Recognition on the forming-vanishing process and underlying mechanisms of the hypoxia off the Yangtze River estuary

doi:10.1007/s11430-014-5007-0

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

	Recognition on the forming-vanishing process and underlying mechanisms of the hypoxia off the Yangtze River estuary
	Wei QinSheng 1,3; Wang BaoDong 1; Chen JianFang 2; Xia ChangShui 1; Qu DaPeng 1; Xie LinPing 1
刊名	SCIENCE CHINA-EARTH SCIENCES
	2015-04
卷号	58 期号:4 页码:628-648
关键词	Yangtze River estuary hypoxic zone stratification flow field environment organic decomposition
ISSN号	1674-7313
DOI	10.1007/s11430-014-5007-0
英文摘要	On the basis of compiled multidisciplinary historical data in 2006-2007 and incorporation of relevant simulation results and remote sensing data, we performed an in-depth study of the generation and dissipation process of the hypoxic zone and its distribution morphology and structure off the Yangtze River estuary. Based on the hydrological circulation dynamics, reproduction of phytoplankton (leading to the decomposition of organic matter), and other factors, we comprehensively and systematically investigated the generation and dissipation of the hypoxic zone and underlying mechanisms for the seasonal variation in its position, explored the multi-factorial synergistic reactions during the generation and dissipation process of the hypoxic zone, and revealed the controlled mechanism for the morphology and structure of the hypoxic zone's distribution. Our studies indicate that in the winter and spring seasons, the hydrological environment off the Yangtze River estuary provides a water body with relatively low contents of dissolved oxygen (DO), which is the background for the formation of a hypoxic zone. After entering into the summer season, the hypoxic zone gradually develops towards the north and becomes mature. Because of the impact of the terrain, local decomposition of organic matter, and upwelling of the Kuroshio subsurface water in July-August, the hypoxic zone off the Yangtze River estuary exhibits the characteristics of discontinuous distribution in space and has a south and north "dual-core" structure in the inner continental shelf. In addition, there is a hypoxic core in the eastern outer continental shelf. The degrees of hypoxia vary for different areas; they are strongest overall in the north, next strongest in the south; they are weakest on the outer continental shelf. In summer, the hypoxic zone in the north is related to the northward differentiation of the southern hypoxic zone and results from local development and intensification. In August, the hypoxic zone in the north reaches its peak, and after September, it rapidly retreats southward and disappears because of weakening stratification. In the fall, there is hypoxic zone along the coast of Zhejiang in the south, and there is also a low-DO area to the southwest of Jeju Island, with both zones disappearing rapidly. In addition, the change of dynamic environment also causes the low-DO area of the outer continental shelf to move outward in the fall. The variation in the intensity of the stratification and its cumulative effects as a barrier of vertical DO transportation over long periods of time have a significant impact on the degree of hypoxia in the hypoxic zone. In addition, the seasonal variations in the size of the stratified region, intensity of each current system/water mass, upwelling, front, and high-value area of phytoplankton biomass jointly restrict the extension of the hypoxic zone in the inner continental shelf and latitudinal (south-north direction) movement of its location off the Yangtze River estuary. The combined effect of dynamic factors, such as that of the Kuroshio subsurface water, causes a low-DO core in the outer continental shelf. The bottom cold water to the north of the East China Sea is the dynamic basis for the formation of the low-DO area to the southwest of Jeju Island during the fall season. The special seabed topography and mud area distribution off the Yangtze River estuary have a certain degree of influence on the development of the hypoxic zone.
电子版国际标准刊号	18691897
资助项目	National Key Technology Research and Development Program of China[2008BAC42B02]
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000351861700012
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3680]
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.State Ocean Adm, Inst Oceanog 2, Hangzhou 310012, Zhejiang, Peoples R China; 3.Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China
推荐引用方式 GB/T 7714	Wei QinSheng,Wang BaoDong,Chen JianFang,et al. Recognition on the forming-vanishing process and underlying mechanisms of the hypoxia off the Yangtze River estuary[J]. SCIENCE CHINA-EARTH SCIENCES,2015,58(4):628-648.
APA	Wei QinSheng,Wang BaoDong,Chen JianFang,Xia ChangShui,Qu DaPeng,&Xie LinPing.(2015).Recognition on the forming-vanishing process and underlying mechanisms of the hypoxia off the Yangtze River estuary.SCIENCE CHINA-EARTH SCIENCES,58(4),628-648.
MLA	Wei QinSheng,et al."Recognition on the forming-vanishing process and underlying mechanisms of the hypoxia off the Yangtze River estuary".SCIENCE CHINA-EARTH SCIENCES 58.4(2015):628-648.