Manganese cycling in northeast Pacific waters

Details Manganese cycling in northeast Pacific waters Manganese cycling in northeast Pacific waters

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..51..266m&link_type=abstract

Earth and Planetary Science Letters, Volume 51, Issue 2, p. 266-274.

Physics

11

Scientific paper

Particles trapped at depths of 35, 65, 150, 500, 750 and 1500 m in nearshore Californica waters were analyzed for their associated Mn, Al and C content. Although the concentrations of A1 and Mn indicated that the trapped particulates were primarily alumino-silicates, an additional fraction of originally weakly sorbed Mn (5-30%) was found dissolved in the sediment trap salt solutions. The latter Mn was significantly correlated with the trapped particulate organic C and suggests that passively sinking organic detritus is responsible for the removal of dissolved Mn from the water column. The fluxes resulting from this process are on the order of 35 μg Mn/cm2 kyr in the mid-water column and thus represent an improtant factor in marine Mn balance schemes.
Amounts of dissolved Mn in the surface waters of the study area always exceeded those in the mid-water column in spite of surface Mn removal at a rate of 1200 μg/cm2 kyr. The only Mn source large enough to balance this removal would appear to be continental weathering, either dissolved riverine Mn or Mn released via the weathering of particulate riverine Mn after its introductive into the marine environment. Residence times based on actual flux and water column measurements were 1.8 years for surface waters and 31 years for the upper 1500 m of the water column.

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