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On the dynamics of strait flows: an ocean model study of the Aleutian passages and the Bering Strait

机译：关于海峡水流的动力学：阿留申海峡和白令海峡的海洋模型研究

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A high-resolution numerical ocean circulation model of the Bering Sea (BS) is used to study the natural variability of the BS straits. Three distinct categories of strait dynamics have been identified: (1) Shallow passages such as the Bering Strait and the Unimak Passage have northward, near barotropic flow with periodic pulses of larger transports; (2) wide passages such as Near Straits, Amukta Pass, and Buldir Pass have complex flow patterns driven by the passage of mesoscale eddies across the strait; and (3) deep passages such as Amchitka Pass and Kamchatka Strait have persistent deep return flows opposite in direction to major surface currents; the deep flows persist independent of the local wind. Empirical orthogonal function analyses reveal the spatial structure and the temporal variability of strait flows and demonstrate how mesoscale variations in the Aleutian passages influence the Bering Strait flow toward the Arctic Ocean. The study suggests a general relation between the barotropic and baroclinic Rossby radii of deformations in each strait, and the level of flow variability through the strait, independent of geographical location. The mesoscale variability in the BS seems to originate from two different sources: a remote origin from variability in the Alaskan Stream that enters the BS through the Aleutian passages and a local origin from the interaction of currents with the Bowers Ridge in the Aleutian Basin. Comparisons between the flow in the Aleutian passages and flow in other straits, such as the Yucatan Channel and the Faroe Bank Channel, suggest some universal topographically induced dynamics in strait flows.
机译：白令海（BS）的高分辨率数值海洋环流模型用于研究BS海峡的自然变异性。已经确定了三种不同的海峡动力学类型：（1）浅通道，如白令海峡和乌尼马克通道，具有北向，接近正压流动，并伴有较大运输的周期性脉冲； （2）近海峡，Amukta通行证和Buldir通行证之类的宽阔通道具有复杂的流动模式，这是由中尺度涡旋穿过海峡所驱动的； （3）Amchitka Pass和Kamchatka Strait之类的深通道具有持久的深回流，其方向与主要地表水流相反。深流持续存在，不受局部风的影响。经验正交函数分析揭示了海峡水流的空间结构和时间变化，并说明了阿留申海峡中尺度变化如何影响白令海峡向北冰洋的水流。研究表明，每个海峡的正压和斜压Rossby半径在每个海峡的变形之间，以及通过海峡的流量变化水平之间，与地理位置无关。 BS的中尺度变化似乎源于两个不同的来源：来自阿拉斯加河流域的可变性的遥远起源（通过阿留申河段进入BS）和来自洋流与阿留申盆地Bowers Ridge相互作用的局部起源。比较阿留申河道的流量和其他海峡的流量，例如尤卡坦河道和法罗河岸河道，发现海峡河道中有一些普遍的地形诱发动力学。

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