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    Iron in the Sargasso Sea (Bermuda Atlantic Time-series Study region) during summer : eolian imprint, spatiotemporal variability, and ecological implications

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    Article (702.4Kb)
    Additional information (3.208Kb)
    Table 1: Station-by-station data from the summer 2003 and spring 2004 cruises. (4.208Kb)
    Table 2: Total aerosol iron concentrations (in air) calculated from analysis of iron in aerosol filter samples from the summer 2003 and spring 2004 cruises. (418bytes)
    Date
    2005-10-13
    Author
    Sedwick, Peter N.  Concept link
    Church, Thomas M.  Concept link
    Bowie, Andrew R.  Concept link
    Marsay, Christopher M.  Concept link
    Ussher, Simon J.  Concept link
    Achilles, K. M.  Concept link
    Lethaby, Paul  Concept link
    Johnson, Rodney J.  Concept link
    Sarin, M. M.  Concept link
    McGillicuddy, Dennis J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/289
    As published
    https://doi.org/10.1029/2004GB002445
    DOI
    10.1029/2004GB002445
    Keyword
     Atmospheric deposition; Iron; Sargasso Sea 
    Abstract
    We report iron measurements for water column and aerosol samples collected in the Sargasso Sea during July-August 2003 (summer 2003) and April-May 2004 (spring 2004). Our data reveal a large seasonal change in the dissolved iron (dFe) concentration of surface waters in the Bermuda Atlantic Time-series Study region, from ∼1–2 nM in summer 2003, when aerosol iron concentrations were high (mean 10 nmol m−3), to ∼0.1–0.2 nM in spring 2004, when aerosol iron concentrations were low (mean 0.64 nmol m−3). During summer 2003, we observed an increase of ∼0.6 nM in surface water dFe concentrations over 13 days, presumably due to eolian iron input; an estimate of total iron deposition over this same period suggests an effective solubility of 3–30% for aerosol iron. Our summer 2003 water column profiles show potentially growth-limiting dFe concentrations (0.02–0.19 nM) coinciding with a deep chlorophyll maximum at 100–150 m depth, where phytoplankton biomass is typically dominated by Prochlorococcus during late summer.
    Description
    Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 19 (2005): GB4006, doi:10.1029/2004GB002445.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Global Biogeochemical Cycles 19 (2005): GB4006
     

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