气候变化领域集成服务门户(CCPortal): Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea

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DOI	10.1029/2020JC016061
	Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea
	Liu S.M.; Ning X.; Dong S.; Song G.; Wang L.; Altabet M.A.; Zhu Z.; Wu Y.; Ren J.L.; Liu C.G.; Zhang J.; Huang D.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	Nitrogen transfer processes and NO3− sources in the East China Sea (ECS) were analyzed using dual isotopes of NO3− and NO2−, the concentration and isotopes of dissolved O2 and N2 gases, nutrient concentrations, and the hydrological conditions. It was clear that the δ15N and δ18O values of NO3− in the Changjiang freshwater were 5.6–6.6‰ and 0.6–1.0‰, respectively, affected by human activities (fertilizer, sewage, and manure) and nitrification. Off the Changjiang Estuary to the ECS continental slope, the NO3− concentration was lower or exhausted in the upper water layers, where both available δ15N and δ18O values for NO3− were high related to phytoplankton assimilation. In the lower water layers, organic matter remineralization, nitrification, and coupled sedimentary nitrification and denitrification resulted in low NO3− isotope values. Moreover, in the upper water layers of the ECS continental slope, NO3− showed high δ15N and δ18O values and low Δ(15, 18) values affected by assimilation, nitrification, and N2 fixation. NO2− in the ECS was dominated by NH4+ oxidation, and NO2− oxidation plays an important role in depleting NO2− in δ15N values. An overall NO3− budget is built for the ECS shelf, indicating that open boundary exchanges of NO3− flux and isotopes through Kuroshio invasion and Taiwan Warm Current Water are comparable to outflow off the ECS shelf, and nitrogen transformation processes (such as NO3− assimilation and nitrification) play an important role in nitrogen cycle, and NO3− is modified on the ECS shelf. ©2020. American Geophysical Union. All Rights Reserved.
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/186712
作者单位	Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, Ocean University of China, Qingdao, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; School of Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, MA, United States; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
推荐引用方式 GB/T 7714	Liu S.M.,Ning X.,Dong S.,et al. Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea[J],2020,125(8).
APA	Liu S.M..,Ning X..,Dong S..,Song G..,Wang L..,...&Huang D..(2020).Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea.Journal of Geophysical Research: Oceans,125(8).
MLA	Liu S.M.,et al."Source Versus Recycling Influences on the Isotopic Composition of Nitrate and Nitrite in the East China Sea".Journal of Geophysical Research: Oceans 125.8(2020).