| Abstract: | Atmospheric inputs and runoff concentrations of total Kjeldahl nitrogen, dissolved nitrite-plus-nitrate nitrogen, total phosphorus, total sulfate (only for atmospheric input), total chloride, and total lead were studied from April 1 to October 31 , 1980, in one rural and three urban watersheds in the Twin Cities metropolitan area, Minnesota. Seasonal patterns of wetfall and dryfall generally were similar for all constituents except chloride in both rural and urban watersheds. Similarity between constituents and between rural and urban watersheds suggested that regional air masses transported from the Gulf of Mexico by frontal storm movements influence seasonal patterns of atmospheric input in the metropolitan area. Local influences such as industrial, agricultural, and vehicular air pollutants were found to influence the magnitude or rate of atmospheric input rather than the seasonal pattern. Chloride was primarily influenced by northwest frontal storms laden with coastal chloride. Local influences such as dust from road de-icing salt are thought to have caused an increase in atmospheric chloride during June. The atmospheric contribution to nonpoint-source-runoff pollution of nitrogen, in the form of nitrite-plus-nitrate, and lead was extremely high, constituting as much as 84 percent of the runoff load. In contrast, phosphorus and chloride inputs were low, averaging 6 percent of the total runoff load. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 26375 |
| Citation Author: | Brown, R. G. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iv, 24 p. :ill. ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 83-4195 |
| Citation Search Results Text: | Atmospheric deposition of selected chemicals and their effect on nonpoint-source pollution in the Twin Cities Metropolitan Area, Minnesota; 1984; WRI; 83-4195; Brown, R. G. |
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| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Atmospheric deposition of selected chemicals and their effect on nonpoint-source pollution in the Twin Cities Metropolitan Area, Minnesota; 1984; WRI; 83-4195; Brown, R. G. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1983/4195/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1983/4195/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
