DOI: 10.1016/j.epsl.2018.04.022
Scopus记录号: 2-s2.0-85046091584
论文题名: Biolabile ferrous iron bearing nanoparticles in glacial sediments
作者: Hawkings J.R. ; Benning L.G. ; Raiswell R. ; Kaulich B. ; Araki T. ; Abyaneh M. ; Stockdale A. ; Koch-Müller M. ; Wadham J.L. ; Tranter M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493 起始页码: 92
结束页码: 101
语种: 英语
英文关键词: Arctic
; biological pump
; export-productivity
; glaciers
; iron
; sediment
Scopus关键词: Biochemistry
; Glacial geology
; Glaciers
; Iron
; Nanoparticles
; Productivity
; Sea ice
; Sediments
; Arctic
; Biological pumps
; Glacial meltwater
; Glacial sediments
; Greenland Ice Sheet
; High-resolution imaging
; Marine environment
; Phytoplankton bloom
; Iron compounds
; arctic environment
; biological pump
; glacial deposit
; glacier
; ice cover
; ice sheet
; iceberg
; iron
; nanoparticle
; sediment chemistry
; Arctic
; Atlantic Ocean
; Greenland
; Greenland Ice Sheet
; Labrador Sea
英文摘要: Glaciers and ice sheets are a significant source of nanoparticulate Fe, which is potentially important in sustaining the high productivity observed in the near-coastal regions proximal to terrestrial ice cover. However, the bioavailability of particulate iron is poorly understood, despite its importance in the ocean Fe inventory. We combined high-resolution imaging and spectroscopy to investigate the abundance, morphology and valence state of particulate iron in glacial sediments. Our results document the widespread occurrence of amorphous and Fe(II)-rich and Fe(II)-bearing nanoparticles in Arctic glacial meltwaters and iceberg debris, compared to Fe(III)-rich dominated particulates in an aeolian dust sample. Fe(II) is thought to be highly biolabile in marine environments. Our work shows that glacially derived Fe is more labile than previously assumed, and consequently that glaciers and ice sheets are therefore able to export potentially bioavailable Fe(II)-containing nanoparticulate material to downstream ecosystems, including those in a marine setting. Our findings provide further evidence that Greenland Ice Sheet meltwaters may provide biolabile particulate Fe that may fuel the large summer phytoplankton bloom in the Labrador Sea, and that Fe(II)-rich particulates from a region of very high productivity downstream of a polar ice sheet may be glacial in origin. © 2018 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109877
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, University Road, Bristol, BS8 1SS, United Kingdom; German Research Center for Geosciences GFZ, Telegrafenberg, Department 4, Potsdam, 14473, Germany; Cohen Lab, School of Earth and Environment, Maths/Earth and Environment Building, University of Leeds, Leeds, LS2 9JT, United Kingdom; Department of Earth Sciences, Free University of Berlin, Berlin, 12249, Germany; Diamond Light Source, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
Recommended Citation:
Hawkings J.R.,Benning L.G.,Raiswell R.,et al. Biolabile ferrous iron bearing nanoparticles in glacial sediments[J]. Earth and Planetary Science Letters,2018-01-01,493