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Industrial-era lead and mercury contamination in southern Greenland implicates North American sources.

https://arctichealth.org/en/permalink/ahliterature286048
Source
Sci Total Environ. 2017 Sep 21;613-614:919-930
Publication Type
Article
Date
Sep-21-2017
Author
Marta Pérez-Rodríguez
Noemí Silva-Sánchez
Malin E Kylander
Richard Bindler
Tim M Mighall
J Edward Schofield
Kevin J Edwards
Antonio Martínez Cortizas
Source
Sci Total Environ. 2017 Sep 21;613-614:919-930
Date
Sep-21-2017
Language
English
Publication Type
Article
Abstract
To study the long-range transport of atmospheric pollutants from lower latitude industrial areas to the Arctic, we analysed a peat core spanning the last ~700cal.yr (~1300-2000CE) from southern Greenland, an area sensitive to atmospheric pollution from North American and Eurasian sources. A previous investigation conducted in the same location recorded atmospheric lead (Pb) pollution after ~1845, with peak values recorded in the 1970s, and concluded that a North American source was most likely. To confirm the origin of the lead, we present new Pb isotope data from Sandhavn, together with a high-resolution record for mercury (Hg) deposition. Results demonstrate that the mercury accumulation rate has steadily increased since the beginning of the 19th century, with maximum values of 9.3µgm(-2)yr(-1) recorded ~1940. Lead isotopic ratios show two mixing lines: one which represents inputs from local and regional geogenic sources, and another that comprises regional geogenic and pollution sources. Detrending the Pb isotopic ratio record (thereby extracting the effect of the geogenic mixing) has enabled us to reconstruct a detailed chronology of metal pollution. The first sustained decrease in Pb isotope signals is recorded as beginning ~1740-1780 with the lowest values (indicating the highest pollution signature) dated to ~1960-1970. The (206)Pb/(207)Pb ratio of excess Pb (measuring 1.222, and reflecting pollution-generated Pb), when compared with the Pb isotopic composition of the Sandhavn peat record since the 19th century and the timing of Pb enrichments, clearly points to the dominance of pollution sources from North America, although it did not prove possible to further differentiate the emissions sources geographically.
PubMed ID
28946380 View in PubMed
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