Physics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..46..361k&link_type=abstract
Earth and Planetary Science Letters, Volume 46, Issue 3, p. 361-384.
Physics
34
Scientific paper
This report presents the vertical distributions of ``total dissolvable manganese'' at 13 stations in the Pacific. Manganese concentrations vary with depth in a unique way. There is commonly a maximum concentration at the surface and a minimum at the top of the thermocline. At stations where the oxygen in the oxygen minimum falls below 100 μmol/kg, there is a manganese maximum in the oxygen minimum. At stations where the oxygen minimum is so intense that nitrate reduction occurs, especially high manganese concentrations are observed in the zone of nitrate reduction. This maximum in the O2 minimum is believed to originate either as reduction of Mn oxides in nearshore sediments and subsequent advection or by seawater equilibrium with a metastable oxide similar to hausmannite (Mn3O4). Surface water values range from about 3 to about 0.3 nmol/kg. The surface concentrations show a general correlation with 210 Pb, suggesting that the major source of manganese to the surface waters of the Pacific is desorption from atmospheric particulates. The residence time of Mn in surface waters is 5 to 25 years.
Bender Michael L.
Klinkhammer Gary P.
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