气候变化领域集成服务门户(CCPortal): Hydrodynamic impacts on tidal-scale dissolved inorganic nitrogen cycling and export across the estuarine turbidity maxima to coast

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DOI	10.1007/s10533-020-00712-4
	Hydrodynamic impacts on tidal-scale dissolved inorganic nitrogen cycling and export across the estuarine turbidity maxima to coast
	Yu D.; Chen N.; Cheng P.; Yu F.; Hong H.
发表日期	2020
ISSN	0168-2563
起始页码	81
结束页码	98
卷号	151 期号:1
英文摘要	Estuarine turbidity maxima (ETM) is a transition zone subject to the influence of river flow and tides. Here we showed the distinct impacts of fluvial and tidal hydrodynamics on dissolved inorganic nitrogen (DIN) cycling and export across the ETM to coast. We conducted tidal-scale hourly measurements at the ETM zone of the Jiulong River Estuary in Southeast China in May and December 2015. Generally, ammonium-N (NH4-N) and nitrate-N (NO3-N) increased in ebb tides, primarily controlled by freshwater input. In contrast, nitrite-N (NO2-N) increased in flood tides, largely due to the horizontal advection of NO2-N rich water from the middle estuary (5–10 PSU). During the fresh–saline water mixing period with high suspended particulate matters (SPM), the stronger tides and smaller river discharge in December increased SPM and NO2-N in the ETM, indicating stronger ammonium oxidation in the water column. During the low tide period when freshwater dominated and particles were deposited, the increase of NH4-N in the water column was related to the external source supply (e.g., wetland effluent), while the decline of NO3-N and NO2-N was likely associated with denitrification occurring in anoxic fluid muds and sediments. The larger DIN flux was found in May with larger river discharge, weaker tides and longer duration of the freshwater dominated period than December. This study highlights the combined effects of river and tides on hydrodynamics, which largely determine the major N sources, processes (e.g., nitrification and denitrification) and DIN fluxes across the ETM to coast. © 2020, Springer Nature Switzerland AG.
英文关键词	Dissolved inorganic nitrogen; Estuarine turbidity maxima; Land–sea interface; Nitrogen cycling; Tidal variation
语种	英语
scopus关键词	advection; denitrification; dissolved inorganic nitrogen; estuarine ecosystem; flux measurement; hydrodynamics; nitrogen cycle; transition zone; turbidity; water column; China; Fujian; Jiulong Estuary
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153095
作者单位	State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102, China; Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China
推荐引用方式 GB/T 7714	Yu D.,Chen N.,Cheng P.,et al. Hydrodynamic impacts on tidal-scale dissolved inorganic nitrogen cycling and export across the estuarine turbidity maxima to coast[J],2020,151(1).
APA	Yu D.,Chen N.,Cheng P.,Yu F.,&Hong H..(2020).Hydrodynamic impacts on tidal-scale dissolved inorganic nitrogen cycling and export across the estuarine turbidity maxima to coast.Biogeochemistry,151(1).
MLA	Yu D.,et al."Hydrodynamic impacts on tidal-scale dissolved inorganic nitrogen cycling and export across the estuarine turbidity maxima to coast".Biogeochemistry 151.1(2020).