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Effects of westward shoaling pycnocline on characteristics and energetics of internal solitary wave in the Luzon Strait by numerical simulations

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Acta Oceanologica Sinica 2021年第5期40卷 20-29页

作者： Haibin Lli Yujun Liu Xiaokang Chen Guozhen Zha Shuqun Cai Jiangsu Key Laboratory of Marine Bioresources and Environment/Jiangsu Key Laboratory of Marine Biotechnology Jiangsu Ocean UniversityLianyungang 222005China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Jiangsu Institute of Marine Resources Development Lianyungang 222005China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China

An internal gravity wave model was employed to simulate the generation of internal solitary waves(ISWs)over a sill by tidal flows.A westward shoaling pycnocline parameterization scheme derived from a three-parameter model was adopted,and then 14 numerical experiments were designed to investigate the influence of the pycnocline thickness,density difference across the pycnocline,westward shoaling isopycnal slope angle and pycnocline depth on the *** the pycnocline thickness on both sides of the sill increases,the total barotropic kinetic energy,total baroclinic energy and ratio of baroclinic kinetic energy(KE)to available potential energy(APE)decrease,whilst the depth of isopycnal undergoing maximum displacement and ratio of baroclinic energy to barotropic energy *** the density difference on both sides of the sill decreases synchronously,the total barotropic kinetic energy,ratio of baroclinic energy to barotropic energy and total baroclinic energy decrease,whilst the depth of isopycnal undergoing maximum displacement *** the westward shoaling isopycnal slope angle increases,the total baroclinic energy increases whilst the depth of turning point almost remains *** the depth of westward shoaling pycnocline on both sides of the sill reduces,the ratio of baroclinic energy to barotropic energy and total baroclinic energy decrease,whilst the total barotropic kinetic energy and ratio of KE to APE *** one of the above four different influencing factors was increased by 10%while the other factors keep unchanged,the amplitude of the leading soliton in ISW Packet A was decreased by 2.80%,7.47%,3.21%and 6.42%*** density difference across the pycnocline and the pycnocline depth are the two most important factors in affecting the characteristics and energetics of ISWs.

关键词： internal solitary waves baroclinic energy South China Sea pycnocline

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引入强分层近似对含密度跃层情况下的大幅内孤立波计算误差研究

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哈尔滨工程大学学报（英文版） 2023年第1期22卷 146-152页

作者：许存国王战 Hayatdavoodi Masoud Qingdao Innovation and Development Center of Harbin Engineering University Qingdao 266555China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China Frontiers Science Center for Wave Field of Extreme Ocean Environment Harbin Engineering UniversityHarbin 150001China Civil Engineering Department School of Science and EngineeringUniversity of DundeeDundee DD14HNUK

At present,studies on large-amplitude internal solitary waves mostly adopt strong stratification models,such as the twoand three-layer Miyata–Choi–Camassa(MCC)internal wave models,which omit the pycnocline or treat it as another fluid layer with a constant *** the pycnocline exists in real oceans and cannot be omitted sometimes,the computational error of a large-amplitude internal solitary wave within the pycnocline introduced by the strong stratification approximation is *** this study,the two-and three-layer MCC internal wave models are used to calculate the wave profile and wave speed of large-amplitude internal solitary *** comparing these results with the results provided by the Dubreil–Jacotin–Long(DJL)equation,which accurately describes large-amplitude internal solitary waves in a continuous density stratification,the computational errors of large-amplitude internal solitary waves at different pycnocline depths introduced by the strong stratification approximation are *** the pycnocline thicknesses are relatively large(accounting for 8%–10%of the total water depth),the error is much smaller under the three-layer approximation than under the two-layer approximation.

关键词： Internal solitary wave pycnocline Two-layer approximation Three-layer approximation MCC internal wave model DJL equation Wave profile Wave speed

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The barrier layer in the south-ern region of the South China Sea

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Chinese Science Bulletin 2001年第16期46卷 1388-1392页

作者： WU Wei M.Tomczak FANG Xinhua WU Dexing Laboratory of Physical Oceanography Institute of Physical OceanographyOcean University of QingdaoQingdao 266003China Flinders Institute of Atmospheric and Marine Sciences Flinders University of South AustraliaAdelaide 5001Australia 不详

By analysing the CTD data in the southernregion of the South China Sea gathered during six cruisesbetween 1989 and 1999, a barrier layer with seasonalvariation just like what exists in the equatorial oceans isfound in this region. It is the first discovery in such amarginal sea yet. It is strong in autumn and a little weak in summer and winter. The thicker the barrier layer, the higher the average temperature of the upper mixed layer. The region with the thicker barrier layer overlaps the region with thehigher average temperature of the upper mixed layer, andaccords with the thicker region of the warm pool in the South China Sea got from the Levitus data. The barrier layer in the southern region of the South China Sea has significantinfluence on the heat storage of the upper ocean there.

关键词： barrier layer South China Sea thermocline pycnocline mixed layer.

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