On the marine geochemistry of nickel

Physics

Scientific paper

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Scientific paper

Nickel has been measured on four Geosecs profiles from the Atlantic and Pacific. The resulting distribution is oceanographically consistent: the concentration levels are over a factor of five lower than any previously reported. Values range from as low as 3 nmoles/kg in surface waters to 12 nmoles/kg in the deep North Pacific. The form of the Pacific profiles indicates that nickel is involved in the biogeochemical cycle and is regenerated both at shallow depths, like phosphate and in the deep waters like silicate. The oceanic residence time is ca. 10,000 years. While ferromanganese phases may be the ultimate sink for nickel they do not control its distribution in the water column.

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