DOI: 10.1002/gbc.20056
Scopus记录号: 2-s2.0-84887544344
论文题名: Impact of atmospheric deposition on the contrasting iron biogeochemistry of the North and South Atlantic Ocean
作者: Ussher S ; J ; , Achterberg E ; P ; , Powell C ; , Baker A ; R ; , Jickells T ; D ; , Torres R ; , Worsfold P ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 1096
结束页码: 1107
语种: 英语
英文关键词: aluminum
; Atlantic Ocean
; atmospheric deposition
; iron
Scopus关键词: Atlantic Ocean
; Atmospheric depositions
; Atmospheric inputs
; Biological recycling
; Carbon and nitrogen
; Iron biogeochemistries
; Subtropical regions
; Upper water column
; Aluminum
; Atmospheric chemistry
; Biogeochemistry
; Deposition
; Meteorological problems
; Oceanography
; Residence time distribution
; Surface waters
; Tropics
; Iron
; atmospheric deposition
; biogeochemistry
; estimation method
; gyre
; iron
; residence time
; vertical mixing
; water column
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (South)
英文摘要: Dissolved iron (dFe) distributions and atmospheric and vertical subduction fluxes of dFe were determined in the upper water column for two meridional transects of the Atlantic Ocean. The data demonstrate the disparity between the iron biogeochemistry of the North and South Atlantic Ocean and show well-defined gradients of size fractionated iron species in surface waters between geographic provinces. The highest dFe and lowest mixed layer residence times (0.4-2.5 years) were found in the northern tropical and subtropical regions. In contrast, the South Atlantic Gyre had lower dFe concentrations (<0.4 nM) and much longer residence times (>5 years), presumably due to lower atmospheric inputs and more efficient biological recycling of iron in this region. Vertical input fluxes of dFe to surface waters ranged from 20 to 170 nmol m-2 d-1 in the North Atlantic and tropical provinces, whereas average fluxes of 6-13 nmol m-2 d-1 were estimated for the South Atlantic. Our estimates showed that the variable dFe distribution over the surface Atlantic (<0.1-2.0 nM) predominantly reflected atmospheric Fe deposition fluxes (>50% of total vertical Fe flux to surface waters) rather than upwelling or vertical mixing. This demonstrates the strength of the connection between land-derived atmospheric Fe fluxes and the biological cycling of carbon and nitrogen in the Atlantic Ocean. ©2013. 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/77553
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 PL4 8AA, United Kingdom; Bermuda Institute of Ocean Sciences, Ferry Reach, St. George's, Bermuda; National Oceanography Centre, Southampton, University of Southampton, Southampton, United Kingdom; Laboratory for Global Marine and Atmospheric Chemistry, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Plymouth Marine Laboratory, Plymouth, United Kingdom
Recommended Citation:
Ussher S,J,, Achterberg E,et al. Impact of atmospheric deposition on the contrasting iron biogeochemistry of the North and South Atlantic Ocean[J]. Global Biogeochemical Cycles,2013-01-01,27(4)