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学科主题: Oceanography
题名: Seasonal characteristics of internal tides on the continental shelf in the northern South China Sea
作者: Guo, P ; Fang, WD ; Liu, CJ ; Qiu, FW
通讯作者: guopu@scsio.ac.cn
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2012
卷: 117, 页:C04023
部门归属: [Guo, Pu; Fang, Wendong; Qiu, Fuwen] Chinese Acad Sci, State Key Lab Trop Oceanog, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Liu, Changjian] S China Sea Marine Engn Surveying Ctr, Guangzhou 510300, Guangdong, Peoples R China
项目归属: LTO
摘要: Three across-shelf Acoustic Doppler Current Profiler (ADCP) moorings were deployed on the continental shelf in the northern South China Sea in 2006 and 2007, in order to obtain time series of ocean currents. During each of the three observational periods, in spring, autumn, and winter seasons, the observation was sustained for at least 1 month. Conductivity-temperature-depth data were also collected in the vicinity of these ADCP moorings. The two diurnal baroclinic constituents (O-1 and K-1) are found to be more prominent than the semidiurnal baroclinic ones (M-2 and S-2) at each mooring site, which are different from the barotropic tides. The highest diurnal (semidiurnal) baroclinic kinetic energy density exceeded 10 (2.7) kJ/m(2) during the observational periods. In each observational period, the vertical structures of baroclinic tidal ellipses indicate mode-1 characteristics for O-1 and K-1, whereas some of the semidiurnal internal tides show mode-2 characteristics in autumn. Propagation directions of the diurnal and semidiurnal internal tides are basically across-shelf, and their phase speeds estimated from phase changes and buoyancy frequencies indicate deceleration of internal tides, when the internal tidal waves propagate from deeper shelf break to shallower shelf. The increased stratification in autumn is favorable for maintaining internal tidal waveform and preserving internal tidal energy, while the intensity of the internal tidal flow decreases significantly in winter.
语种: 英语
WOS记录号: WOS:000302857500001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10181
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Guo, P; Fang, WD; Liu, CJ; Qiu, FW.Seasonal characteristics of internal tides on the continental shelf in the northern South China Sea,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2012,117():C04023
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