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English: This chart shows the level of atmospheric mercury deposition detected in ice cores from the Upper Fremont Glacier in Wyoming. Heightened deposition rates correspond to volcanic and anthropogenic events over the past 270 years. Preindustrial deposition rates can be conservatively extrapolated to present time (4 ng/L; in green) to illustrate the increase during the past 100 years (in red) and significant decreases in the past 15-20 years.
Français : Ce graphique représente les dépôts atmosphériques de mercure décelés aux Etats-Unis dans les carottes de glace prélevées dans le haut du glacier de Fremont (Wyoming, USA). Les pics de déposition au cours des 270 dernières années correspondent à des événements volcaniques et anthropiques. Le taux pré-industriel de dépôt peut être extrapolé à conservatrice heure actuelle (4 ng/L, en vert). On note dans cette région une forte augmentation au cours des 100 dernières années (en rouge) et une relative mais significative diminution dans les 15-20 dernières années.
Date
Source http://toxics.usgs.gov/pubs/FS-051-02/ English Wikipedia, original upload 12 May 2005 by SEWilco
Author US government
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Date/TimeThumbnailDimensionsUserComment
current20:35, 9 February 2009Thumbnail for version as of 20:35, 9 February 2009639 × 1,035 (26 KB)RedAndrBetter resolution
15:30, 1 October 2005Thumbnail for version as of 15:30, 1 October 2005320 × 513 (20 KB)Saperaud~commonswikiAtmospheric mercury deposition corresponds to volcanic and anthropogenic events over the past 270 years. Preindustrial deposition rates can be conservatively extrapolated to present time (4 ng/L; in green) to illustrate t

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