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首页> 外文期刊>Journal of Physical Oceanography >Do Eddies Play a Role in the Momentum Balance of the Leeuwin Current?
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Do Eddies Play a Role in the Momentum Balance of the Leeuwin Current?

机译：涡流在吕氏流的动量平衡中发挥作用吗？

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The Leeuwin Current is a poleward-flowing eastern boundary current off the western Australian coast, and alongshore momentum balance in the current has been hypothesized to comprise a southward pressure gradient force balanced by northward wind and bottom stresses. This alongshore momentum balance is revisited using a high-resolution upper-ocean climatology to determine the alongshore pressure gradient and altimeter and mooring observations to derive an eddy-induced Reynolds stress. Results show that north of the Abrolhos Islands (situated near the shelf break between 28.2° and 29.3°S), the alongshore momentum balance is between the pressure gradient and wind stress. South of the Abrolhos Islands, the Leeuwin Current is highly unstable and strong eddy kinetic energy is observed offshore of the current axis. The alongshore momentum balance on the offshore side of the current reveals an increased alongshore pressure gradient, weakened alongshore wind stress, and a significant Reynolds stress exerted by mesoscale eddies. The eddy Reynolds stress has a -0.5 Sv (Sv ≡ 10~6 m~3 s~(-1)) correction to the Indonesian Throughflow transport estimate from Godfrey's island rule. The mesoscale eddies draw energy from the mean current through mixed barotropic and baroclinic instability, and the pressure gradient work overcomes the negative wind work to supply energy for the instability process. Hence the anomalous large-scale pressure gradient in the eastern Indian Ocean drives the strongest eddy kinetic energy level among all the midlatitude eastern boundary currents.
机译：Leeuwin洋流是西澳大利亚海岸外向东流动的极向流，并且假设该洋流的沿岸动量平衡包括由北风和海底应力平衡的南向压力梯度力。使用高分辨率的上层海洋气候学来重新确定沿海动量平衡，以确定沿海压力梯度和高度计以及系泊观测值，以得出涡旋引起的雷诺应力。结果表明，在阿伯罗霍斯群岛以北（位于架子断裂附近，介于28.2°和29.3°S之间），沿海动量平衡在压力梯度和风应力之间。在Abrolhos群岛以南，Leeuwin洋流高度不稳定，并且在洋流轴外观察到强烈的涡动能。洋流近海侧的沿岸动量平衡表明，沿岸压力梯度增大，沿岸风应力减弱，并且中尺度涡流施加了很大的雷诺应力。涡流雷诺应力对Godfrey岛法则的印尼流量估算值具有-0.5 Sv（Sv≡10〜6 m〜3 s〜（-1））的校正。中尺度涡流通过正压和斜压混合不稳定性从平均电流中吸收能量，而压力梯度功克服了负风功，从而为不稳定性过程提供能量。因此，在所有中纬度东部边界流中，印度洋东部的异常大尺度压力梯度驱动了最强的涡动能级。

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