. The Case against the rain : a report on acid precipitation and Ontario programs for remedial --. Acid rain. Atmospheric Studies Environment Ontario atmospheric studies have shown that a large proportion of the precipitation in Ontario is generally associatecJ with moist air masses that originate in the Gulf of Mexico With transport over industrial- ized eastern United States, the air becomes laden with acid bearing compounds Precipitation due to warm fronts and that from convective cloud associated with this air mass is acidic on arrival to the province (see figure below) Back traje


. The Case against the rain : a report on acid precipitation and Ontario programs for remedial --. Acid rain. Atmospheric Studies Environment Ontario atmospheric studies have shown that a large proportion of the precipitation in Ontario is generally associatecJ with moist air masses that originate in the Gulf of Mexico With transport over industrial- ized eastern United States, the air becomes laden with acid bearing compounds Precipitation due to warm fronts and that from convective cloud associated with this air mass is acidic on arrival to the province (see figure below) Back trajectory analyses is a name given to a proce- dure by which air parcels are followed backward in time to determine the origin and track that the air parcels have taken Data from precipitation collectors operated at Dorset in one of Ontario's sensitive areas (Muskoka-Haliburton) over almost a three year period (August 1976-April 1979), showed that about 75% of the precipitation events and moreover, approximately 80% of the wet acidic deposition at this site, were associated with air masses arriving from the south and southwest Comparitively a small percentage of the loadings came from the north and northwest where major Ontario sources are located It was also found that the acidity of precipitation related to southerly air masses was more than twice as great as that of precipi- tation from the north. .SOUTH CAROLINA Figure of typical storm track across central United States into Ontario Dotted areas represent precipitation associated with this typical storm Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ontario. Ministry of the Environment. [Toronto] : Ontario Ministry of the Environment, 1982


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