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首页> 外文期刊>Journal of Physical Oceanography >Pacific Abyssal Transport and Mixing: Through the Samoan Passage versus around the Manihiki Plateau
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Pacific Abyssal Transport and Mixing: Through the Samoan Passage versus around the Manihiki Plateau

机译：太平洋深渊运输和混合：通过萨摩亚通道与Manihiki高原周围

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The main source feeding the abyssal circulation of the North Pacific is the deep, northward flow of 5-6 Sverdrups (Sv; 1 Sv equivalent to 10(6) m(3) s(-1)) through the Samoan Passage. A recent field campaign has shown that this flow is hydraulically controlled and that it experiences hydraulic jumps accompanied by strong mixing and dissipation concentrated near several deep sills. By our estimates, the diapycnal density flux associated with this mixing is considerably larger than the diapycnal flux across a typical isopycnal surface extending over the abyssal North Pacific. According to historical hydrographic observations, a second source of abyssal water for the North Pacific is 2.3-2.8 Sv of the dense flow that is diverted around the Manihiki Plateau to the east, bypassing the Samoan Passage. This bypass flow is not confined to a channel and is therefore less likely to experience the strong mixing that is associated with hydraulic transitions. The partitioning of flux between the two branches of the deep flow could therefore be relevant to the distribution of Pacific abyssal mixing. To gain insight into the factors that control the partitioning between these two branches, we develop an abyssal and equator-proximal extension of the "island rule." Novel features include provisions for the presence of hydraulic jumps as well as identification of an appropriate integration circuit for an abyssal layer to the east of the island. Evaluation of the corresponding circulation integral leads to a prediction of 0.4-2.4 Sv of bypass flow. The circulation integral clearly identifies dissipation and frictional drag effects within the Samoan Passage as crucial elements in partitioning the flow.
机译：供给北太平洋深渊循环的主要来源是通过萨摩亚通道向北流的5-6个Sverdrups（Sv; 1 Sv相当于10（6）m（3）s（-1））。最近的野外运动表明，这种流动是液压控制的，并且经历了水力跳跃，伴随着强烈的混合和消散，集中在几个深坎s处。根据我们的估计，与这种混合有关的密度密度通量比横跨深海北太平洋的典型等密度面的密度通量要大得多。根据历史上的水文观测，北太平洋的第二个深海水源是绕过萨摩亚通道的东至Manihiki高原周围的稠密水流的2.3-2.8 Sv。该旁通流不限于通道，因此不太可能经历与液压过渡相关的强烈混合。因此，深流的两个分支之间的通量分配可能与太平洋深海混合的分布有关。为了深入了解控制这两个分支之间分配的因素，我们开发了“孤岛规则”的深渊和赤道近邻扩展。新颖的功能包括提供水力跳跃的条件以及确定合适的跳水的方法。岛屿东部的深渊层的集成电路。评估相应的循环积分可得出旁路流量为0.4-2.4 Sv的预测。循环积分清楚地表明，萨摩亚通道内的耗散和摩擦阻力效应是分隔气流的关键因素。

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