globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1746
论文题名:
Greenland meltwater as a significant and potentially bioavailable source of iron to the ocean
作者: Bhatia M.P.; Kujawinski E.B.; Das S.B.; Breier C.F.; Henderson P.B.; Charette M.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:4
起始页码: 274
结束页码: 278
语种: 英语
Scopus关键词: bioavailability ; concentration (composition) ; dust ; glacial environment ; global ocean ; global warming ; ice sheet ; iceberg ; iron ; meltwater ; open ocean ; primary production ; trace element ; Arctic ; Atlantic Ocean ; Atlantic Ocean (North) ; Greenland
英文摘要: The micronutrient iron is thought to limit primary productivity in large regions of the global ocean. Ice sheets and glaciers have been shown to deliver bioavailable iron to the coastal and open ocean in the form of sediment released from the base of icebergs and glacially derived dust. More direct measurements from glacial runoff are limited, but iron concentrations are thought to be in the nanomolar range. Here we present measurements of dissolved and particulate iron concentrations in glacial meltwater from the southwest margin of the Greenland ice sheet. We report micromolar concentrations of dissolved and particulate iron. Particulate iron concentrations were on average an order of magnitude higher than those of dissolved iron, and around 50% of this particulate iron was deemed to be potentially bioavailable, on the basis of experimental leaching. If our observations are scalable to the entire ice sheet, then the annual flux of dissolved and potentially bioavailable particulate iron to the North Atlantic Ocean would be approximately 0.3 Tg. This is comparable to dust-derived soluble iron inputs to the North Atlantic. We suggest that glacial runoff serves as a significant source of bioavailable iron to surrounding coastal oceans, which is likely to increase as melting of the Greenland ice sheet escalates under climate warming. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106826
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: MIT/WHOI Joint Program in Oceanography/Applied Ocean Sciences and Engineering, Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC V6T 1Z3, Canada

Recommended Citation:
Bhatia M.P.,Kujawinski E.B.,Das S.B.,et al. Greenland meltwater as a significant and potentially bioavailable source of iron to the ocean[J]. Nature Geoscience,2013-01-01,6(4)
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