气候变化领域集成服务门户(CCPortal): Vortex and Biogeochemical Dynamics for the Hypoxia Formation Within the Coastal Transition Zone off the Pearl River Estuary

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DOI	10.1029/2020JC016178
	Vortex and Biogeochemical Dynamics for the Hypoxia Formation Within the Coastal Transition Zone off the Pearl River Estuary
	Li D.; Gan J.; Hui R.; Liu Z.; Yu L.; Lu Z.; Dai M.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	Satellite-derived chlorophyll data, in situ measurements, and time series buoy monitoring revealed the persistent and deteriorating seasonal eutrophication and hypoxia with two distinct centers in the coastal transition zone (CTZ) between the Pearl River Estuary and the adjacent continental shelf off Hong Kong. We used a process-oriented coupled physical-biogeochemical numerical model to investigate the intrinsic physical and biogeochemical dynamics under the extrinsic forcing of wind, river discharge, and tides for the hypoxia formation in the CTZ. We found that the convergence induced by cyclonic vortices in the CTZ, which were formed by the buoyancy-driven currents and wind-driven shelf currents, created the stable water column with weak mixing and long residence time and accumulated nutrients and organic matter for the eutrophication and hypoxia development. The biophysical responses to spring-neap cycle further demonstrated the coherent linkages of oceanic currents, vortex formation, and convergence of organic matter within the CTZ and indicated the critical role of mixing in the dissolved oxygen (DO) budgets during the spring-neap tidal cycle. The study found that biogeochemical substances and processes are necessary conditions for eutrophication and hypoxia formation, and when these necessary conditions are combined with the favorable hydrodynamic conditions, they form a sufficient condition for eutrophication and hypoxia formation in the CTZ. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Coastal transition zone; Coupled physical and biogeochemical dynamics; Eutrophication and hypoxia; Numerical Modeling; Observation; Pearl River Estuary
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186731
作者单位	Department of Ocean Science and Department of Mathematics, Hong Kong University of Science and Technology, Hong Kong; Division of Environment and Sustainability, Hong Kong University of Science and Technology, Hong Kong; Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China
推荐引用方式 GB/T 7714	Li D.,Gan J.,Hui R.,et al. Vortex and Biogeochemical Dynamics for the Hypoxia Formation Within the Coastal Transition Zone off the Pearl River Estuary[J],2020,125(8).
APA	Li D..,Gan J..,Hui R..,Liu Z..,Yu L..,...&Dai M..(2020).Vortex and Biogeochemical Dynamics for the Hypoxia Formation Within the Coastal Transition Zone off the Pearl River Estuary.Journal of Geophysical Research: Oceans,125(8).
MLA	Li D.,et al."Vortex and Biogeochemical Dynamics for the Hypoxia Formation Within the Coastal Transition Zone off the Pearl River Estuary".Journal of Geophysical Research: Oceans 125.8(2020).