Combined-Network Approach for Compilation, Evaluation, and Analysis of Precipitation-Chemistry Data for the Upper Ohio River Valley and Lower Great Lakes Region, 1976-85

摘要

The purpose of the report is to characterize the areal, seasonal, and year-to-year changes in the chemical composition of precipitation with reference to nine major ions and two physical properties. The major inorganic-chemical constituents and related physical properties and characteristics of precipitation are pH, hydrogen ion, sulfate, nitrate, chloride, ammonium, sodium, potassium, calcium, magnesium, and amount of precipitation. A detailed analysis of the areal and temporal patterns of precipitation chemistry in the upper Ohio River Valley and lower Great Lakes region was undertaken by use of a combination of data. The data, which span the period 1976-85, were selected from several independent precipitation-chemistry data-collection networks. Precipitation chemistry is characterized for Ohio, Indiana, Kentucky, lower Michigan, New York, Pennsylvania, West Virginia, and southern Ontario, Canada.