Deep Mesoscale and Submesoscale Circulations Around the Atlantis II Seamount

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
Matthew McKinley, Daoxun Sun, Mark Kelly, Karim G. Sabra, Annalisa Bracco
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Abstract

This study investigates the complex interactions between the North Atlantic Current (NAC) and the New England Seamount chain, focusing on the Atlantis II seamount. Employing a high-resolution submesoscale permitting regional ocean circulation model nested within a basin-wide simulation, it explores three distinct periods, each 2 weeks long, showcasing varied deep mesoscale and submesoscale circulations around the seamount. The analysis includes Eulerian statistics and Lagrangian particle tracing experiments to explore the transport and mixing impacts of the highly dynamic flow around the seamount. The results reveal significant density variations across the water column, attributed to the seamount's influence on local ocean currents. Specifically, mesoscale and submesoscale vortices, a seamount wake, and lee waves form during periods of increased near-bottom current flow. These findings highlight the critical role of topographic features in modulating oceanic flows and ocean mixing, which have implications, among others, for nutrient distribution, acoustic propagation, and climate modeling. The variety and variability of the mesoscale and submesoscale circulations that arise in response to the variability in the NAC strength and position in relation to the New England Seamount Chain demonstrate the difficulty in extrapolating general behaviors from isolated observational campaigns.

Abstract Image

亚特兰蒂斯 II 海隆周围的深层中尺度和次中尺度环流
这项研究调查了北大西洋洋流(NAC)与新英格兰海山链之间复杂的相互作用,重点是亚特兰蒂斯二号海山。该研究利用嵌套在全海盆模拟中的高分辨率次中尺度许可区域海洋环流模式,探索了三个不同时期,每个时期长达两周,展示了海山周围不同的深层中尺度和次中尺度环流。分析包括欧拉统计和拉格朗日粒子追踪实验,以探索海山周围高度动态流动的传输和混合影响。结果表明,由于海山对当地洋流的影响,整个水体的密度变化很大。具体来说,在近底洋流增加期间,会形成中尺度和次中尺度涡旋、海山尾流和利波。这些发现凸显了地形特征在调节洋流和海洋混合中的关键作用,对营养物质分布、声波传播和气候建模等都有影响。与新英格兰海山链相关的 NAC 强度和位置的变化所引起的中尺度和次中尺度环流的多样性和可变性表明,很难从孤立的观测活动中推断出一般行为。
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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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