Isotopic constraints on biogeochemical cycling of copper in the ocean

Shotaro Takano (), Masaharu Tanimizu, Takafumi Hirata and Yoshiki Sohrin
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Shotaro Takano: Institute for Chemical Research, Kyoto University
Masaharu Tanimizu: Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
Takafumi Hirata: Laboratory for Planetary Sciences, Kyoto University
Yoshiki Sohrin: Institute for Chemical Research, Kyoto University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Trace elements and their isotopes are being actively studied as powerful tracers in the modern ocean and as proxies for the palaeocean. Although distributions and fractionations have been reported for stable isotopes of dissolved Fe, Cu, Zn and Cd in the ocean, the data remain limited and only preliminary explanations have been given. Copper is of great interest because it is either essential or toxic to organisms and because its distribution reflects both biological recycling and scavenging. Here we present new isotopic composition data for dissolved Cu (δ65Cu) in seawater and rainwater. The Cu isotopic composition in surface seawater can be explained by the mixing of rain, river and deep seawater. In deep seawater, δ65Cu becomes heavier with oceanic circulation because of preferential scavenging of the lighter isotope (63Cu). In addition, we constrain the marine biogeochemical cycling of Cu using a new box model based on Cu concentrations and δ65Cu.

Date: 2014
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DOI: 10.1038/ncomms6663

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