气候变化领域集成服务门户(CCPortal): Spatial and Seasonal Variations of Stable Isotope Ratios of Particulate Organic Carbon and Nitrogen in the Surface Water of the Kuroshio

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DOI	10.1029/2021JC017175
	Spatial and Seasonal Variations of Stable Isotope Ratios of Particulate Organic Carbon and Nitrogen in the Surface Water of the Kuroshio
	Kodama T.; Nishimoto A.; Horii S.; Ito D.; Yamaguchi T.; Hidaka K.; Setou T.; Ono T.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	Seasonal stable isotope ratios of carbon and nitrogen (δ13C and δ15N) in the particulate organic matter (POM) of the euphotic layer were investigated around the Kuroshio from 2008 to 2019 (n = 474). Significant seasonality in POM δ13C and δ15N were observed in the coastal and offshore areas divided by the northern edge of the Kuroshio. Seasonal mean δ13C was highest during the summer (−23.2 ± 1.1‰ and −23.7 ± 1.1‰ in coastal and offshore areas, respectively) and lowest during the winter (−24.6 ± 0.8‰ and −25.0 ± 0.9‰ in coastal and offshore areas, respectively) in both areas. Seasonal mean δ15N exhibited different spatial variations. The mean δ15N value in the coastal area was the lowest during the winter (1.0 ± 1.9‰) and increased to a similar level (∼3‰) during the other three seasons. In contrast, δ15N in the offshore area near the surface decreased from the spring (2.5 ± 1.5‰) to the summer (1.2 ± 1.7‰). These spatial and seasonal differences in δ15N are significant in generalized linear models and the generalized additive models, and suggest that the nitrogen sources used in biological production differ between coastal and offshore areas and between seasons. Nitrate originating in deeper water and rivers is the main sources used for new production throughout the year in the coastal area. Contributions from atmospheric deposition and nitrogen fixation are significant in the offshore area during the summer, while nitrate originating in deeper water is main during winter, spring, and fall in the offshore area. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	diatoms; Kuroshio; N2 fixation; particulate organic matter; δ13C; δ15N
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/186381
作者单位	Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Yokohama, Japan; Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Yokohama, Japan; Nagasaki Field Station, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Yokohama, Japan
推荐引用方式 GB/T 7714	Kodama T.,Nishimoto A.,Horii S.,et al. Spatial and Seasonal Variations of Stable Isotope Ratios of Particulate Organic Carbon and Nitrogen in the Surface Water of the Kuroshio[J],2021,126(4).
APA	Kodama T..,Nishimoto A..,Horii S..,Ito D..,Yamaguchi T..,...&Ono T..(2021).Spatial and Seasonal Variations of Stable Isotope Ratios of Particulate Organic Carbon and Nitrogen in the Surface Water of the Kuroshio.Journal of Geophysical Research: Oceans,126(4).
MLA	Kodama T.,et al."Spatial and Seasonal Variations of Stable Isotope Ratios of Particulate Organic Carbon and Nitrogen in the Surface Water of the Kuroshio".Journal of Geophysical Research: Oceans 126.4(2021).