Reconstructing historical atmospheric mercury deposition in Western Europe using : Misten peat bog cores, Belgium

Mohammed Allan (1) , Gaël Le Roux (2) , Jeroen E. Sonke (3) , Natalia Piotrowska (4) , Maurice Streel (5) , Nathalie Fagel (1)

1 AGEs - Argiles, Géochimie et Environnements sédimentaires - AGES (Liège, Belgium)
2 LEFE - Laboratoire Ecologie Fonctionnelle et Environnement
3 GET - Géosciences Environnement Toulouse
4 Silesian University of Technology
5 Université de Liège

Four sediment cores were collected in 2008 from the Misten ombrotrophic peat bog in the Northern part of the Hautes Fagnes Plateau in Belgium. Total mercury (Hg) concentrations were analyzed to investigate the intra-site variability in atmospheric Hg deposition over the past 1500 years. Mercury concentrations in the four cores ranged from 16 to 1100 μg kg− 1, with the maxima between 840 and 1100 μg kg− 1. A chronological framework was established using radiometric 210Pb and 14C dating of two cores (M1 and M4). Pollen horizons from these two cores were correlated with data from two additional cores, providing a consistent dating framework between all the sites. There was good agreement between atmospheric Hg accumulation rates in the four cores over time based on precise age dating and pollen chronosequences. The average Hg accumulation rate before the influence of human activities (from 500 to 1300 AD) was 1.8 ± 1 μg m− 2 y− 1 (2SD). Maximum Hg accumulation rates ranged from 90 to 200 μg m− 2 y− 1 between 1930 and 1980 AD. During the European-North American Industrial Revolution, the mean Hg accumulation rate exceeded the pre-Industrial values by a factor of 63. Based on comparisons with historical records of anthropogenic activities in Europe and Belgium, the predominant regional anthropogenic sources of Hg during and after the Industrial Revolution were coal burning and smelter Hg emissions. Mercury accumulation rates and chronologies in the Misten cores were consistent with those reported for other European peat records.

Mots clés: Atmospheric pollution; Coal combustion; Multi-coring; Peat geochemistry; Hg accumulation rate; Mercury

Domaines: Chimie organique; Océan, Atmosphère

Mohammed Allan, Gaël Le Roux, Jeroen E. Sonke, Natalia Piotrowska, Maurice Streel, et al.. Reconstructing historical atmospheric mercury deposition in Western Europe using : Misten peat bog cores, Belgium. Science of the Total Environment, 2013, vol. 442, pp. 290-301. ⟨10.1016/j.scitotenv.2012.10.044⟩. ⟨hal-00927584⟩