气候变化领域集成服务门户(CCPortal): Evaluation of Silicic Acid Sources for Spring Diatom Blooms on the Continental Shelf: Insights FromStable Silicon Isotopes in the East China Sea

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DOI	10.1029/2019JC015478
	Evaluation of Silicic Acid Sources for Spring Diatom Blooms on the Continental Shelf: Insights FromStable Silicon Isotopes in the East China Sea
	Zhang A.; Zhang J.; Liu S.; Xuan J.; Zhu Z.
发表日期	2020
ISSN	21699275
卷号	125 期号:2
英文摘要	The concentration of dissolved silicic acid (DSi) and its isotopic composition (δ30Si(OH)4) were determined for the East China Sea (ECS) shelf in the spring season with high spatial resolution. DSi concentrations and δ30Si(OH)4 values ranged from 1.3 to 116.5 μM and +0.85‰ to +2.53‰, respectively. An enrichment of 30Si was observed in most surface-water samples compared with bottom waters. Several shallow-water stations at water depths of <20 m reflected the overall control of biological utilization of DSi and regeneration of DSi from biogenic silica (BSi) on the distribution of δ30Si(OH)4 values. A seasonal difference in δ30Si(OH)4 values was observed in the euphotic zone of shelf waters, which is attributed mainly to continuous consumption of DSi in enhanced diatom blooms. The major water masses influencing the ECS shelf were characterized with distinct DSi concentrations and isotopic compositions. Using Si isotopic constraints, modeling of δ30Si(OH)4 values implied that utilization of DSi in the ECS occurred as if in a steady-state mode. Riverine input was the major DSi source for the surface waters of inner-shelf areas, as well as part of the middle- and outer-shelf surface waters near the Changjiang River estuary. Upwelled Kuroshio Subsurface Water from the shelf break supported diatom growth in middle-shelf surface waters. Taiwan Strait Warm Water and Kuroshio Surface Water were relatively oligotrophic, and their influence was confined to waters near the Taiwan Strait and the outer shelf and slope areas. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	diatom blooms; dissolved silicic acid; East China Sea; silicon isotopes
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/187002
作者单位	State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China; Now at Key Laboratory of Marine Ecosystem Dynamics, Second Institue of Oceanography, Ministry of Natural Resources, Hangzhou, China; Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China/Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
推荐引用方式 GB/T 7714	Zhang A.,Zhang J.,Liu S.,et al. Evaluation of Silicic Acid Sources for Spring Diatom Blooms on the Continental Shelf: Insights FromStable Silicon Isotopes in the East China Sea[J],2020,125(2).
APA	Zhang A.,Zhang J.,Liu S.,Xuan J.,&Zhu Z..(2020).Evaluation of Silicic Acid Sources for Spring Diatom Blooms on the Continental Shelf: Insights FromStable Silicon Isotopes in the East China Sea.Journal of Geophysical Research: Oceans,125(2).
MLA	Zhang A.,et al."Evaluation of Silicic Acid Sources for Spring Diatom Blooms on the Continental Shelf: Insights FromStable Silicon Isotopes in the East China Sea".Journal of Geophysical Research: Oceans 125.2(2020).