DOI: 10.1002/2014GB004921
Scopus记录号: 2-s2.0-84916878304
论文题名: The impact of changing surface ocean conditions on the dissolution of aerosol iron
作者: Fishwick M ; P ; , Sedwick P ; N ; , Lohan M ; C ; , Worsfold P ; J ; , Buck K ; N ; , Church T ; M ; , Ussher S ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 11 起始页码: 1235
结束页码: 1250
语种: 英语
英文关键词: Biogeochemistry
; Climate change
; Iron
; Ligands, colloids
; Marine aerosols
Scopus关键词: aerosol composition
; air-sea interaction
; biogeochemistry
; climate change
; colloid
; dissolution
; iron
; ligand
; physicochemical property
; seawater
; solubility
; Atlantic Ocean
; Sargasso Sea
英文摘要: The proportion of aerosol iron (Fe) that dissolves in seawater varies greatly and is dependent on aerosol composition and the physicochemical conditions of seawater, which may change depending on location or be altered by global environmental change. Aerosol and surface seawater samples were collected in the Sargasso Sea and used to investigate the impact of these changing conditions on aerosol Fe dissolution in seawater. Our data show that seawater temperature, pH, and oxygen concentration, within the range of current and projected future values, had no significant effect on the dissolution of aerosol Fe. However, the source and composition of aerosols had the most significant effect on the aerosol Fe solubility, with the most anthropogenically influenced samples having the highest fractional solubility (up to 3.2%). The impact of ocean warming and acidification on aerosol Fe dissolution is therefore unlikely to be as important as changes in land usage and fossil fuel combustion. Our experimental results also reveal important changes in the size distribution of soluble aerosol Fe in solution, depending on the chemical conditions of seawater. Under typical conditions, the majority (77-100%) of Fe released from aerosols into ambient seawater existed in the colloidal (0.02-0.4 innodatamum) size fraction. However, in the presence of a sufficient concentration of strong Fe-binding organic ligands (10 nM) most of the aerosol-derived colloidal Fe was converted to soluble Fe (<0.02 μm). This finding highlights the potential importance of organic ligands in retaining aerosol Fe in a biologically available form in the surface ocean. ©2014. 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/77533
Appears in Collections: 气候变化事实与影响
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作者单位: School of Geography, Earth, and Environmental Sciences, University of Plymouth, Plymouth, United Kingdom; Ocean, Earth, and Atmospheric Sciences, Old Dominion University, Norfolk, VA, United States; Bermuda Institute of Ocean Sciences, St. George's, Bermuda; Now at College of Marine Science, University of South Florida, St. Petersburg, FL, United States; College of Earth, Ocean, and Environment, University of Delaware, Newark, DE, United States
Recommended Citation:
Fishwick M,P,, Sedwick P,et al. The impact of changing surface ocean conditions on the dissolution of aerosol iron[J]. Global Biogeochemical Cycles,2014-01-01,28(11)