Nitrogen fixation driven by mesoscale eddies and the Kuroshio Current in the northern South China Sea and the East China Sea

IOCAS-IR

	Nitrogen fixation driven by mesoscale eddies and the Kuroshio Current in the northern South China Sea and the East China Sea
	Liuyang Li ; Chao Wu ; Jun Sun ; Shuqun Song ; Changling Ding ; Danyue Huang ; Laxman Pujari
发表期刊	Acta Oceanologica Sinica
ISSN	0253-505X
	2020-12-15
出版年	2020
卷号	v.39 期号:12 页码:34-45
文献类型	CNKI期刊论文
摘要	N_2 fixation rates(NFR, in terms of N) in the northern South China Sea(nSCS) and the East China Sea(ECS) were measured using the acetylene reduction assay in summer and winter, 2009. NFR of the surface water ranged from 1.14 nmol/(L·d) to 10.40 nmol/(L·d)(average at(4.89±3.46) nmol/(L·d), n=11) in summer and 0.74 nmol/(L·d) to 29.45 nmol/(L·d)(average at(7.81±8.50) nmol/(L·d), n=15) in winter. Significant spatio-temporal heterogeneity emerged in our study: the anticyclonic eddies(AE)(P<0.01) and the Kuroshio Current(KC)(P<0.05) performed significantly higher NFR than that in the cyclonic eddies or no-eddy area(CEONE), indicating NFR was profoundly influenced by the physical process of the Kuroshio and mesoscale eddies. The depth-integrated N_2 fixation rates(INF, in terms of N) ranged from 52.4 μmol/(m~2·d) to 905.2 μmol/(m~2·d)(average at(428.9±305.5)μmol/(m~2·d), n=15) in the winter. The contribution of surface NFR to primary production(PP) ranged from 1.7%to 18.5% in the summer, and the mean contribution of INF to new primary production(NPP) in the nSCS and ECS were estimated to be 11.0% and 36.7% in the winter. The contribution of INF to NPP(3.0%–93.9%) also decreased from oligotrophic sea toward the eutrophic waters affected by runoffs or the CEONE. Furthermore, we observed higher contributions compared to previous studies, revealing the vital roles of nitrogen fixation in sustaining the carbon pump of the nSCS and ECS.
关键词	nitrogen fixation primary production anticyclonic eddies Kuroshio acetylene reduction assay
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;
CNKI专题名称	海洋学;
分类号	P73
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	The National Natural Science Foundation of China under contract Nos 41876134 and 41406155 ; the University Innovation Team Training Program for Tianjin under contract No. TD12-5003 ; the Tianjin 131 Innovation Team Program under contract No. 20180314 ; the Changjiang Scholar Program of Chinese Ministry of Education to Jun Sun under contract No. T2014253 ; the Tianjin Municipal Education Commission Research Program under contract No. 2017KJ012 ; the Open Fund of Tianjin Key Laboratory of Marine Resources and Chemistry under contract Nos 201506 and 201801
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/187930
专题	中国科学院海洋研究所
作者单位	1.SchoolofLifeSciencesandBiotechnology,ShanghaiJiaoTongUniversity 2.ResearchCentreforIndianOceanEcosystem,TianjinUniversityofScience&Technology 3.CollegeofMarineScienceandTechnology,ChinaUniversityofGeosciences(Wuhan) 4.InstituteofOceanology,ChineseAcademyofSciences 5.CollegeofBiotechnology,TianjinUniversityofScience&Technology 6.CollegeofFoodEngineeringandBiotechnology,TianjinUniversityofScience&Technology
推荐引用方式 GB/T 7714	Liuyang Li,Chao Wu,Jun Sun,et al. Nitrogen fixation driven by mesoscale eddies and the Kuroshio Current in the northern South China Sea and the East China Sea. 2020.