Abstract
Four years of precipitation chemistry data for eastern North America were used to investigate seasonal and geographical variations in SO =4 /NO -3 ratio. Several distinct regimes occur. One, in the region of heaviest acidic deposition extending from the states south of the Great Lakes across New England and southeastern Canada, has a very strong seasonal variation in the SO =4 /NO -3 molar ratio in deposition. The ratio ranges from about 1.5 in summer to about 0.5 in winter. Another, in the smaller area of Texas and surrounding states, shows the reverse seasonal pattern. Yet another, in the high plains states, has a double maximum in the ratio in Spring and Fall. The remainder of the region has an irregular seasonal pattern. Insight into the cause of SO =4 /NO -3 variations was obtained using a simple chemical transport box model. It showed that the chemical transformation of SO2 and NOX in the atmosphere is a major factor. A comparison of model predictions and observations indicate that in the vicinity of mid-western American sources the molar ratio of amount of SO2 oxidized in-cloud to that of NO2 is 0.5 in winter and 1.5 in summer.
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Barrie, L.A., Anlauf, K.G., Wiebe, H.A., and Fellin, P., 1984: Acidic pollutants in air and precipitation at selected rural locations in Canada, Chapter 2 in Deposition Both Wet and Dry, ed. B.B. Hicks, Acid. Precip. Series, Vol. 4, Series Ed. J. I. Teasley, Butterworth Publishers, 15–35.
Barrie, L.A. and Hales, J.M., 1984: Tellus, 36B, 333.
Barrie, L.A. and Vet, R.J., 1984: Atmos. Environ., 18, 1459.
Barrie, L.A., 1985: J.G.R., 90, 5789
Bowersox, V. C., and de Pena, R. G., 1980: J. G. R, 85, 5614.
Galvin, P. J. and Cline,J. A., 1978: Atmos. Environ, 12, 1163.
McLean, R. A. N., 1981: J. Air Poll. Control Assoc., 31, 1184.
National Academy of Sciences: 1983, Acid Deposition - Atmospheric Processes in Eastern North America, Nat. Academy Press, Washington, D.C., 375 pp.
Portelli, R.V., 1977: Mixing heights, wind speeds and ventilation coefficients for Canada. Climatological Studies No. 31, Atmospheric Environment Service, Downsview, Ont. Canada, 87 pp.
Toothman, D.A. and Yates, J.C.: 1984:, Status report on the development of the NAPAP emission inventory for the 1980 base year and summary of preliminary data, EPA Report EPA–600/7–84–091.
Voldner, E.C. and Sirois, A., 1986: J. Water Air Soil Poll, submitted.
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© 1986 Springer Science+Business Media Dordrecht
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Summers, P.W., Barrie, L.A. (1986). The Spatial and Temporal Variation of the Sulphate to Nitrate Ratio in Precipitation in Eastern North America. In: Martin, H.C. (eds) Acidic Precipitation. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3385-9_28
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DOI: https://doi.org/10.1007/978-94-009-3385-9_28
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