210 Pb balance in Long Island Sound

Computer Science – Sound

Scientific paper

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Scientific paper

A material balance is constructed for excess 210 Pb (relative to 226 Ra) as a test of the retentivity of Long Island Sound for a reactive heavy metal. Excess 210 Pb is supplied to Long Island Sound chiefly by direct atmospheric deposition [1 ± 0.2(dis·min -1 ) cm -2 · yr -1 ]. Rivers supply less than 20% of the atmospheric flux, and other inputs, from open ocean waters, 226 Ra decay, groundwater seepage, and sewage discharge, appear to be negligible. The total input of excess 210 Pb represents approximately the flux required to maintain the inventory of excess 210 Pb measured in sediment cores from central Long Island Sound; that is, excess 210 Pb is lost from Long Island Sound chiefly by radioactive decay. The retention of excess 210 Pb within Long Island Sound is achieved in two steps: a rapid removal of soluble 210 Pb onto suspended particles and the ongoing entrapment of particles in the basin by the residual bottom-water influx from the east.

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