Title: Peat bogs in northern Alberta, Canada, reveal decades of declining atmospheric Pb contamination
Authors: SHOTYK W.APPLEBY PeterBICALHO BeatrizDAVIES LaurenFROESE DuaneGRANT-WEAVER IainKRACHLER MICHAELMAGNAN GabrielMULLAN-BOUDREAU GillianNOERNBERG TommyPELLETIER RickSHANNON BobVAN BELLEN SimonZACCONE Claudio
Citation: GEOPHYSICAL RESEARCH LETTERS vol. 43 no. 18 p. 9964-9974
Publisher: AMER GEOPHYSICAL UNION
Publication Year: 2016
JRC N°: JRC103036
ISSN: 0094-8276
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC103036
DOI: 10.1002/2016GL070952
Type: Articles in periodicals and books
Abstract: Peat cores were collected from six bogs in northern Alberta to reconstruct changes in the atmospheric deposition of Pb, a valuable tracer of human activities. In each profile, the maximum Pb enrichment is found well below the surface. Radiometric age dating using three independent approaches (14C measurements of plant macrofossils combined with the atmospheric bomb pulse curve, plus 210Pb confirmed using the fallout radionuclides 137Cs and 241Am) showed that Pb contamination has been in decline for decades. Today, the surface layers of these bogs are comparable in composition to the “cleanest” peat samples ever found in the Northern Hemisphere, from a Swiss bog ~ 6000 to 9000 years old. The lack of contemporary Pb contamination in the Alberta bogs is testimony to successful international efforts of the past decades to reduce anthropogenic emissions of this potentially toxic metal to the atmosphere.
JRC Directorate:Nuclear Safety and Security

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.