DOI: 10.1029/2012GB004427
Scopus记录号: 2-s2.0-84878913172
论文题名: Basin scale survey of marine humic fluorescence in the Atlantic: Relationship to iron solubility and H2O2
作者: Heller M ; I ; , Gaiero D ; M ; , Croot P ; L
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 1 起始页码: 88
结束页码: 100
语种: 英语
英文关键词: Atlantic Meridional Transect
; Atlantic Ocean
; Humic Fluorescence
; Iron Solubility
; Iron Speciation
; PARAFAC
Scopus关键词: Atlantic Meridional Transect
; Atlantic Ocean
; Iron solubilities
; Iron speciations
; PARAFAC
; Fluorescence
; Iron
; Ligands
; Redox reactions
; Seawater
; Solubility
; Iron compounds
; biogeochemical cycle
; dissolved organic matter
; euphotic zone
; fluorescence
; humic acid
; hydrogen peroxide
; iron
; nutrient limitation
; solubilization
; surface water
; Atlantic Ocean
英文摘要: Iron (Fe) is a limiting nutrient for phytoplankton productivity in many different oceanic regions. A critical aspect underlying iron limitation is its low solubility in seawater as this controls the distribution and transport of iron through the ocean. Processes which enhance the solubility of iron in seawater, either through redox reactions or organic complexation, are central to understanding the biogeochemical cycling of iron. In this work we combined iron solubility measurements with parallel factor (PARAFAC) data analysis of Coloured Dissolved Organic Matter (CDOM) fluorescence along a meridional transect through the Atlantic (PS ANT XXVI-4) to examine the hypothesis that marine humic fluorescence is a potential proxy for iron solubility in the surface ocean. PARAFAC analysis revealed 4 components (C1-4), two humic like substances (C2&4) and two protein-like (C1&3). Overall none of the 4 components were significantly correlated with iron solubility, though humic-like components were weakly correlated with iron solubility in iron replete waters. Our analysis suggests that the ligands responsible for maintaining iron in solution in the euphotic zone are sourced from both remineralisation processes and specific ligands produced in response to iron stress and are not easily related to bulk CDOM properties. The humic fluorescence signal was sharply attenuated in surface waters presumably most likely due to photo bleaching, though there was only a weak correlation with the transient photo product H 2O2, suggesting longer lifetimes in the photic zone for the fluorescent components identified here. ©2012. 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/77632
Appears in Collections: 气候变化事实与影响
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作者单位: Helmholtz Centre for Ocean Research Kiel (GEOMAR), FB2 Marine Biogeochemistry, Chemical Oceanography, Kiel, Germany; CICTERRA/Universidad Nacional de Còrdoba, Chemistry Department, Còrdoba, Argentina; Earth and Ocean Sciences, School of Natural Sciences, National University of Ireland Galway (NUI-Galway), Galway, Ireland; Department of Biological Sciences, University of Southern California, 825 Bloom Walk ACB 401, Los Angeles, CA 90089, United States
Recommended Citation:
Heller M,I,, Gaiero D,et al. Basin scale survey of marine humic fluorescence in the Atlantic: Relationship to iron solubility and H2O2[J]. Global Biogeochemical Cycles,2013-01-01,27(1)