DOI: 10.1002/grl.50296
论文题名: Iron speciation in aerosol dust influences iron bioavailability over glacial-interglacial timescales
作者: Spolaor A. ; Vallelonga P. ; Cozzi G. ; Gabrieli J. ; Varin C. ; Kehrwald N. ; Zennaro P. ; Boutron C. ; Barbante C.
刊名: Geophysical Research Letters
ISSN: 0094-9153
EISSN: 1944-8884
出版年: 2013
卷: 40, 期: 8 起始页码: 1618
结束页码: 1623
语种: 英语
英文关键词: bioavailability
; iron
; Southern Ocean
; Talos Dome
Scopus关键词: Atmospheric carbon dioxide
; bioavailability
; Climatic periods
; Iron bioavailability
; Last Glacial Maximum
; Organic complexation
; Primary production
; Southern ocean
; Aerosols
; Atmospheric chemistry
; Biochemistry
; Carbon dioxide
; Domes
; Dust
; Finite difference method
; Glacial geology
; Iron
; Phytoplankton
; Iron compounds
; aerosol
; bioavailability
; carbon dioxide
; carbon sequestration
; drawdown
; glacial-interglacial cycle
; ice cover
; iron
; nutrient uptake
; phytoplankton
; primary production
; speciation (chemistry)
; timescale
; Antarctica
; East Antarctica
; Talos Dome
英文摘要: Iron deposition influences primary production and oceanic sequestration of atmospheric carbon dioxide (CO2). Iron has two oxidation states, Fe(II) and Fe(III), with Fe(II) being more soluble and available for oceanic phytoplankton uptake. The past proportions of soluble iron in aerosol dust remain unknown. Here we present iron speciation (Fe2+ and Fe 3+) in the Antarctic Talos Dome ice core over millennial time scales. We demonstrate that iron speciation over the last 55 kyr is linked to increasing quantities of fine dust (FD) (0.7-5 μm) and intensified long-range dust transport. We propose that Fe(II) and Fe2+ production is principally enhanced in FD by photoreduction, although pH and organic complexation may also contribute to the speciation dynamics. During the Last Glacial Maximum, Fe2+ concentrations in dust increased by up to seven times more than interglacial levels, while Fe3+ only doubled. Cold and dusty climatic periods may increase the percentage of biologically available Fe(II) and Fe2+ deposited in the nutrient-limited Southern Ocean, allowing greater phytoplankton uptake and perhaps increased CO2 drawdown. Key Points The first work recording iron speciation in ice core in glacial-interglacial Importance of iron species in the bioavailability of iron It demonstrates that the addition of iron species results in CO2 drawdown. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877959313&doi=10.1002%2fgrl.50296&partnerID=40&md5=116a2a8783b507bdcbc60e9ecb3941ed
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6417
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Science, University of Siena, Siena, Italy
Recommended Citation:
Spolaor A.,Vallelonga P.,Cozzi G.,et al. Iron speciation in aerosol dust influences iron bioavailability over glacial-interglacial timescales[J]. Geophysical Research Letters,2013-01-01,40(8).