Alert: Please correct the errors!
The Canadian National Atmospheric Chemistry (NAtChem) Database is a data archival and analysis facility operated by the Meteorological Service of Canada since 1987. The purpose of the database is to enhance atmospheric research through the archival and analysis of North American air and precipitation chemistry data. Such research includes investigations into the chemical nature of the atmosphere, atmospheric processes, spatial and temporal patterns, source-receptor relationships and long range transport of air pollutants. The use of ArcGIS has made it possible to observe the results of long-term wet deposition analyses, which show that there are significant changes in non-sea-salt sulphate (nssSO4=) wet deposition patterns between two 5-year periods (1990-1994 and 1996-2000) due to SO2 emission reductions in the five years before and after the implementation of the 1995 Phase 1 emission reductions mandated by the United States Clean Air Act Amendment. The implementation of ArcGIS for determining these results in Eastern North America will be described during the presentation.