Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..80...36n&link_type=abstract
Earth and Planetary Science Letters, Volume 80, Issue 1-2, p. 36-40.
Physics
4
Scientific paper
Four vertical 210Pb profiles obtained within 250 m above bottom in the deep western North Pacific showed no significant variation with depth, irrespective of marked increase of excess 222Rn relative to 226Ra near the seafloor. Consequently, the apparent box-model residence time based on 210Pb/222Rn activity ratio sharply decreases from ~ 100 years in ocean interior to < 10 years near the bottom. However, the 210Pb data can also be explained using a vertical mixing and first-order scavenging model without any enhanced scavenging near the sediment-water interface. This model calculation indicates that bottom excess 222Rn can hardly influence 210Pb in the water and the short residence time derived using box-model is an artifact and does not reflect chemical reactivity of Pb. This also implies that the deficiency of 210Pb as a result of removal by scavenging is best estimated based on 226Ra and not on 222Rn.
The 210Pb scavenging at the sediment-water interface that has been inferred from the oceanic distributions of 210Pb appears difficult to be detected from bottom 210Pb profile measurements.
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