Nitrate Regeneration and Loss in the Central Yellow Sea Bottom Water Revealed by Nitrogen Isotopes

doi:10.3389/fmars.2022.834953

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 中科院海岸带环境过程与生态修复重点实验室

	Nitrate Regeneration and Loss in the Central Yellow Sea Bottom Water Revealed by Nitrogen Isotopes
	Tian, Shichao 5; Gaye, Birgit 5; Tang, Jianhui 4; Luo, Yongming 3,4; Lahajnar, Niko 5; Daehnke, Kirstin 2; Sanders, Tina 2; Xiong, Tianqi 1; Zhai, Weidong 1; Emeis, Kay-Christian 2,5
刊名	FRONTIERS IN MARINE SCIENCE
	2022-03-24
卷号	9 页码:19
关键词	Yellow Sea Cold Water Mass nitrate nitrate dual isotopes nitrification N loss
DOI	10.3389/fmars.2022.834953
通讯作者	Tian, Shichao(tiansc_1989@126.com)
英文摘要	The Yellow Sea (YS) is an epicontinental sea framed by the densely populated mainland of China and the Korean peninsula. Human activities over the last decades resulted in heavily increasing discharge of reactive nitrogen into the YS, which created numerous ecological problems. To elucidate the role of central YS in the cycling of reactive nitrogen, specifically the Yellow Sea Cold Water Mass (YSCWM), we determined nutrient concentrations, dual stable isotopes of nitrate (delta N-15-NO3- and delta O-18-NO3-), and stable isotopes of particulate and sedimentary nitrogen in spring and summer, i.e., in biologically inactive and active periods. The nitrate concentration in spring was higher than that in summer in the northern part of the YSCWM, Nitrate increased in the southern part accompanied by a decrease in delta N-15-NO3- and delta O-18-NO3-, which are indicative of nitrification that was a significant source of recycled nitrate in the south part of YSCWM. To quantify this regenerated nitrate, we use a mixing model with end members of preformed nitrate in spring and regenerated nitrate in summer, both with their distinct dual isotope values. The results suggest that only 35% nitrate was a residual of nitrate preformed in spring and 65% in summer in the southern branch of YSCWM was regenerated. The northern part of YSCWM has low concentrations of dissolved inorganic nitrogen, mainly because of denitrification in sediments. In contrast, the southern pool of YSCWM is a growing reservoir of regenerated terrestrial reactive nitrogen, the addition of which compensates the removal by co-occurring sediment denitrification. In consequence, the southern branch of YSCWM is facing a higher ecological risk than the northern branch, when excess reactive nitrogen discharge from Changjiang River continues at present levels or even increases.
WOS关键词	CHANGJIANG RIVER ESTUARY ; EAST CHINA SEA ; PHYTOPLANKTON COMMUNITY ; SEASONAL-VARIATIONS ; NUTRIENT FLUXES ; SPRING BLOOMS ; FRESH-WATER ; BOHAI SEA ; OXYGEN ; SOUTHERN
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
语种	英语
WOS记录号	WOS:000789565100001
资助机构	FINGBOYEL ; German Federal Ministry of Education and Research (BMBF)
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/31234]
专题	烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室
通讯作者	Tian, Shichao
作者单位	1.Shandong Univ, Inst Marine Sci & Technol, Qingdao, Peoples R China 2.Helmholtz Zent Hereon, Inst Carbon Cycles, Geesthacht, Germany 3.Chinese Acad Sci, Inst Soil Sci, Nanjing, Peoples R China 4.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai, Peoples R China 5.Univ Hamburg, Inst Geol, Dept Earth Syst Sci, Biogeochem Lab, Hamburg, Germany
推荐引用方式 GB/T 7714	Tian, Shichao,Gaye, Birgit,Tang, Jianhui,et al. Nitrate Regeneration and Loss in the Central Yellow Sea Bottom Water Revealed by Nitrogen Isotopes[J]. FRONTIERS IN MARINE SCIENCE,2022,9:19.
APA	Tian, Shichao.,Gaye, Birgit.,Tang, Jianhui.,Luo, Yongming.,Lahajnar, Niko.,...&Emeis, Kay-Christian.(2022).Nitrate Regeneration and Loss in the Central Yellow Sea Bottom Water Revealed by Nitrogen Isotopes.FRONTIERS IN MARINE SCIENCE,9,19.
MLA	Tian, Shichao,et al."Nitrate Regeneration and Loss in the Central Yellow Sea Bottom Water Revealed by Nitrogen Isotopes".FRONTIERS IN MARINE SCIENCE 9(2022):19.