Generation of Shoreward Nonlinear Internal Waves South of the Hainan Island: Synthetic Aperture Radar Observations and Numerical Simulations
Generation of Shoreward Nonlinear Internal Waves South of the Hainan Island: Synthetic Aperture Radar Observations and Numerical Simulations
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海南岛以南近岸非线性内波的产生：合成孔径雷达观测和数值模拟
DOI：
10.1029/2021jc017334
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发表时间：
2021-06
影响因子：
3.6
通讯作者：
Li Xiao-Ming
中科院分区：
文献类型：
--
作者：
Jia Tong;Liang Jianjun;Li Qiang;Sha Jin;Li Xiao-Ming
基于星载合成孔径雷达（SAR）观测和数值模拟，研究了海南岛以南大陆架向岸非线性内波（NLIWs）的产生。两种类型的近岸NLIWs被确定从SAR图像根据其不同的地理分布。其中一类NLIWs分布在SHI的北方，称为N型NLIWs;另一类NLIWs分布在SHI的南方，称为S型NLIWs。根据合成孔径雷达（SAR）观测到的大潮和小潮波浪发生频率，结合计算得到的体积力，认为N型NLIW主要来源于西沙群岛，而S型NLIW主要来源于西沙群岛和陆架坡折带，其中陆架坡折带的贡献较大。内潮射线路径、伽马参数和SAR最早观测到的NLIW的协同分析表明，N型NLIW是由西沙群岛发出的昼夜内潮束撞击靠近大陆架的近表层密度跃层造成的。基于真实的陆坡地形和潮汐强迫，利用MITgcm二维数值模拟结果表明，S型非线性低潮汐是由陆坡折裂处形成的低压所引起的1型日内潮的非线性分裂所导致的。数值实验表明，背景流对陆架坡折处内波的非线性演化有很大的影响。
The generation of shoreward nonlinear internal waves (NLIWs) on the continental shelf south of the Hainan Island (SHI) is investigated based on spaceborne synthetic aperture radar (SAR) observations and numerical simulations. Two types of shoreward NLIWs are identified from SAR images according to their distinct geographic distribution. One type of NLIWs, named Type-N NLIWs, is distributed in the northern part of SHI, and the other one is named Type-S NLIWs, distributed in the southern part of SHI. The SAR-observed wave occurrence frequency during the spring and neap tides, combined with the calculated body force, suggests that the Type-N NLIWs originate from the Xisha Islands, whereas the Type-S NLIWs originate from both the Xisha Islands and the continental shelf break, and the shelf break has a larger contribution. The synergistic analyses of the internal tidal ray path, gamma parameter and earliest SAR-observed NLIWs suggest that the Type-N NLIWs are caused by the impingement of the diurnal internal tidal beams emanating from the Xisha Islands on the near-surface pycnocline close to the continental shelf. Based on the realistic shelf-slope topography and tidal forcing, the two-dimensional numerical simulations using the MITgcm suggest that the Type-S NLIWs result from the nonlinear disintegration of a mode-1 diurnal internal tide, which develops from a depression formed .at the continental shelf break. Furthermore, numerical experiments show that the background current can greatly affect the nonlinear evolution of the internal waves generated at the shelf break.
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影响因子：
2.3
作者：
G. Carter;M. Gregg;R. Lien
通讯作者：
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南海西北正压潮和斜压潮的季节和空间特征
DOI：
10.1029/2018jc014860
发表时间：
2020
期刊：
Journal of Geophysical Research: Oceans
影响因子：
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DOI：
10.1002/2017jc013389
发表时间：
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期刊：
Journal of Geophysical Research:Oceans
影响因子：
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作者：
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通讯作者：
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影响因子：
13.5
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
L. Quaresma;J. Vitorino;Anabela Oliveira;José da Silva