File:Mercury fremont ice core.png
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![File:Mercury fremont ice core.png](https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Mercury_fremont_ice_core.png/370px-Mercury_fremont_ice_core.png?20090209203508)
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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 | |
Source | http://toxics.usgs.gov/pubs/FS-051-02/ English Wikipedia, original upload 12 May 2005 by SEWilco |
Author | US government |
Other versions | العربيَّة |
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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/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:35, 9 February 2009 | ![]() | 639 × 1,035 (26 KB) | RedAndr (talk | contribs) | Better resolution |
15:30, 1 October 2005 | ![]() | 320 × 513 (20 KB) | Saperaud~commonswiki (talk | contribs) | Atmospheric 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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