Bottom currents observed in and around a submarine valley on the continental slope of the northern South China Sea

doi:10.1007/s11802-016-3054-1

CORC > 自然资源部第一海洋研究所 > 自然资源部第一海洋研究所 > 业务部门 > 海洋环境与数值模拟研究室

	Bottom currents observed in and around a submarine valley on the continental slope of the northern South China Sea
	Wu, Lunyu 1; Xiong, Xuejun 1; Li, Xiaolong 2; Shi, Maochong 3; Guo, Yongqing 1; Chen, Liang 1
刊名	JOURNAL OF OCEAN UNIVERSITY OF CHINA
	2016-12
卷号	15 期号:6 页码:947-957
关键词	bottom currents valley continental slope South China Sea
ISSN号	1672-5182
DOI	10.1007/s11802-016-3054-1
英文摘要	Bottom currents at about 1000 m depth in and around a submarine valley on the continental slope of the northern South China Sea were studied by a 14-month long experiment from July 2013 to September 2014. The observations reveal that bottom currents are strongly influenced by the topography, being along valley axis or isobaths. Power density spectrum analysis shows that all the currents have significant peaks at diurnal and semi-diurnal frequencies. Diurnal energy is dominant at the open slope site, which is consistent with many previous studies. However, at the site inside the valley the semi-diurnal energy dominates, although the distance between the two sites of observation is quite small (11 km) compared to a typical horizontal first-mode internal tide wavelength (200 km). We found this phenomenon is caused by the focusing of internal waves of certain frequencies in the valley. The inertial peak is found only at the open slope site in the first deployment but missing at the inside valley site and the rest of the deployments. Monthly averaged residual currents reveal that the near-bottom currents on the slope flow southwestward throughout the year except in August and September, 2013, from which we speculate that this is a result of the interaction between a mesoscale eddy and the canyon/sag topography. Currents inside the valley within about 10 mab basically flow along slope and in the layers above the 10 mab the currents are northwestward, that is, from the deep ocean to the shelf. The monthly mean current vectors manifest an Ekman layer-like vertical structure at both sites, which rotate counter-clockwise looking from above.
资助项目	NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406404]
WOS研究方向	Oceanography
语种	英语
出版者	OCEAN UNIV CHINA
WOS记录号	WOS:000387575400003
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3299]
专题	业务部门_海洋环境与数值模拟研究室
作者单位	1.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China; 2.CNOOC Deepwater Exploitat Co Ltd, Shenzhen 518067, Peoples R China; 3.Ocean Univ China, Coll Phys & Environm Oceanog, Qingdao 266100, Peoples R China
推荐引用方式 GB/T 7714	Wu, Lunyu,Xiong, Xuejun,Li, Xiaolong,et al. Bottom currents observed in and around a submarine valley on the continental slope of the northern South China Sea[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2016,15(6):947-957.
APA	Wu, Lunyu,Xiong, Xuejun,Li, Xiaolong,Shi, Maochong,Guo, Yongqing,&Chen, Liang.(2016).Bottom currents observed in and around a submarine valley on the continental slope of the northern South China Sea.JOURNAL OF OCEAN UNIVERSITY OF CHINA,15(6),947-957.
MLA	Wu, Lunyu,et al."Bottom currents observed in and around a submarine valley on the continental slope of the northern South China Sea".JOURNAL OF OCEAN UNIVERSITY OF CHINA 15.6(2016):947-957.