H2SO4-HNO3-H2O ternary system in the stratosphere

摘要: RECENTLY, Friend et al.1 reported a comprehensive laboratory study of system air containing trace quantities H2O, SO2, NH3 and O3. By varying the proportions these gases conditions radiation ultraviolet light temperature, they obtained some detailed information for studying mechanism formation stratospheric sulphate particles. They proposed chemical model to interpret their observations other observed features aerosol. The possible role nitric acid, however, which is relatively abundant in stratosphere2, was not included investigation stratosphere aerosol formation. Also, solid phase 75% H2SO4 by weight water at −50° C, as discussed Toon Pollack3, taken into consideration ammonium or persulphate particles stratosphere. Pollack examined physical properties sulphuric acid thermodynamic conditions3. Using equilibrium diagram analysis techniques4, compared vapour pressure over solutions with partial pressures stratosphere, concluded that cannot be present an lower For predicted are water, agreement Rosen5. From freezing curve solutions6, pointed out (75% weight)–H2O (25%) should exist either supercooled liquid. If most phase, then models using solution chemistry would applicable.