210Pb scavenging in the North Atlantic and North Pacific Oceans

Details 210Pb scavenging in the North Atlantic and North Pacific Oceans 210Pb scavenging in the North Atlantic and North Pacific Oceans

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..97..332c&link_type=abstract

Earth and Planetary Science Letters, Volume 97, Issue 3-4, p. 332-352.

Computer Science

21

Scientific paper

The radionuclide 210Pb shows significant geographic variations in the extent of its removal from the open ocean water column. This ``texture of scavenging'' is defined by mapping: (1) the integrated deficiency of 210Pb in the water column, relative to its supply from the atmosphere and from in situ decay of dissolved 226Ra, and (2) inventories of excess 210Pb in deep-sea sediments. The ratio of 210Pb deficiency to its supply, termed the scavenging effectiveness, is ~ 20% in the North Equatorial Pacific and ~ 50% in the North Atlantic. This variation is related to the combined effects of uptake of 210Pb onto sinking particles and lateral transport of 210Pb to areas of more intense removal. Sediment inventories of excess 210Pb, normalized to the 210Pb deficiency in the overlying water column, permit evaluation of the relative importance of these effects. In the North Equatorial Pacific virtually all of the 210Pb removed from the water column is present in the underlying sediments but in the mid-latitude North Atlantic, the sediments comprise only about 50% of the 210Pb removed. The deficiencies of 210Pb in the mid-latitude North Atlantic sediments south of 50°N are qualitatively offset by surpluses in high-latitude sediments north of 50°N. Higher primary productivity and new production in the surface waters of the high-latitude North Atlantic and North Equatorial Pacific, relative to the oligotrophic central North Atlantic, may account for the greater fluxes of 210Pb to bottom sediments in those areas.

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