Anthropogenic Forcings on the Surficial Osmium Cycle

Sebastien Rauch, Bernhard Peucker-Ehrenbrink, Malin E. Kylander, Dominik J. Weiss, Antonio Martinez-Cortizas, David Heslop, Carolina Olid, Timothy Michael Mighall, Harold F. Hemond

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Osmium is among the least abundant elements in the Earth's continental crust. Recent anthropogenic Os contamination of the environment from mining and smelting activities, automotive catalytic converter use, and hospital discharges has been documented. Here we present evidence for anthropogenic overprinting of the natural Os cycle using a ca. 7000-year record of atmospheric Os deposition and isotopic composition from an ombrotrophic peat bog in NW Spain. Preanthropogenic Os accumulation in this area is 0.10 +/- 0.04 ng m(-2) y(-1). The oldest strata showing human influence correspond to early metal mining and processing on the Iberian Peninsula (ca. 4700-2500 cal. BP). Elevated Os accumulation rates are found thereafter with a local maximum of 1.1 ng m(-2) y(-1) during the Roman occupation of the Iberian Peninsula (ca. 1930 cal. BP)and a further increase starting in 1750 AD with Os accumulation reaching 30 ng m(-2) y(-1) in the most recent samples. Osmium isotopic composition (Os-187/Os-188) indicates that recent elevated Os accumulation results from increased input of unradiogenic Os from industrial and automotive sources as well as from enhanced deposition of radiogenic Os through increased fossil fuel combustion and soil erosion. We posit that the rapid increase in catalyst-equipped vehicles, increased fossil fuel combustion, and changes in land-use make the changes observed in NW Spain globally relevant.

Original languageEnglish
Pages (from-to)881-887
Number of pages7
JournalEnvironmental Science & Technology
Volume44
Issue number3
Early online date9 Dec 2009
DOIs
Publication statusPublished - 1 Feb 2010

Keywords

  • ombrotrophic peat bog
  • group element concentrationa
  • isotopic composition
  • RE-187-OS-187 systematics
  • airborne particles
  • Jura Mountains
  • atmospheric PB
  • Rio tinto
  • NW Spain
  • ICP-MS

Cite this

Rauch, S., Peucker-Ehrenbrink, B., Kylander, M. E., Weiss, D. J., Martinez-Cortizas, A., Heslop, D., ... Hemond, H. F. (2010). Anthropogenic Forcings on the Surficial Osmium Cycle. Environmental Science & Technology, 44(3), 881-887. https://doi.org/10.1021/es901887f

Anthropogenic Forcings on the Surficial Osmium Cycle. / Rauch, Sebastien; Peucker-Ehrenbrink, Bernhard; Kylander, Malin E.; Weiss, Dominik J.; Martinez-Cortizas, Antonio; Heslop, David; Olid, Carolina; Mighall, Timothy Michael; Hemond, Harold F.

In: Environmental Science & Technology, Vol. 44, No. 3, 01.02.2010, p. 881-887.

Research output: Contribution to journalArticle

Rauch, S, Peucker-Ehrenbrink, B, Kylander, ME, Weiss, DJ, Martinez-Cortizas, A, Heslop, D, Olid, C, Mighall, TM & Hemond, HF 2010, 'Anthropogenic Forcings on the Surficial Osmium Cycle' Environmental Science & Technology, vol. 44, no. 3, pp. 881-887. https://doi.org/10.1021/es901887f
Rauch S, Peucker-Ehrenbrink B, Kylander ME, Weiss DJ, Martinez-Cortizas A, Heslop D et al. Anthropogenic Forcings on the Surficial Osmium Cycle. Environmental Science & Technology. 2010 Feb 1;44(3):881-887. https://doi.org/10.1021/es901887f
Rauch, Sebastien ; Peucker-Ehrenbrink, Bernhard ; Kylander, Malin E. ; Weiss, Dominik J. ; Martinez-Cortizas, Antonio ; Heslop, David ; Olid, Carolina ; Mighall, Timothy Michael ; Hemond, Harold F. / Anthropogenic Forcings on the Surficial Osmium Cycle. In: Environmental Science & Technology. 2010 ; Vol. 44, No. 3. pp. 881-887.
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AB - Osmium is among the least abundant elements in the Earth's continental crust. Recent anthropogenic Os contamination of the environment from mining and smelting activities, automotive catalytic converter use, and hospital discharges has been documented. Here we present evidence for anthropogenic overprinting of the natural Os cycle using a ca. 7000-year record of atmospheric Os deposition and isotopic composition from an ombrotrophic peat bog in NW Spain. Preanthropogenic Os accumulation in this area is 0.10 +/- 0.04 ng m(-2) y(-1). The oldest strata showing human influence correspond to early metal mining and processing on the Iberian Peninsula (ca. 4700-2500 cal. BP). Elevated Os accumulation rates are found thereafter with a local maximum of 1.1 ng m(-2) y(-1) during the Roman occupation of the Iberian Peninsula (ca. 1930 cal. BP)and a further increase starting in 1750 AD with Os accumulation reaching 30 ng m(-2) y(-1) in the most recent samples. Osmium isotopic composition (Os-187/Os-188) indicates that recent elevated Os accumulation results from increased input of unradiogenic Os from industrial and automotive sources as well as from enhanced deposition of radiogenic Os through increased fossil fuel combustion and soil erosion. We posit that the rapid increase in catalyst-equipped vehicles, increased fossil fuel combustion, and changes in land-use make the changes observed in NW Spain globally relevant.

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