Concentrations, physico-chemical states and mean residence times of 210 Pb and 210 Po in marine and estuarine waters

Details Concentrations, physico-chemical states and mean residence times of 210 Pb and 210 Po in marine and estuarine waters Concentrations, physico-chemical states and mean residence times of 210 Pb and 210 Po in marine and estuarine waters

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1019s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 8, pp.1019-1031

Physics

8

Scientific paper

The concentrations and physico-chemical states of 210 Pb have been measured in Bikini Atoll and Washington State coastal waters, and 210 Po in Washington coastal waters. Lead-210 concentrations of 113-133 dpm · m -3 were found in surface water collections near Bikini Atoll and 29-153 dpm · m -3 in Bikini Lagoon. The concentrations of 210 Pb in near Bikini and in Washington State waters increased with depth in the upper 150m at a rate of 0.35-0.45dpm·m -3 · m -1 . In the North Equatorial Current waters near Bikini Atoll 210 Pb was found associated predominantly with the soluble (colloidal) fraction, but in Washington coastal waters 210 Pb and 210 Po were found associated with the paniculate (> 0.3 m) fraction. The mean residence times of 210 Pb, calculated from the atmospheric input to marine waters from precipitation and the concentrations measured in surface water, were consistent with the physico-chemical states of 210 Pb found in samples collected in deep ocean and coastal waters. Approximate values of the mean residence times were calculated, for the upper 50 m, to be as follows: 58 days in the Strait of Juan de Fuca, 128 days at the 5-mile (8 km) station off Cape Flattery (Washington), 163 days at the 12-mile (19 km) station off Cape Flattery, and 2.6 yr near Bikini Atoll. It appears that 210 Pb and 210 Po can be used to trace particle removal rates in the upper layers of marine waters.

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