Image: Mercury fremont ice core
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Description: 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.
Title: Mercury fremont ice core
Credit: http://toxics.usgs.gov/pubs/FS-051-02/ English Wikipedia, original upload 12 May 2005 by SEWilco
Author: US government
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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