2018 Volume 53 Issue 4 Pages 130-135
A sudden increase up to 16 ppbv of the hourly NH3 concentration was observed after drying rain and dew on 11th December 2015. Factors related to the sudden NH3 increase were investigated by using meteorological data and the chemical constituents of the rainwater. For the chemical composition of the rainwater on December 11, the pH was about 5.6 with high sea salt and Ca2+concentrations, allowing the volatilization of NH4+ in the rainwater after drying. Another important factor was considered to be the dew formation under the high NH3 concentration. Combined with these factors, the NH3 concentration in the atmosphere sharply increased with the decreasing humidity after drying hydrometeor.
