The benthic cycle of copper: Evidence from sediment trap experiments in the eastern tropical North Pacific Ocean

Details The benthic cycle of copper: Evidence from sediment trap experiments in the eastern tropical North Pacific Ocean The benthic cycle of copper: Evidence from sediment trap experiments in the eastern tropical North Pacific Ocean

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1535f&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 50, Issue 7, p. 1535-1543.

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Scientific paper

The benthic fluxes of 24 elements and components are calculated from sediment trap fluxes and sediment accumulation rates at MANOP sites H and M in the eastern tropical North Pacific Ocean. In this paper, we focus our discussion on our data for copper. Benthic flux estimates for copper are 0.7 and 1.4 nmol/cm2/yr at H and M, respectively. These results compare well with estimates from another trap deployment in the Galapagos and modeling of pprewater and water column concentration data by other authors. Partitioning of near-bottom Cu flux indicates that the two sites receive similar amounts of primary Cu flux (flux from upper water column) and resuspended Cu flux. Only the site located on the East Pacific Rise (Site M) shows any input of hydrothermal Cu. At Site M, 35% of the near-bottom flux is due to some source other than primary, resuspended, or hydrothermal flux. We speculate that dissolved Cu from the sediments is readsorbed onto particles near the bottom at this site.Sequential leaching of trap material indicates that the flux of Cu associated with organic matter, using an operational definition, ranges from 56% to 84% of the trap material. This fraction of the total Cu increases with depth in the water column, probably through scavenging.

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