Tidally induced upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer

doi:10.1007/s11430-007-2050-0

IOCAS-IR > 海洋环流与波动重点实验室

	Tidally induced upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer
	Lv Xingang ; Qiao Fangli ; Xia Changshui ; Yuan Yeli
	2007-03-01
发表期刊	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
ISSN	1006-9313
卷号	50 期号:3 页码:462-473
文章类型	Article
摘要	MASNUM wave-tide-circulation coupled numerical model (MASNUM coupled model, hereinafter) is developed based on the Princeton Ocean Model (POM). Both POM and MASNUM coupled model are applied in the numerical simulation of the upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer. The upwelling mechanisms are analyzed from the viewpoint of tide, and a new mechanism is proposed. The study suggests that the tidally inducing mechanism of the upwelling includes two dynamic aspects: the barotropic and the baroclinic process. On the one hand, the residual currents induced by barotropic tides converge near the seabed, and upwelling is generated to maintain mass conservation. The climbing of the residual currents along the sea bottom slope also contributes to the upwelling. On the other hand, tidal mixing plays a very important role in inducing the upwelling in the baroclinic sea circumstances. Strong tidal mixing leads to conspicuous front in the coastal waters. The considerable horizontal density gradient across the front elicits a secondary circulation clinging to the tidal front, and the upwelling branch appears near the frontal zone. Numerical experiments are designed to determine the importance of tide in inducing the upwelling. The results indicate that tide is a key and dominant inducement of the upwelling. Experiments also show that coupling calculation of the four main tidal constituents(M-2, S-2, K-1, and O-1), rather than dealing with the single M-2 constituent, improves the modeling precision of the barotropic tide-induced upwelling.; MASNUM wave-tide-circulation coupled numerical model (MASNUM coupled model, hereinafter) is developed based on the Princeton Ocean Model (POM). Both POM and MASNUM coupled model are applied in the numerical simulation of the upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer. The upwelling mechanisms are analyzed from the viewpoint of tide, and a new mechanism is proposed. The study suggests that the tidally inducing mechanism of the upwelling includes two dynamic aspects: the barotropic and the baroclinic process. On the one hand, the residual currents induced by barotropic tides converge near the seabed, and upwelling is generated to maintain mass conservation. The climbing of the residual currents along the sea bottom slope also contributes to the upwelling. On the other hand, tidal mixing plays a very important role in inducing the upwelling in the baroclinic sea circumstances. Strong tidal mixing leads to conspicuous front in the coastal waters. The considerable horizontal density gradient across the front elicits a secondary circulation clinging to the tidal front, and the upwelling branch appears near the frontal zone. Numerical experiments are designed to determine the importance of tide in inducing the upwelling. The results indicate that tide is a key and dominant inducement of the upwelling. Experiments also show that coupling calculation of the four main tidal constituents(M-2, S-2, K-1, and O-1), rather than dealing with the single M-2 constituent, improves the modeling precision of the barotropic tide-induced upwelling.
关键词	Upwelling Dynamic Mechanism Numerical Simulation Tidal Movement Tidal Mixing Front
学科领域	Geosciences, Multidisciplinary
DOI	10.1007/s11430-007-2050-0
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000246031700015
引用统计	被引频次：39[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/337002/5226
专题	海洋环流与波动重点实验室
作者单位	1.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China 2.State Ocean Adm, Key Lab Marine Sci & Numer Modling, MASNUM, Qingdao 266061, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 4.Grad Univ Chinese Acad Sci, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Lv Xingang,Qiao Fangli,Xia Changshui,et al. Tidally induced upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2007,50(3):462-473.
APA	Lv Xingang,Qiao Fangli,Xia Changshui,&Yuan Yeli.(2007).Tidally induced upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,50(3),462-473.
MLA	Lv Xingang,et al."Tidally induced upwelling off Yangtze River estuary and in Zhejiang coastal waters in summer".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 50.3(2007):462-473.

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