DOI: 10.1038/ngeo1893
论文题名: Slow-spreading submarine ridges in the South Atlantic as a significant oceanic iron source
作者: Saito M.A. ; Noble A.E. ; Tagliabue A. ; Goepfert T.J. ; Lamborg C.H. ; Jenkins W.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 9 起始页码: 775
结束页码: 779
语种: 英语
Scopus关键词: deep sea
; dissolved inorganic matter
; global ocean
; hydrothermal activity
; hydrothermal vent
; iron
; manganese
; mid-ocean ridge
; nitrogen fixation
; numerical model
; primary production
; tracer
; Atlantic Ocean
; Atlantic Ocean (South)
; Brazil
; Namibia
; Pacific Ocean
; Pacific Ocean (Southeast)
英文摘要: Low levels of the micronutrient iron limit primary production and nitrogen fixation in large areas of the global ocean. The location and magnitude of oceanic iron sources remain uncertain, however, owing to a scarcity of data, particularly in the deep ocean. Although deep-sea hydrothermal vents along fast-spreading ridges have been identified as important contributors to the oceanic iron inventory, slow-spreading ridges, which contribute more than half of the submarine ridge-crest environment, are assumed to be less significant and remain relatively unexplored. Here, we present measurements of dissolved iron and manganese concentrations along a full-depth section in the South Atlantic Ocean, running from offshore of Brazil to Namibia. We detect a large dissolved iron-and manganese-rich plume over the slow-spreading southern Mid-Atlantic Ridge. Using previously collected measurements of helium-3 concentrations-a tracer of hydrothermal activity-we calculate the ratio of dissolved iron to hydrothermal helium in the plume waters and find that it is 80-fold higher than that reported for plume waters emanating from faster-spreading ridges in the southeastern Pacific. Only the application of a higher ratio in global ocean model simulations yields iron fluxes from these slow-spreading submarine ridges that are in line with our observations. We suggest that global iron contributions from hydrothermal vents are significantly higher than previously thought, owing to a greater contribution from slow-spreading regions. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106720
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Massachusetts Institute of Technology, Woods Hole Oceanographic Joint Program in Chemical Oceanography, Woods Hole, MA 02543, United States; Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, 4 Brownlow Street, Liverpool L69 3GP, United Kingdom; Southern Ocean Carbon and Climate Observatory, CSIR, Cape Town 7700, South Africa
Recommended Citation:
Saito M.A.,Noble A.E.,Tagliabue A.,et al. Slow-spreading submarine ridges in the South Atlantic as a significant oceanic iron source[J]. Nature Geoscience,2013-01-01,6(9)