The effect of Kuroshio Current on nitrate dynamics in the southern East China Sea revealed by nitrate isotopic composition

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	The effect of Kuroshio Current on nitrate dynamics in the southern East China Sea revealed by nitrate isotopic composition
	Wang, Wentao1,2,3 ; Yu, Zhiming1,2 ; Song, Xiuxian1,2 ; Wu, Zaixing 1,2; Yuan, Yongquan1,2 ; Zhou, Peng 1,2,3; Cao, Xihua1,2
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2016-09-01
卷号	121 期号:9 页码:7073-7087
关键词	East China Sea Kuroshio nitrate nitrogen isotope assimilation nitrification
英文摘要	In spring 2014 (May-June), in the southern East China Sea (ECS) and east of Taiwan, nutrient and isotope samples were collected and analyzed. Also, dissolved oxygen (DO), chlorophyll-a, and physical parameters were determined. The Kuroshio subsurface water intruded into the ECS and separated into two branches on the continental shelf: the nearshore Kuroshio branch current (NKBC) and the offshore Kuroshio branch current (OKBC). Nitrate concentration in the Kuroshio subsurface water slightly decreased east of Taiwan by assimilation and was supplied by upwelling currents northeast of Taiwan. The variations of DO, nitrate, and nitrogen isotopes in the bottom water showed that continuous nitrification occurred in the NKBC after intrusion into the ECS. This process might contribute to the hypoxia zone near the coast of Zhejiang Province, China. Our results also indicated that internal nitrogen cycles appeared in NKBC since the isotope fractionation ratio of oxygen and nitrogen ((18)epsilon:(15)epsilon) in NO2- was 1.40. The NO3- flux and budget were calculated in the NKBC via numerical simulations. It demonstrated that at least similar to 0.52 kmol NO3- .s(-1) was produced by nitrification from DH9 to DH5 transect, and similar to 0.11 kmol NO3- .s(-1) was consumed in the DH4 transect. Moreover, according to the Rayleigh model, primary production in most of southern ECS was supported by the intrusion of the Kuroshio subsurface water, causing 5 parts per thousand isotope fractionation. In some of nearshore stations which located in the northern investigated area, the assimilated nitrate was contributed from both the NKBC and coastal currents originated from the Changjiang diluted water.
收录类别	SCI
语种	英语
WOS记录号	WOS:000386913200029
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/136196]
专题	海洋研究所_海洋生态与环境科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Wentao,Yu, Zhiming,Song, Xiuxian,et al. The effect of Kuroshio Current on nitrate dynamics in the southern East China Sea revealed by nitrate isotopic composition[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2016,121(9):7073-7087.
APA	Wang, Wentao.,Yu, Zhiming.,Song, Xiuxian.,Wu, Zaixing.,Yuan, Yongquan.,...&Cao, Xihua.(2016).The effect of Kuroshio Current on nitrate dynamics in the southern East China Sea revealed by nitrate isotopic composition.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,121(9),7073-7087.
MLA	Wang, Wentao,et al."The effect of Kuroshio Current on nitrate dynamics in the southern East China Sea revealed by nitrate isotopic composition".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 121.9(2016):7073-7087.