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    Dissolved zinc in the subarctic North Pacific and Bering Sea : its distribution, speciation, and importance to primary producers

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    2010GB004004.pdf (756.3Kb)
    Date
    2012-05-12
    Author
    Jakuba, Rachel W.  Concept link
    Saito, Mak A.  Concept link
    Moffett, James W.  Concept link
    Xu, Yan  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5211
    As published
    https://doi.org/10.1029/2010GB004004
    DOI
    10.1029/2010GB004004
    Keyword
     North; Pacific; Diatoms; Speciation; Zinc 
    Abstract
    The eastern subarctic North Pacific, an area of high nutrients and low chlorophyll, has been studied with respect to the potential for iron to control primary production. The geochemistry of zinc, a critical micronutrient for diatoms, is less well characterized. Total zinc concentrations and zinc speciation were measured in near-surface waters on transects across the subarctic North Pacific and across the Bering Sea. Total dissolved zinc concentrations in the near-surface ranged from 0.10 nmol L−1 to 1.15 nmol L−1 with lowest concentrations in the eastern portions of both the North Pacific and Bering Sea. Dissolved zinc speciation was dominated by complexation to strong organic ligands whose concentration ranged from 1.1 to 3.6 nmol L−1 with conditional stability constants (K′ZnL/Zn′) ranging from 109.3 to 1011.0. The importance of zinc to primary producers was evaluated by comparison to phytoplankton pigment concentrations and by performing a shipboard incubation. Zinc concentrations were positively correlated with two pigments that are characteristic of diatoms. At one station in the North Pacific, the addition of 0.75 nmol L−1 zinc resulted in a doubling of chlorophyll after 4 days.
    Description
    Author Posting. © American Geophysical Union, 2012. 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 26 (2012): GB2015, doi:10.1029/2010GB004004.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Global Biogeochemical Cycles 26 (2012): GB2015
     

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