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  

SEMIDIURAL TIDE PARAMETETRIC SUBHARMONIC INSTABILITY INDUCED NEAR-INERTIAL WAVES IN NORTHWESTERN SOUTH CHINA SEA

作　　者：陈子飞 任强[1,3,4] 胡贺岗 陈永华[1,3] 王蓓 于非[1,2,3,4,5] 南峰 王建丰[1,3,4,5] 唐瑛 CHEN Zi-Fei;REN Qiang;HU He-Gang;CHEN Yong-Hua;WANG Bei;YU Fei;NAN Feng;WANG Jian-Feng;TANG Ying(Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Key Laboratory of Ocean Circulation and Waves,Chinese Academy of Sciences,Qingdao 266071,China;Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China;Marine Dynamic Process and Climate Function Laboratory,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China)

机构地区：[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

出　　处：《海洋与湖沼》2022年第1期62-73,共12页Oceanologia Et Limnologia Sinica

基　　金：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。

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、D_(2)-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D_(2)-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D_(2)-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D_(2)-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。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, D_(2)-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 D_(2)-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 D_(2)-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.

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 

分 类 号：P731.24[天文地球—海洋科学]