摘要：Our measurements of ion size distributions near a waterfall provided new evidence for a waterfall-induced modification of air ion sizes. The ion size spectrum near a waterfall permanently differs from that in ordinary tropospheric air. In this paper we investigated the near-waterfall air ions chemical nature in detail. We carried out a simulation series of air small negative ion evolution, proposing that falling water, as a new environmental component, increases the concentration of OH– cluster ions. The produced OH– ions were employed as an extra input for our ion evolution model. The presence of additional OH– ions resulted in a decrease of typically model-provided NO3– and/or HSO4– cluster ion concentrations and an increase of the abundance of HCO3– cluster ions. Near the waterfall the latter ions became dominant in our simulations.
