Effect of seamounts and seamount chains on ocean circulation and thermohaline structure
Effect of seamounts and seamount chains on ocean circulation and thermohaline structure
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DOI：
10.1029/gm043p0335
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
G. I. Roden
中科院分区：
文献类型：
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作者：
G. I. Roden
根据最近的理论和观测结果，讨论了海山和海山链对洋流和温盐结构的影响。由流动-地形相互作用产生的流动模式是复杂的，并且发生在从局部到行星的尺度上。它们取决于各种参数，包括地球自转及其随纬度的变化、地层、基流结构、摩擦力以及海山的高度、形状、方向和间距。内波反射、潮汐放大、涡旋捕获、中尺度重力位高度扰动以及入射流的偏转和修改是已观察到的一些较明显的特征。在一些海山，底部强化泰勒柱和被困的温盐锋的建议。高度理想化的模型预计在初始状态下产生涡对，在中间状态下产生复杂的涡流-平均流和涡流-涡流相互作用，以及在最终状态下产生永久的流动偏转、涡流捕获和尾流。虽然简化模型预测了一些观测到的特征，但目前尚未充分了解实际形状的海山与随时间变化、空间不均匀的水流之间的相互作用动态。
Aspects of effects of seamounts and seamount chains on oceanic flow and thermohaline structure are discussed on the basis of recent theoretical and observational findings. The flow patterns resulting from the flow‐topography interaction are complex and occur on scales from local to planetary. They depend on a variety of parameters involving the rotation of the earth and its variation with latitude, stratification, structure of the basic flow, friction, and the height, shape, orientation, and spacing of the seamounts. Internal wave reflection, tidal amplification, eddy trapping, mesoscale geopotential height perturbations, and deflection and modification of the incident flow are some of the more conspicuous features that have been observed. On some seamounts, bottom intensified Taylor columns and trapped thermohaline fronts are suggested. Highly idealized models anticipate vortex pair generation in the initial state, complex eddy‐mean flow and eddy‐eddy interaction in the intermediate state, and permanent flow deflection, eddy trapping, and wake generation in the final state. While the simplified models anticipate some of the observed features, the dynamics of interaction between realistically shaped seamounts and time varying, spatially nonuniform flow are not fully understood at present.