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首页> 外文期刊>Journal of Physical Oceanography >Baroclinic Modes in a Two-Layer Basin
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Baroclinic Modes in a Two-Layer Basin

机译：两层盆地的斜斜模式

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摘要

The objective of this study is to investigate the time-dependent circulation in a closed basin where the steady circulation is included and long Rossby wave speeds are consistent with observations. Specifically, the large-scale baroclinic eigenmodes of a two-layer rectangular basin forced by surface wind stress in the limit of small dissipation are examined. Low-frequency modes with small decay rates independent of friction result when the constraint of mass conservation is enforced. The magnitude of the wind stress is found to be critical to the eigenspectrum. For all forcing magnitudes, including forcings with closed geostrophic contours, oscillatory modes with decay rates independent of friction emerge. For forcings with closed geostrophic contours, two important classes of eigenmodes with comparable decay rates emerge: purely decaying modes confined to the region of closed contours, and basin-scale oscillatory modes. The purely decaying modes also exist without the constraint of total mass conservation but their decay rates depend on the magnitude of friction to leading order.
机译：这项研究的目的是研究一个封闭盆地中随时间变化的环流，其中包括稳定环流，长的罗斯比波速与观测值一致。具体来说，研究了在较小耗散的范围内受表面风应力作用的两层矩形盆地的大斜斜本征模。当强制执行质量守恒约束时，会产生衰减速率较小，与摩擦无关的低频模式。发现风应力的大小对本征光谱至关重要。对于所有强迫大小，包括具有封闭的地转等高线的强迫，都会出现具有与摩擦无关的衰减率的振荡模式。对于具有封闭地转等值线的强迫，出现了两类重要的本征模态，它们具有可比的衰减速率：仅限于封闭等值线区域的纯衰减模态和盆地尺度的振荡模态。纯衰减模式也存在，没有总质量守恒的约束，但是它们的衰减率取决于与前导摩擦的大小。

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