海山宽度调控下近惯性内波的产生与耗散

王文博; 谢晓辉

doi:10.3969/j.issn.1001-909X.2025.02.002

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海洋学研究 ›› 2025, Vol. 43 ›› Issue (2) : 11-18. DOI: 10.3969/j.issn.1001-909X.2025.02.002

研究论文

海山宽度调控下近惯性内波的产生与耗散

王文博 ¹ ,
谢晓辉 ¹^,²^,³^,^*

作者信息 +

Generation and dissipation of near-inertial internal waves under the regulation of seamount width

WANG Wenbo ¹ ,
XIE Xiaohui ¹^,²^,³^,^*

Author information +

文章历史 +

摘要

深海中地转流与海山相互作用可激发产生近惯性内波,该内波强度与海山高度相关,与海山宽度的关系尚不明确。本文采用二维MITgcm非静力数值模型探究了地转流与深海海山的相互作用以及海山宽度对近惯性内波产生与耗散的影响。结果表明,地形强迫在海山背流面顶部边缘产生强非线性波-波相互作用,产生近惯性内波并得到发展,使得能量从地转流向近惯性内波传递;在海山高度不变的条件下,海山宽度越小,近惯性内波的强度越大,发展和衰减更快;相较海山的迎流面,背流面的近惯性内波的垂直切变更强,产生的湍流耗散更强。因此,除了海山高度,海山宽度也是调控近惯性内波生成和演化的关键因素。

Abstract

The interaction between deep-ocean geostrophic current and seamounts can generate near-inertial internal waves (NIWs). While the intensity of these waves relates to the seamount height, its dependence on seamount width remains elusive. This study employs a two-dimensional, non-hydrostatic numerical model based on MITgcm to investigate the interaction of geostrophic current with deep-sea seamounts and examine how differing seamount widths influence the generation and dissipation of NIWs. Our results demonstrate that topographic forcing triggers robust nonlinear wave-wave interactions along the summit edges on the downstream flank of the seamount. This process generates energetic near-inertial internal waves that radiate away and develop, facilitating energy transfer from the geostrophic mean flow to the NIWs. For a fixed seamount height, narrower seamounts induce stronger near-inertial waves, characterized by more rapid wave development and decay. Moreover, the downstream flank exhibits significantly enhanced vertical shears within the near-inertial internal waves, driving greater turbulent dissipation compared to the upstream flank. Therefore, our findings highlight that, in addition to seamount height, seamount width is also a critical factor governing the generation and subsequent evolution of near-inertial internal waves.

导出引用

王文博, 谢晓辉. 海山宽度调控下近惯性内波的产生与耗散[J]. 海洋学研究. 2025, 43(2): 11-18 https://doi.org/10.3969/j.issn.1001-909X.2025.02.002

WANG Wenbo, XIE Xiaohui. Generation and dissipation of near-inertial internal waves under the regulation of seamount width[J]. Journal of Marine Sciences. 2025, 43(2): 11-18 https://doi.org/10.3969/j.issn.1001-909X.2025.02.002

中图分类号： P731.24

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