气候变化领域集成服务门户(CCPortal): The Internal Cycling of Zinc in the Ocean

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DOI	10.1029/2018GB006045
	The Internal Cycling of Zinc in the Ocean
	Roshan S.; DeVries T.; Wu J.; Chen G.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1833
结束页码	1849
卷号	32 期号:12
英文摘要	The internal cycling of zinc (Zn) in the ocean has been a longstanding mystery. Particularly, puzzling is the strong correlation between Zn and silicate (SiO 4 4− ), but not phosphate (PO 4 3− ), even though Zn is involved with cell functions that regulate PO 4 3− uptake and are unrelated to SiO 4 4− uptake. To help solve this mystery, we use an artificial neural network to produce global maps of dissolved Zn, and then use a diagnostic model to infer rates of uptake and regeneration for Zn, SiO 4 4− , and PO 4 3− . We find that plankton in the Southern Ocean account for 62 (±32)% of global Zn uptake. The plankton Zn:PO 4 3− uptake ratio increases by more than tenfold from the low latitudes to the Southern Ocean, a much larger range than expected from culture studies, suggesting controls from factors such as iron availability. Reconstruction of particulate Zn (PZn), phosphorus (PP), and biogenic silica (PSi) fluxes reveals that PZn remineralizes like PP, and not like PSi. However, a small flux of PZn into the deep ocean is not matched by an equivalent flux of PP, which is likely due to the combined effects of desorption of scavenged Zn and the input of hydrothermal Zn in the deep ocean. This small difference in the remineralization of PZn and PP, combined with the patterns of surface uptake, eliminates the correlation between Zn and PO 4 3− in the deep ocean and causes a tight correlation between Zn and SiO 4 4− . This coincidental correlation cannot be expected to hold for past and future states of the ocean. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	diagnostic modeling; dissolved Zn; internal cycling; uptake stoichiometry; Zn-Si correlation
语种	英语
scopus关键词	artificial neural network; biogenic material; correlation; desorption; dissolved matter; modeling; nutrient cycling; phosphate; phosphorus; remineralization; silica; silicate; stoichiometry; zinc; Southern Ocean
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129765
作者单位	Department of Geography, University of California, Santa Barbara, CA, United States; Earth Research Institute, University of California, Santa Barbara, CA, United States; College of Life Science and Oceanography, Shenzhen University, Shenzhen, China; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Coral Gables, FL, United States
推荐引用方式 GB/T 7714	Roshan S.,DeVries T.,Wu J.,et al. The Internal Cycling of Zinc in the Ocean[J],2018,32(12).
APA	Roshan S.,DeVries T.,Wu J.,&Chen G..(2018).The Internal Cycling of Zinc in the Ocean.Global Biogeochemical Cycles,32(12).
MLA	Roshan S.,et al."The Internal Cycling of Zinc in the Ocean".Global Biogeochemical Cycles 32.12(2018).