Note on the beam structure in step-trapped internal tides

IF 2.8 2区地球科学 Q1 OCEANOGRAPHY

Journal of Physical Oceanography Pub Date : 2024-01-15 DOI:10.1175/jpo-d-23-0084.1

Paul A. Sanders, Martijn D. Dorrestijn, Theo Gerkema

引用次数: 0

Abstract

The along-slope propagation of sub-inertial trapped internal tides is studied for the configuration of a simple step. It is revealed that they form a beam structure in the along-slope direction that is evanescent above the top of the step; these beams lack strict periodicity in the along-slope direction. As in classical internal Kelvin waves, they become less sharp away from the step, as higher modes decay more rapidly in the cross-slope direction. We discuss implications for abyssal mixing and outline the necessary ingredients for their generation.

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阶跃型内潮中的横梁结构说明

针对一个简单台阶的构造，研究了亚惯性陷波内潮的沿坡传播。结果表明，它们在沿斜坡方向形成了一个波束结构，在台阶顶部上方呈蒸发状；这些波束在沿斜坡方向缺乏严格的周期性。与经典的内开尔文波一样，由于高模在横坡方向衰减得更快，它们在远离台阶的地方变得不那么尖锐。我们讨论了这些波束对深海混合的影响，并概述了产生这些波束的必要因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Physical Oceanography 地学-海洋学

CiteScore

2.40

自引率

20.00%

发文量

200

审稿时长

4.5 months

期刊介绍： The Journal of Physical Oceanography (JPO) (ISSN: 0022-3670; eISSN: 1520-0485) publishes research related to the physics of the ocean and to processes operating at its boundaries. Observational, theoretical, and modeling studies are all welcome, especially those that focus on elucidating specific physical processes. Papers that investigate interactions with other components of the Earth system (e.g., ocean–atmosphere, physical–biological, and physical–chemical interactions) as well as studies of other fluid systems (e.g., lakes and laboratory tanks) are also invited, as long as their focus is on understanding the ocean or its role in the Earth system.