Atmospheric deposition long-term monitoring

There are few long-term monitoring stations tracking atmospheric deposition levels, and funding for these stations is constantly at risk. There is a... 

Norton, S. A. J. S. Kahl, 1987. A comparison of lake sediments and ombrotrophic peat deposits as long term monitors of atmospheric pollution. New Approaches to Monitoring Aquatic Ecosystems, ASTM SIP 940, T. P. Boyle, American Society for Testing and Materials, Philadelphia, 40-57. 

Wildlife indicators of mercury exposure and trends are important elements of a comprehensive approach to assess mercury in the environment and the monitoring of trends that may assist regulators and the regulated community in long-term evalnation of the need and usefulness of mercury somce controls. It is important to understand, however, that bioindicator data alone are insufficient to answer snch critical qnestions as identification of mercniy sonrces, or the relative importance of local, regional, and global inputs of mercury somces to atmospheric deposition and errvirorrmerrtal loading in specific areas. 

In theory, significant reduction in SO2 emissions should, over a long term period and large areas, produce detectable reductions in the amount of wet sulfate deposition. The acid rain monitoring data in North America have been gathered by Environment Canada and stored in the National Atmospheric Chemistry (NatChem) Database, details of which can be found at www.airquality.tor.ec.gc.ca/natchem. Analysis of the deposition chemistry data has confirmed that wet sulfate deposition did indeed... 

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