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    Particle fluxes associated with mesoscale eddies in the Sargasso Sea

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    Buesseler et al EDDIES revSept 25.pdf (1.090Mb)
    Date
    2007-09-25
    Author
    Buesseler, Ken O.  Concept link
    Lamborg, Carl H.  Concept link
    Cai, Pinghe  Concept link
    Escoube, Raphaelle  Concept link
    Johnson, Rodney J.  Concept link
    Pike, Steven M.  Concept link
    Masqué, Pere  Concept link
    McGillicuddy, Dennis J.  Concept link
    Verdeny, Elisabet  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2349
    As published
    https://doi.org/10.1016/j.dsr2.2008.02.007
    Keyword
     Oceanic eddies; Particle flux; Thorium-234 
    Abstract
    We examined the impact of a cyclonic eddy and mode-water eddy on particle flux in the Sargasso Sea. The primary method used to quantify flux was based upon measurements of the natural radionuclide, 234Th, and these flux estimates were compared to results from sediment traps in both eddies, and a 210Po/210Pb flux method in the mode-water eddy. Particulate organic carbon (POC) fluxes at 150m ranged from 1 to 4 mmol C m-2 d-1 and were comparable between methods, especially considering differences in integration times scales of each approach. Our main conclusion is that relative to summer mean conditions at the Bermuda Atlantic Time-series Study (BATS) site, eddy-driven changes in biogeochemistry did not enhance local POC fluxes during this later, more mature stage of the eddy life cycle (>6 months old). The absence of an enhancement in POC flux puts a constraint on the timing of higher POC flux events, which are thought to have caused the local O2 minima below each eddy, and must have taken place >2 months prior to our arrival. The mode-water eddy did enhance preferentially diatom biomass in its center where we estimated a factor of 3 times higher biogenic Si flux than the BATS summer average. An unexpected finding in the highly depth resolved 234Th data sets are narrow layers of particle export and remineralization within the eddy. In particular, a strong excess 234Th signal is seen below the deep chlorophyll maxima which we attribute to remineralization of 234Th bearing particles. At this depth below the euphotic zone, de novo particle production in the euphotic zone has stopped, yet particle remineralization continues via consumption of labile sinking material by bacteria and/or zooplankton. These data suggest that further study of processes in ocean layers is warranted not only within, but below the euphotic zone.
    Description
    Author Posting. © Elsevier B.V., 2008. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 55 (2008): 1426-1444, doi:10.1016/j.dsr2.2008.02.007.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Buesseler, Ken O., Lamborg, Carl H., Cai, Pinghe, Escoube, Raphaelle, Johnson, Rodney J., Pike, Steven M., Masqué, Pere, McGillicuddy, Dennis J., Verdeny, Elisabet, "Particle fluxes associated with mesoscale eddies in the Sargasso Sea", 2007-09-25, https://doi.org/10.1016/j.dsr2.2008.02.007, https://hdl.handle.net/1912/2349
     

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