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学科主题: Oceanography
题名: Observed near-inertial kinetic energy in the northwestern South China Sea
作者: [Chen, Gengxin ; Xue, Huijie ; Wang, Dongxiao ; Xie, Qiang] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China ; [Xue, Huijie] Univ Maine, Sch Marine Sci, Orono, ME USA ; [Xie, Qiang] Chinese Acad Sci, Sanya Inst Deep Sea Sci Engn, Sanya, Peoples R China
通讯作者: hxue@maine.edu
关键词: inertial kinetic energy ; South China Sea ; storm ; eddy
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2013
卷: 118, 期:10, 页:4965-4977
部门归属: LTO
资助者: Insightful comments from Willi Rath and another anonymous reviewer are very helpful in improving the work. This work is supported by National Basic Research Program of China (grant 2011CB403504 and 2011CB403503), the Guangzhou City Project for the Pearl River New Star in Science and Technology (grant 2013J2200087), and National Natural Science Foundation of China (grant 41106027 and 41206008).
摘要: Based on more than 3 years of moored current-meter records, this study examined seasonal variability of near-inertial kinetic energy (NIKE) as well as all large (greater than one standard deviation from the mean) NIKE events related to storms and eddies in the northwestern South China Sea. The NIKE in the subsurface layer (30-450 m) exhibited obvious seasonal variability with larger values in autumn (herein defined as August, September, and October). All large NIKE events during the observation period were generated by passing storms. Most of the NIKE events had an e-folding timescale longer than 7 d. The phase velocity, vertical wavelength, and frequency shift of these events were examined. The maximum NIKE, induced by typhoon Neoguri, was observed in April 2008. Normal mode analysis suggested that the combined effects of the first four modes determined the vertical distribution of NIKE with higher NIKE below 70 m but lower NIKE from 30 to 70 m. Another near-inertial oscillation event observed in August 2007 had the longest e-folding timescale of 13.5 d. Moreover, the NIKE propagated both upward and downward during this event. A ray-tracing model indicated that the smaller Brunt-Vaisala frequency and the stronger vertical shear of horizontal currents in an anticyclonic eddy and the near-inertial wave with larger horizontal scale facilitated the unusual propagation of the NIKE and the long decay timescale. Although the NIKE originated from wind, the water column structure affected by diverse oceanographic processes contributed substantially to its complex propagation and distribution.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000327380100015
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10877
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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[Chen, Gengxin; Xue, Huijie; Wang, Dongxiao; Xie, Qiang] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Xue, Huijie] Univ Maine, Sch Marine Sci, Orono, ME USA; [Xie, Qiang] Chinese Acad Sci, Sanya Inst Deep Sea Sci Engn, Sanya, Peoples R China.Observed near-inertial kinetic energy in the northwestern South China Sea,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2013,118(10):4965-4977
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