A snapshot of turbulence in the Northeastern Magellan Strait

IF 2.2 3区 地球科学 Q2 OCEANOGRAPHY Ocean Dynamics Pub Date : 2024-05-09 DOI:10.1007/s10236-024-01613-y
Iossif Lozovatsky, Cristian Escauriaza, Leandro Suarez, Harindra J. S. Fernando, Megan Williams, Ronald Scott Coppersmith, Nicolas Mayorga
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Abstract

First-ever measurements of the turbulent kinetic energy (TKE) dissipation rate in the northeastern Strait of Magellan (Segunda Angostura region) taken in March 2019 are reported here. At the time of microstructure measurements, the magnitude of the reversing tidal current ranged between 0.8 and 1.2 ms−1. The probability distribution of the TKE dissipation rate in the water interior above the bottom boundary layer was lognormal with a high median value \({\varepsilon }_{med}^{MS}=1.2\times {10}^{-6}\) Wkg−1. Strong vertical shear, \(\left(1-2\right)\times {10}^{-2}\) s−1, in the weakly stratified water interior ensued a sub-critical gradient Richardson number \(Ri<{10}^{-1}-{10}^{-2}\). In the bottom boundary layer (BBL), the vertical shear and the TKE dissipation rate both decreased exponentially with the distance from the seafloor \(\xi\), leading to a turbulent regime with an eddy viscosity \({K}_{M}\sim {10}^{-3}\) m2/s, which varied with time and location, while being independent of the vertical coordinate in the upper part of BBL (for \(\xi >\sim 2\) meters above the bottom).

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麦哲伦海峡东北部湍流快照
本文报告了 2019 年 3 月在麦哲伦海峡东北部(Segunda Angostura 地区)首次测量的湍流动能(TKE)耗散率。在进行微结构测量时,逆转潮流的幅度在 0.8 至 1.2 ms-1 之间。底部边界层上方水体内部的 TKE 消散率的概率分布呈对数正态分布,中值较高({\varepsilon }_{med}^{MS}=1.2/times {10}^{-6})Wkg-1。在弱分层的水体内部,强烈的垂直剪切力(((left(1-2\right)\times {10}^{-2}\)s-1)导致了亚临界梯度理查森数((Ri<{10}^{-1}-{10}^{-2}\)。在底部边界层(BBL)中,垂直切变和 TKE 消散率都随着与海底距离的增加而呈指数下降,从而导致湍流系统的涡流粘度({K}_{M}\sim {10}^{-3}\) m2/s)随时间和位置变化,而与 BBL 上部的垂直坐标无关(对于 \(\xi >;\米)。
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来源期刊
Ocean Dynamics
Ocean Dynamics 地学-海洋学
CiteScore
5.40
自引率
0.00%
发文量
37
审稿时长
6-12 weeks
期刊介绍: Ocean Dynamics is an international journal that aims to publish high-quality peer-reviewed articles in the following areas of research: Theoretical oceanography (new theoretical concepts that further system understanding with a strong view to applicability for operational or monitoring purposes); Computational oceanography (all aspects of ocean modeling and data analysis); Observational oceanography (new techniques or systematic approaches in measuring oceanic variables, including all aspects of monitoring the state of the ocean); Articles with an interdisciplinary character that encompass research in the fields of biological, chemical and physical oceanography are especially encouraged.
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