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引用本文:陈子飞,任强,胡贺岗,陈永华,王蓓,于非,南峰,王建丰,唐瑛.南海西北部半日内潮参量次谐频不稳定生成的近惯性波研究.海洋与湖沼,2022,53(1):62-73.
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南海西北部半日内潮参量次谐频不稳定生成的近惯性波研究
陈子飞1,2,3, 任强1,3,4, 胡贺岗1,2,3, 陈永华1,3, 王蓓1,2,3, 于非1,2,3,4,5, 南峰1,3,4,5, 王建丰1,3,4,5, 唐瑛1,3
1.中国科学院海洋研究所 山东青岛 266071;2.中国科学院大学 北京 100049;3.中国科学院 海洋环流与波动重点实验室 山东青岛 266071;4.中国科学院海洋大科学研究中心 山东青岛 266071;5.青岛海洋科学与技术试点国家实验室 海洋动力过程与气候功能实验室 山东青岛 266237
摘要:
为了研究非临界纬度上参量次谐频不稳定(parametric subharmonic instability,PSI)过程生成的近惯性波(near-inertial wave,NIW),本文基于国家重点研发项目的准实时传输深海潜标资料,对内波速度谱、近惯性流速和动能、D2-f(半日频减惯性频)流速和动能、半日内潮流速和动能以及混合的时间分布特征进行了研究分析。平板模型与双相干谱分析表明,南海西北部陆坡区上层海洋出现的非风生近惯性波是由半日内潮PSI过程生成的,同时也会生成D2-f内波。在发生显著PSI过程的深度上,生成的近惯性能量与全日内潮能量相当,生成的D2-f能量与半日内潮能量相当,表明PSI过程生成的近惯性波和D2-f内波是相当重要的。细尺度参数化方法结果显示PSI过程期间混合出现明显增强,但其增加的大小是中度的。
关键词:  南海西北部  半日内潮  近惯性波  参量次谐频不稳定  海洋混合
DOI:10.11693/hyhz20210800174
分类号:P731.24
基金项目:国家重点研发计划项目,2017YFC1403401号;自然科学基金委员会-山东省联合基金海洋科学研究中心项目,U1406401号。
附件
SEMIDIURAL TIDE PARAMETETRIC SUBHARMONIC INSTABILITY INDUCED NEAR-INERTIAL WAVES IN NORTHWESTERN SOUTH CHINA SEA
CHEN Zi-Fei1,2,3, REN Qiang1,3,4, HU He-Gang1,2,3, CHEN Yong-Hua1,3, WANG Bei1,2,3, YU Fei1,2,3,4,5, NAN Feng1,3,4,5, WANG Jian-Feng1,3,4,5, TANG Ying1,3
1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.CAS Key Laboratory of Ocean Circulation and Waves, Chinese Academy of Sciences, Qingdao 266071, China;4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;5.Marine Dynamic Process and Climate Function Laboratory, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
Abstract:
In order to study the near-inertial wave (NIW) generated by the parametric subharmonic instability (PSI) process at non-critical latitudes, this paper examines the internal wave velocity spectrum, near inertial velocity and kinetic energy, D2-f (semidiurnal frequency minus inertial frequency) velocity and kinetic energy, semidiurnal tidal velocity and kinetic energy, and the time variation of turbulent mixing based on the data of quasi-real-time transmission subsurface mooring system. The slab model and bicoherence spectrum analysis show that the non-wind-generated near inertial waves appearing in the upper ocean are generated by the PSI of semidiurnal internal tides. The PSI not only generates diurnal internal waves, but also produces inertial frequency and D2-f motions in the non-critical latitudes of the Northwestern Slope of the South China Sea. At some depth where the PSI process is discernible, the near-inertial energy generated by the PSI is equivalent to the diurnal tidal energy, and the D2-f energy is equivalent to the semidiurnal tidal energy. In addition, significant PSI processes usually occur during strong semidiurnal movements. The results of the fine-scale parameterization method shows that the mixing is obviously enhanced during the PSI process, but the increase is moderate.
Key words:  Northwestern South China Sea  semidiurnal tides  near-inertial waves  parametric subharmonic instability (PSI)  turbulent mixing
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