From the knowledge of NH4+ and H+ concentrations in precipitation (during rainy periods) and aerosol particles (when it is not raining) over the continental United States and in ocean water along the coasts, the atmospheric NH3 gas concentration can be inferred by assuming Henry's law equilibrium. It is found that this method gives NH3 concentrations which are in some cases considerably lower than those obtained through direct measurements. NH3 is thus estimated to vary geographically and temporally with the mid-west region being a dominant source of this trace gas. Oceanic areas exhibit much lower concentrations. These findings are consistent with the existence of acid sulfates as a dominant atmospheric aerosol, with soil chemistry and with previous investigations concerning with the association of the molecular forms of sulfate aerosols with air mass history.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Earth and Planetary Sciences(all)