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- W304880605 abstract "This report describes the behavior of the chemical constituents in precipitation, including their typical concentrations and ranges, regional patterns, and seasonal changes. In addition, the influence of some meteorological factors on precipitation chemistry is assessed statistically. Daily precipitation monitoring data for the period 1978 through 1983 over the eastern United States were examined using measurements for 34 sites from the UAPSP, MAP3S, and WADMP networks. Data from these three networks were combined into a single, uniform archive of daily rainfall records containing precipitation amounts, pH, and constituent concentrations. Statistical relationships of each constituent to hydrogen ion concentration, and correlation coefficients between all of the constituents show that three of them - sulfate, nitrate, and ammonium - are most closely related to acidity. At six sites that span the area, empirical linear equations using sulfate, nitrate, ammonium, calcium, magnesium, sodium, chlorine, and potassium ion concentrations explain approximately 95% of the variability in acidity. To evaluate spatial and temporal patterns, statistical interpolation methods (called Kriging) were applied to yearly concentration and deposition values. Highest concentrations of hydrogen ions, sulfate, and nitrate occurred along the Ohio River valley northeastward to New England. Maximum ammonium concentrations occurred in a belt extending from the northernmore » Great Plains eastward across the Great Lakes. Over the period investigated, a small trend toward decreasing acidity and decreasing concentrations of the three main constituents was found. Year-to-year changes were both upward and downward, with values decreasing from 1981 to 1983. More data are required to determine whether the apparent trend is continuing. In contrast, no statistically significant trends were found in the amount of material deposited by precipitation.« less" @default.
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- W304880605 date "1986-07-01" @default.
- W304880605 modified "2023-09-27" @default.
- W304880605 title "Statistical analysis of precipitation chemistry measurements over the eastern United States. Final report" @default.
- W304880605 hasPublicationYear "1986" @default.
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