The role of Qiongzhou Strait in the seasonal variation of the South China Sea circulation

IOCAS-IR > 海洋环流与波动重点实验室

	The role of Qiongzhou Strait in the seasonal variation of the South China Sea circulation
	Shi, MC ; Chen, CS ; Xu, QC ; Lin, HC ; Liu, GM ; Wang, H ; Wang, F ; Yan, JH
	2002
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	32 期号:1 页码:103-121
文章类型	Article
摘要	An analysis of the water level and current data taken in Qiongzhou Strait in the South China Sea (SCS) over the last 37 years (1963 to 1999) was made to examine the characteristics of tidal waves and residual flow through the strait and their roles in the seasonal variation of the SCS circulation. The observations reveal that Qiongzhou Strait is an area where opposing tidal waves interact and a source of water transport to the Gulf of Beibu (Gulf of Tonkin), SCS. A year-round westward mean flow with a maximum speed of 10-40 cm s(-1) is found in Qiongzhou Strait. This accounts for water transport of 0.2-0.4 Sv and 0.1-0.2 Sv into the Gulf of Beibu in winter-spring and summer-autumn, respectively. The outflow from Qiongzhou Strait may cause up to 44% of the gulf water to be refreshed each season, suggesting that it has a significant impact on the seasonal circulation in the Gulf of Beibu. This finding is in contrast to our current understanding that the seasonal circulation patterns in the South China Sea are primarily driven by seasonal winds. Several numerical experiments were conducted to examine the physical mechanisms responsible for the formation of the westward mean flow in Qiongzhou Strait. The model provides a reasonable simulation of semidiurnal and diurnal tidal waves in the strait and the predicted residual flow generally agrees with the observed mean flow. An analysis of the momentum equations indicates that the strong westward flow is driven mainly by tidal rectification over variable bottom topography. Both observations and modeling suggest that the coastal physical processes associated with tidal rectification and buoyancy input must be taken into account when the mass balance of the SCS circulation is investigated, especially for the regional circulation in the Gulf of Beibu.; An analysis of the water level and current data taken in Qiongzhou Strait in the South China Sea (SCS) over the last 37 years (1963 to 1999) was made to examine the characteristics of tidal waves and residual flow through the strait and their roles in the seasonal variation of the SCS circulation. The observations reveal that Qiongzhou Strait is an area where opposing tidal waves interact and a source of water transport to the Gulf of Beibu (Gulf of Tonkin), SCS. A year-round westward mean flow with a maximum speed of 10-40 cm s(-1) is found in Qiongzhou Strait. This accounts for water transport of 0.2-0.4 Sv and 0.1-0.2 Sv into the Gulf of Beibu in winter-spring and summer-autumn, respectively. The outflow from Qiongzhou Strait may cause up to 44% of the gulf water to be refreshed each season, suggesting that it has a significant impact on the seasonal circulation in the Gulf of Beibu. This finding is in contrast to our current understanding that the seasonal circulation patterns in the South China Sea are primarily driven by seasonal winds. Several numerical experiments were conducted to examine the physical mechanisms responsible for the formation of the westward mean flow in Qiongzhou Strait. The model provides a reasonable simulation of semidiurnal and diurnal tidal waves in the strait and the predicted residual flow generally agrees with the observed mean flow. An analysis of the momentum equations indicates that the strong westward flow is driven mainly by tidal rectification over variable bottom topography. Both observations and modeling suggest that the coastal physical processes associated with tidal rectification and buoyancy input must be taken into account when the mass balance of the SCS circulation is investigated, especially for the regional circulation in the Gulf of Beibu.
关键词	Stratified Tidal Rectification Finite-amplitude Banks Georges-bank Winter
学科领域	Oceanography
收录类别	SCI
语种	英语
WOS记录号	WOS:000173257700005
引用统计	被引频次：95[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/337002/2530
专题	海洋环流与波动重点实验室
作者单位	1.Univ Massachusetts Dartmouth, Sch Marine Sci & Technol, New Bedford, MA 02744 USA 2.Ocean Univ Qingdao, Dept Oceanog & Meteorol, Qingdao 266003, Peoples R China 3.Ocean Univ Qingdao, Inst Phys Oceanog, Qingdao 266003, Peoples R China 4.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA 5.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 6.SOA, Branch Bur S China Sea, Ctr Marine Survey Technol, Guangzhou, Peoples R China
推荐引用方式 GB/T 7714	Shi, MC,Chen, CS,Xu, QC,et al. The role of Qiongzhou Strait in the seasonal variation of the South China Sea circulation[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2002,32(1):103-121.
APA	Shi, MC.,Chen, CS.,Xu, QC.,Lin, HC.,Liu, GM.,...&Yan, JH.(2002).The role of Qiongzhou Strait in the seasonal variation of the South China Sea circulation.JOURNAL OF PHYSICAL OCEANOGRAPHY,32(1),103-121.
MLA	Shi, MC,et al."The role of Qiongzhou Strait in the seasonal variation of the South China Sea circulation".JOURNAL OF PHYSICAL OCEANOGRAPHY 32.1(2002):103-121.

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