Data_Sheet_1_The Effect of Particle Composition and Concentration on the Partitioning Coefficient for Mercury in Three Ocean Basins.docx

The downward flux of sinking particles is a prominent Hg removal and redistribution process in the ocean; however, it is not well-constrained. Using data from three U.S. GEOTRACES cruises including the Pacific, Atlantic, and Arctic Oceans, we examined the mercury partitioning coefficient, K d , in t...

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Bibliographic Details
Main Authors: Xinyun Cui, Carl H. Lamborg, Chad R. Hammerschmidt, Yang Xiang, Phoebe J. Lam
Format: Dataset
Language:unknown
Published: 2021
Subjects:
Environmental Chemistry
Geochemistry
Environmental Rehabilitation (excl. Bioremediation)
Water Treatment Processes
Environmental Technologies
partitioning
GEOTRACES
particle concentration
particle composition
marine particles
mercury
Arctic
Pacific
Online Access:https://doi.org/10.3389/fenvc.2021.660267.s001
https://figshare.com/articles/dataset/Data_Sheet_1_The_Effect_of_Particle_Composition_and_Concentration_on_the_Partitioning_Coefficient_for_Mercury_in_Three_Ocean_Basins_docx/14595219
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Summary:The downward flux of sinking particles is a prominent Hg removal and redistribution process in the ocean; however, it is not well-constrained. Using data from three U.S. GEOTRACES cruises including the Pacific, Atlantic, and Arctic Oceans, we examined the mercury partitioning coefficient, K d , in the water column. The data suggest that the K d varies widely over three ocean basins. We also investigated the effect of particle concentration and composition on K d by comparing the concentration of small-sized (1–51 μm) suspended particulate mass (SPM) as well as its compositional fractions in six different phases to the partitioning coefficient. We observed an inverse relationship between K d and suspended particulate mass, as has been observed for other metals and known as the “particle concentration effect,” that explains much of the variation in K d . Particulate organic matter (POM) and calcium carbonate (CaCO 3 ) dominated the Hg partitioning in all three ocean basins while Fe and Mn could make a difference in some places where their concentrations are elevated, such as in hydrothermal plumes. Finally, our estimated Hg residence time has a strong negative correlation with average log bulk K d , indicating that K d has significant effect on Hg residence time.

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