File:Mercury fremont ice core.png

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DescriptionMercury fremont ice core.png	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	2005
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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