Physics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1059h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 5, pp.1059-1070
Physics
16
Scientific paper
Total dissolvable Cu and Mn have been measured in seawaters collected from the continental shelf of the eastern Bering Sea. Copper concentrations of < 3 nmole kg -1 were measured over the shelf break but concentrations increased to >4 nmole kg -1 inshore of a hydrographie front over the 100 m isobath. Manganese concentrations also were low over the shelf break, <10 nmole kg -1 , and increased systematically to concentrations >10 nmole kg -1 inshore of the hydrographic front. Depth distributions of Mn at all continental shelf stations showed gradients into the sediments, with concentrations typically >20 nmole kg -1 in a bottom layer extending about 30 m off the bottom. Benthic Cu and Mn fluxes are indicated by cross-shelf pore water profiles that show interfacial concentrations more than an order of magnitude greater than in bottom water. These data and the results of a model of metal transport across the shelf suggest that Cu and Mn fluxes, estimated at 2 and 18 nmole cm -2 y -1 , respectively, from continental shelf sediments may be one "source" of these metals to the deep sea.
Cullen Douglas
Heggie David
Klinkhammer Gary
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