Stoichiometry among bioactive trace metals in seawater on the Bering Sea shelf |
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| Authors: | Abigail Parcasio Cid Syouhei Urushihara Tomoharu Minami Kazuhiro Norisuye Yoshiki Sohrin |
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| Institution: | (1) Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; |
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| Abstract: | The distribution of Al, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb in seawater was investigated on the Bering Sea shelf (56–64°N,
165–169°W) in September 2000. The unfiltered and filtered seawater samples were used for determination of total dissolvable
(TD) and dissolved (D) metals (M), respectively. The TD-M concentrations were generally higher than in the Pacific Ocean.
TD-Cd was highest in deep water of the outer shelf domain and dominated by dissolved species. The other TD-M were highest
at stations close to the Yukon River delta and had higher fractions of labile particulate (LP) species that were obtained
as the difference between TD-M and D-M. Dissolved Al, Ni, and Cu were characterized by input from the Yukon River. Dissolved
Mn and Co showed maximums on the bottom of the coastal domain, suggesting influence of sedimentary Mn reduction. The correlations
of D-Zn, D-Cd, and macronutrients indicated their distributions were largely controlled through uptake by microorganisms and
remineralization from settling particles. All these three processes (river input, sedimentary reduction, and biogeochemical
cycle) had an influence on the distribution of D-Fe. D-Pb was fairly uniformly distributed in the study area. The stoichiometry
of D-M in the Bering Sea shelf showed enrichment of Co and Pb and depletion of Ni, Cu, Zn, and Cd compared with that in the
North Pacific. The LP-M/LP-Al ratio revealed significant enrichment of the other eight metals relative to their crustal abundance,
suggesting importance of formation of Fe–Mn oxides and adsorption of trace metals on the oxides. |
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