Variability of internal tides and near-inertial waves on the continental slope of the northwestern South China Sea

doi:10.1029/2012JC008212

IOCAS-IR > 海洋环流与波动重点实验室

	Variability of internal tides and near-inertial waves on the continental slope of the northwestern South China Sea
	Xu, Zhenhua 1,2; Yin, Baoshu 1,2; Hou, Yijun 1,2; Xu, Yongsheng1,2 ; Yin, BS
	2013
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	118 期号:1 页码:197-211
文章类型	Article
摘要	Structure and variability of internal tides (IT) and near-inertial waves (NIW) on the continental slope of the northwestern South China Sea were investigated, based on 9-month moored current observations from autumn to early summer in 2008 and 2009. The diurnal IT kinetic energy, dominant over that of semidiurnal tides, is found to exhibit apparent seasonal variability-strongest in summer and weakest in winter-whereas the semidiurnal variance remained nearly uniform throughout the observation period. Moreover, the diurnal IT were more coherent (i.e., phase-locked to the astronomical forcing) than the semidiurnal constituents. Coherent diurnal variance accounts for about 40% of diurnal motions, but semidiurnal tides contain a much smaller fraction (10%) of coherent motions. Further analysis demonstrates that the diurnal IT are dominated by the first mode, whereas the semidiurnal tides show a variable multimodal structure: the second mode is dominant in summer and comparable to the first mode in spring and autumn, but the first mode predominates in winter. Multimodal semidiurnal IT are more influenced by varying stratification structures and background currents and thus exhibit highly incoherent and intermittent behavior, which may wash out seasonal variability during their long propagation from the generation source. The observed NIW are seasonally independent and comparable to the semidiurnal motions. During the passage of Typhoon Hagupit, however, the NIW became the most energetic component of the inertia-gravity waveband motions. NIW energy and shear were significantly enhanced and exceeded tidal counterparts by a factor of 2 to 3 in the upper layer.; Structure and variability of internal tides (IT) and near-inertial waves (NIW) on the continental slope of the northwestern South China Sea were investigated, based on 9-month moored current observations from autumn to early summer in 2008 and 2009. The diurnal IT kinetic energy, dominant over that of semidiurnal tides, is found to exhibit apparent seasonal variability-strongest in summer and weakest in winter-whereas the semidiurnal variance remained nearly uniform throughout the observation period. Moreover, the diurnal IT were more coherent (i.e., phase-locked to the astronomical forcing) than the semidiurnal constituents. Coherent diurnal variance accounts for about 40% of diurnal motions, but semidiurnal tides contain a much smaller fraction (10%) of coherent motions. Further analysis demonstrates that the diurnal IT are dominated by the first mode, whereas the semidiurnal tides show a variable multimodal structure: the second mode is dominant in summer and comparable to the first mode in spring and autumn, but the first mode predominates in winter. Multimodal semidiurnal IT are more influenced by varying stratification structures and background currents and thus exhibit highly incoherent and intermittent behavior, which may wash out seasonal variability during their long propagation from the generation source. The observed NIW are seasonally independent and comparable to the semidiurnal motions. During the passage of Typhoon Hagupit, however, the NIW became the most energetic component of the inertia-gravity waveband motions. NIW energy and shear were significantly enhanced and exceeded tidal counterparts by a factor of 2 to 3 in the upper layer.
学科领域	Oceanography
DOI	10.1029/2012JC008212
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000317836100014
WOS关键词	SOLITARY WAVES ; DEEP-OCEAN ; MULTIMODAL STRUCTURE ; HAWAIIAN RIDGE ; PART I ; PROPAGATION ; BAY ; GENERATION ; SOLITONS ; BISCAY
WOS标题词	Science & Technology ; Physical Sciences
引用统计	被引频次：100[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16450
专题	海洋环流与波动重点实验室
通讯作者	Yin, BS
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Key Lab Ocean Circulat & Waves KLOCAW, Qingdao 266071, Peoples R China
第一作者单位	中国科学院海洋研究所; 海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Xu, Zhenhua,Yin, Baoshu,Hou, Yijun,et al. Variability of internal tides and near-inertial waves on the continental slope of the northwestern South China Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2013,118(1):197-211.
APA	Xu, Zhenhua,Yin, Baoshu,Hou, Yijun,Xu, Yongsheng,&Yin, BS.(2013).Variability of internal tides and near-inertial waves on the continental slope of the northwestern South China Sea.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,118(1),197-211.
MLA	Xu, Zhenhua,et al."Variability of internal tides and near-inertial waves on the continental slope of the northwestern South China Sea".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 118.1(2013):197-211.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Variability of inter（2120KB）			限制开放	CC BY-NC-SA	浏览