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首页> 外文期刊>Journal of Physical Oceanography >Energy Loss from Transient Eddies due to Lee Wave Generation in the Southern Ocean
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Energy Loss from Transient Eddies due to Lee Wave Generation in the Southern Ocean

机译：南大洋中产生李波的瞬时涡流造成的能量损失

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Observations suggest that enhanced turbulent dissipation and mixing over rough topography are modulated by the transient eddy field through the generation and breaking of lee waves in the Southern Ocean. Idealized simulations also suggest that lee waves are important in the energy pathway from eddies to turbulence. However, the energy loss from eddies due to lee wave generation remains poorly estimated. This study quantifies the relative energy loss from the time-mean and transient eddy flow in the Southern Ocean due to lee wave generation using an eddy-resolving global ocean model and three independent topographic datasets. The authors find that the energy loss from the transient eddy flow (0.12 TW; 1 TW = 10(12) W) is larger than that from the time-mean flow (0.04 TW) due to lee wave generation; lee wave generation makes a larger contribution (0.12 TW) to the energy loss from the transient eddy flow than the dissipation in turbulent bottom boundary layer (0.05 TW). This study also shows that the energy loss from the time-mean flow is regulated by the transient eddy flow, and energy loss from the transient eddy flow is sensitive to the representation of anisotropy in small-scale topography. It is implied that lee waves should be parameterized in eddy-resolving global ocean models to improve the energetics of resolved flow.
机译：观测结果表明，在南大洋中，瞬变涡流通过回风的产生和破坏来调节湍流的扩散和在粗糙地形上的混合。理想化的模拟还表明，在从涡流到湍流的能量路径中，风浪很重要。但是，由于回风的产生，涡流产生的能量损失仍然很难估计。这项研究使用解析涡旋的全球海洋模型和三个独立的地形数据集，量化了由于回风产生而导致的南洋时间平均和瞬态涡旋流相对能量损失。作者发现，由于回风的产生，瞬时涡流的能量损失（0.12 TW； 1 TW = 10（12）W）大于时间平均流的能量损失（0.04 TW）。与湍流底部边界层的耗散（0.05 TW）相比，lee波的产生对瞬态涡流造成的能量损失贡献更大（0.12 TW）。这项研究还表明，时均流的能量损失受瞬态涡流的调节，瞬态涡流的能量损耗对小规模地形中各向异性的表示很敏感。这暗示着应在解决涡流的全球海洋模型中对背风波进行参数化，以提高分辨流的能量。

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