| 热带扰动在大尺度经圈中的行为 |
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| 引用本文： | 巢纪平,徐昭.热带扰动在大尺度经圈中的行为[J].地球物理学报,2008,51(6):1657-1662. |
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| 作者姓名： | 巢纪平 徐昭 |
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| 作者单位： | 1.国家海洋局海洋环境科学和数值模拟国家海洋局重点实验室, 青岛 266061;2.国家海洋局海洋环境预报中心, 北京 100081;3.中国海洋大学物理海洋实验室, 青岛 266100 |
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| 基金项目： | 国家基础研究规划项目
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高等学校创新引智计划
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国际科技合作计划项目
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| 摘 要： | 在赤道β平面上经圈流的背景流场内，利用等值浅水模式来分析波动的不稳定性.结果显示，在经圈半地转假设下，扰动信号通过变性的Rossby波来传递.对于大洋西部，由于向极地方向经圈流的引入，赤道对称的扰动模态对所有的波数k都是不稳定的.对于大洋东部的向赤道流，对赤道对称的扰动却是稳定的.由于一般来讲，扰动倾向于对赤道对称，因此西边界的向极流，如黑潮，比东边界的向赤道流，如加尼福尼亚洋流，更易因扰动的不稳定而产生涡旋.
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| 关 键 词： | 经圈流 变性Rossby波 不稳定 |
| 收稿时间： | 2008-5-7 |
| 修稿时间： | 2008-7-31 |
The behavior of tropical disturbance in large-scale meridional flow |
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| CHAO Ji-Ping,XU Zhao.The behavior of tropical disturbance in large-scale meridional flow[J].Chinese Journal of Geophysics,2008,51(6):1657-1662. |
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| Authors: | CHAO Ji-Ping XU Zhao |
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| Institution: | 1.Key Laboratory of Environment Science and Numerical Simulation, State Oceanic Administration, Qingdao 266061, China;2.National Marine Environmental Forecasting Center, Beijing 100081,China;3.Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100,China |
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| Abstract: | In the meridional flow on the equatorial β plane，the instability is investigated with an equivalent shallow water model. Under the hypothesis of meridional semi-geostrophy, the disturbance signals propagate in metamorphic Rossby wave. In the polar-ward meridional flow on the west side of the ocean, the disturbance, which is symmetric to the equator, is unstable for any given wave number k. In the equator-ward meridional flow on the east side of the ocean, the disturbance symmetric to the equator is stable. Generally, the disturbance is usually symmetric to the equator. Therefore the polar-ward flow, such as Kuroshio, is easier to generate eddies due to the instability of disturbance than the equator-ward flow such as California current. |
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| Keywords: | Meridional flow Metamorphic Rossby wave Instability |
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