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- W2062783188 abstract "The redox-sensitive trace metal manganese (Mn) is an important electron donor and acceptor in aquatic environments. In stratified basins, the transformation between dissolved Mn2 +, 3 + and particulate Mn(III/IV) oxides constitutes the “manganese pump” at the redoxcline, which separates the oxic surface from anoxic bottom waters. In addition to fluxes of dissolved components and reaction rates, accurate estimates of the sinking velocities of authigenic Mn oxides (MnOx) are an important prerequisite to balance and model such euxinic systems. However, models describing biogeochemical cycles suffer from the lack of measured particle sinking velocities and instead must rely on values calculated according to Stokes' law or on estimates derived from budget calculations. Here we present the first stationary sinking velocities of authigenic MnOx particles from the pelagic redoxclines of the currently anoxic Landsort and Gotland Deeps (Baltic Sea). Sinking velocities were determined on board ship by using high-resolution backlit imaging (shadowgraphy) and manual particle tracking. Within the typical size range of MnOx particles (2–20 μm), the average sinking velocity of 1972 particles was determined to be 0.76 m d− 1, distinctly lower than the values calculated according to Stokes' law and those used in various models. This difference could be attributed to the observed star-shaped structure of the MnOx particles, which was far away from a spherical shape, and to the embedment of the particles in a complex organic matrix, which significantly modified their density and consequently their sinking velocity." @default.
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- W2062783188 date "2014-03-01" @default.
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- W2062783188 title "Stationary sinking velocity of authigenic manganese oxides at pelagic redoxclines" @default.
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- W2062783188 doi "https://doi.org/10.1016/j.marchem.2014.01.008" @default.
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