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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, Zaixing1,2; Yuan, Yongquan1,2; Zhou, Peng1,2,3; Cao, Xihua1,2
2016-09-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume121Issue:9Pages:7073-7087
SubtypeArticle
AbstractIn 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.
KeywordEast China Sea Kuroshio Nitrate Nitrogen Isotope Assimilation Nitrification
DOI10.1002/2016JC011882
Indexed BySCI
Language英语
WOS IDWOS:000386913200029
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Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136196
Collection海洋生态与环境科学重点实验室
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
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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.
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