湍流混合对安达曼海北部大陆坡上中间霓虹层形成的影响

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY
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引用次数: 0

摘要

中间胶凝层(INL)是颗粒物质(包括有机碳、生物养分和其他成岩矿物)跨坡迁移的重要通道。尽管有大量关于伊洛瓦底江沉积物大量流入安达曼海(AS)北部大陆坡的报道,但由于缺乏对斜坡上浑浊的 INL 的现场观测,人们对这些河运沉积物的迁移路线和最终归宿仍然知之甚少。在本研究中,我们提出了 2019/2020 年冬季安达曼海北部大陆坡上空出现 INL 的直接证据,同时伴随着中层水湍流混合的增强。系泊测量揭示了研究区域内具有高模垂直结构的高能内潮;并观测到内潮的梁状结构,这可能是中层水湍流混合与 INL 同时增强的原因。此外,现有的微观结构剖面图显示,研究区域内存在高能湍流混合,底部湍流扩散性增强。数值实验表明,湍流混合在大陆坡上的不均匀分布可能导致上涌输送向上坡方向的局部汇聚,造成从边界向内部的入侵,从而促进 INL 的形成。INL 的发现及其混合驱动的生成机制为了解 AS 北部大陆坡的沉积物输运动力学提供了新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of turbulent mixing on the formation of intermediate nepheloid layer over the northern continental slope of the Andaman sea

An intermediate nepheloid layer (INL) serves as an important conduit for the cross-slope transport of particulate matter, including organic carbon, biological nutrients and other lithogenic minerals. Despite extensive reports on the substantial sediment influx from the Ayeyarwady River into the northern continental slope of the Andaman Sea (AS), the transport route and fate of these river-borne sediments remain poorly understood, due to lack of in situ observations of turbid INL over the slope. In this study, we present direct evidence of an INL over the northern continental slope of the AS during the winter of 2019/2020, accompanied by enhanced mid-water turbulent mixing. Mooring measurements reveal energetic internal tides with high-mode vertical structure in the study region; and beam-like structures of internal tides are observed, which could be responsible for the enhanced mid-water turbulent mixing coinciding with the INL. Moreover, available microstructure profiles reveal energetic turbulent mixing with bottom-intensified turbulent diffusivity over the study area. Numerical experiments suggest that inhomogeneous distribution of turbulent mixing over the continental slope could induce local convergence of the upwelling transport in the upslope direction, resulting in an intrusion from the boundary to the interior and consequently promoting the INL formation. The discovery of the INL and its mixing-driven generation mechanism provide new insights into sediment transport dynamics over the northern continental slope of the AS.

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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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