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• W2034361195 abstract "As Patterson and coworkers have shown, most of the lead in the modern ocean and atmosphere is of anthropogenic origin. Reductions in the utilization of leaded gasoline over the past two decades should decrease lead deposition from the atmosphere in remote locations. The search for trends in Pb deposition within a single decade is bedeviled by large-amplitude short-term variability due to the inherent noisiness of the atmosphere/ocean system. We find that, over the course of a year, lead concentrations in the surface waters of the western North Atlantic Ocean are variable (factor of 2), and in the snow deposited in central Greenland, highly variable (order of magnitude). In the western North Atlantic, 210Pb normalization minimizes this problem because 210Pb and Pb sources are spatially correlated and continental 210Pb emissions are constant. It is clear the Pb in surface waters of the western North Atlantic has decreased by a factor of 4 during the 1980s. 210Pb normalization does not help in the Arctic because stable Pb and 210Pb are not spatially correlated. Because of the order-of-magnitude variability in Greenland snow Pb linked to annual cycles, any discontinuous time series is likely to be affected by the phenomenon of aliasing. Aliasing makes it difficult to determine if there is a trend in Pb deposition in central Greenland during the 1980s; present evidence suggests that the reduction in Pb concentration in snow during the 1980s is less than a factor of two; certainly quite a bit less than observed in the western North Atlantic and less than the factor of >7 reduction in leaded gasoline utilization in the United States during the decade. Although we expect that decadal-scale trends in the 1970s and 1980s are in fact occurring due to the phasing out of leaded gasoline, the reported magnitude of decadal-scale trends should be regarded with some reservation until confirmed by independent samplings." @default.
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• W2034361195 date "1994-08-01" @default.
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• W2034361195 title "Lead variability in the western North Atlantic Ocean and central Greenland ice: Implications for the search for decadal trends in anthropogenic emissions" @default.
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• W2034361195 doi "https://doi.org/10.1016/0016-7037(94)90050-7" @default.
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