Abstract
The Kentucky Acid Deposition Program (KADP) precipitation chemistry network was initiated in 1 9 83 with the goal of providing a statewide monitoring system to document the occurrence of acid deposition in Kentucky. A variety of analyses have been performed on the KADP data for the period 1 983-1 989 to characterize precipitation chemistry in the lower Ohio River Valley. H2S04 and HN03 are identified as the primary contributors to precipitation acidity in this region, with HCI playing a secondary role. Neutralization of precipitation acidity occurs both as a result of the dissolution of alkaline soil dust compounds containing Ca + + , Mg + + , and K + as well as the absorption of NH3 vapor. H + , S04 � , and N03precipitation concentrations exhibit a seasonal pattern i n which higher concentrations are observed during summer months and lower concentrations during winter months. The seasonal behavior of NH4 + concentrations, however, differs from this pattern in that the highest concentrations occur during spring months while the lowest values occur during autumn. Annual depositions of S04�, N03-, Cl-, NH4 + , Ca + + , and H + show no apparent qualitative temporal trend over the 1 9 85-1 989 period in this region.
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