伸系统的模型研究（其中强迫由与时间无关的气候风提供）产生了平均蜿蜒路径和急流的年代际变化，与现场和高度测量结果显着一致。在横跨整个北太平洋的盒子中实施了减重原始方程海洋模型，包括西侧的示意性海岸线，并根据 ECMWF 和综合海洋大气数据集 (COADS) 气候学确定了分析风强迫。模拟的时间平均黑潮延伸部分显示出曲流、北部和南部再循环区域以及急流穿透力，与相应观测到的气候特征非常吻合。这一结果表明，内在的非线性机制可能在确定平均流的曲折模式中发挥主要作用。内部低频变化被发现是一个混沌双峰自持振荡...
Abstract A model study of the Kuroshio Extension system, in which forcing is provided by a time-independent climatological wind, yields a mean meandering path and a decadal variability of the jet in significant agreement with in situ and altimetric measurements. A reduced-gravity primitive equation ocean model is implemented in a box spanning the whole North Pacific, including a schematic coastline at the western side, and an analytical wind forcing is determined according to the ECMWF and Comprehensive Ocean–Atmosphere Data Set (COADS) climatologies. The modeled time-averaged Kuroshio Extension shows meanders, northern and southern recirculation regions, and a jet penetration that are in good agreement with the corresponding observed climatological features. This result suggests that intrinsic nonlinear mechanisms are likely to play a major role in determining the meander pattern of the mean flow. The internal low-frequency variability is found to be a chaotic bimodal self-sustained oscillation between a...