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- W2014702485 abstract "The investigation of the occurrence of lead and other heavy metals in Antarctic and Greenland ancient ice and recent snow is of great interest in reconstructing the past natural tropospheric cycles of these metals and determining to what extent these cycles have now been altered by man. Because concentrations to be measured are exceedingly low, down to the sub pg/g level, reliable data can however be obtained only if full control of contamination is achieved from field sampling to laboratory analysis. The available data show that the past natural concentrations of Pb, Cd, Zn, Cu, and Hg in Antarctic ancient ice are highly dependent upon climatic conditions, the highest values occurring during the coldest periods of the ice ages, especially during the Last Glacial Maximum about 18,000 years ago. Human activity has led to an increase in lead concentrations during recent centuries both in Antarctica (tenfold increase) and in Greenland (two hundredfold increase). This last increase was followed by a 7.5-fold decrease during the past two decades, mainly as a consequence of the rapid fall in the use of lead alkyl additives in the USA as confirmed by recent isotopic data." @default.
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- W2014702485 date "1994-08-01" @default.
- W2014702485 modified "2023-09-26" @default.
- W2014702485 title "Past and recent changes in the large-scale tropospheric cycles of lead and other heavy metals as documented in Antarctic and Greenland snow and ice: A review" @default.
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- W2014702485 doi "https://doi.org/10.1016/0016-7037(94)90049-3" @default.
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