DOI: 10.1029/2018GB006045
论文题名: The Internal Cycling of Zinc in the Ocean
作者: Roshan S. ; DeVries T. ; Wu J. ; Chen G.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 12 语种: 英语
英文关键词: artificial neural network
; biogenic material
; correlation
; desorption
; dissolved matter
; modeling
; nutrient cycling
; phosphate
; phosphorus
; remineralization
; silica
; silicate
; stoichiometry
; zinc
; Southern Ocean
学科: diagnostic modeling
; dissolved Zn
; internal cycling
; uptake stoichiometry
; Zn-Si correlation
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160169
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Roshan S.,DeVries T.,Wu J.,et al. The Internal Cycling of Zinc in the Ocean[J]. Global Biogeochemical Cycles,2018-01-01,32(12)