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    A carbon budget for a naturally iron fertilized bloom in the Southern Ocean

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    Article (946.6Kb)
    Table S1: Station number, position, region, and 100 m integrated chl-a, DON, POC, PON, and ΔNO3−. (79.5Kb)
    Table S2: 100 m 234Th fluxes, BSi:Th ratios in the >53 μm SAPS samples, and calculated 234Th-BSiex. (50Kb)
    Additional file information (7.773Kb)
    Date
    2011-07-08
    Author
    Morris, Paul J.  Concept link
    Sanders, Richard J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4738
    As published
    https://doi.org/10.1029/2010GB003780
    DOI
    10.1029/2010GB003780
    Keyword
     Silicon budget; CROZEX; POC; HNLC; Carbon export 
    Abstract
    Subantarctic islands in the high-nutrient, low-chlorophyll (HNLC) Southern Ocean are natural sources of iron and stimulate blooms in their proximity, such as the one observed close to the Crozet Islands (52°E, 46°S). During 2004/2005, particulate organic carbon (POC) export was measured using the 234Th technique in the Crozet bloom and compared with an HNLC control region. Initial results showed that iron release had no effect on daily POC export rates, thus any iron-driven enhancement in POC export was due to a longer export phase in the bloom region when compared to the control region. The duration of the export event was empirically estimated by closing the silicon budget, thus allowing seasonal POC export to be calculated by applying the export duration to the daily rates of POC export. This yields a seasonal estimate of POC export that is 3.6 times larger (range 1.9–7.1) in the iron-fertilized region than in the HNLC control region. These estimates of POC export were then compared to independent estimates of organic matter storage in the upper ocean, which are significant in both the HNLC and control regions. Overall, integrated POC export was significantly (approximately 50%) lower than estimated seasonal new production, the fraction of production that is supported by inputs of new nutrients. Finally, the sequestration efficiency, the numerical relationship between the supply of the limiting nutrient, iron, and the key ecosystem function of POC export at 100 m, is estimated to be 16,790 mol:mol.
    Description
    Author Posting. © American Geophysical Union, 2011. 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 25 (2011): GB3004, doi:10.1029/2010GB003780.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Global Biogeochemical Cycles 25 (2011): GB3004
     

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