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Lead isotopic disequilibria between plankton assemblages and surface waters reflect life cycle strategies of coastal populations within a northeast Pacific upwelling regime
Author(s) -
Flegal A. Russell,
Garrison David L.,
Niemeyer Sidney
Publication year - 1993
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1993.38.3.0670
Subject(s) - upwelling , plankton , oceanography , seawater , δ13c , isotope analysis , geology , environmental science , lead (geology) , stable isotope ratio , paleontology , physics , quantum mechanics
Stable lead isotopic compositions ( 204 Pb, 206 Pb, 207 Pb, 208 Pb) were determined for net plankton samples from a northeast Pacific upwelling regime, following a study that revealed pronounced isotopic composition differences in seawater within that regime. Lead isotopic ratios of the plankton were positively correlated with those of the seawater. Both evidenced the predominance of two sources of industrial Pb (North American and Asian aerosols) in northeast Pacific surface waters, which substantiated the postulate that essentially all (>90%) of the Pb in the northeast Pacific biome derives from anthropogenic emissions. However, the isotopic compositions of plankton and seawater collected concurrently from the same locations were often markedly dissimilar. The isotopic disequilibria are attributed