Importance of mineral cations and organics in gas-aerosol partitioning of reactive nitrogen compounds: case study based on MINOS results
作者： S. Metzger , N. Mihalopoulos , J. Lelieveld
关键词: Potassium 、 Chloride 、 Chemistry 、 Nitric acid 、 Nitrate 、 Reactive nitrogen 、 Inorganic chemistry 、 Magnesium 、 Environmental chemistry 、 Sulfate 、 Ammonia
摘要: The partitioning of reactive nitrogen compounds between the gas and aerosol phase, as observed during MINOS (Mediterranean INtensive Oxidant Study) campaign in Crete, Greece, July August 2001, has been studied with three thermodynamic gas-aerosol equilibrium models (EQMs) different chemical complexity: ISORROPIA, which is limited to ammonium-sulfate-nitrate-sodium-chloride-water-system; SCAPE2, also includes mineral elements (calcium, magnesium potassium); EQSAM2, additionally accounts for organic acids. EQMs are constrained by measured (g) (a) concentrations: Total ammonia (NH 3(g) NH 4(a) + ), total nitrate (HNO NO 3(a) - sulfate (H 2 SO 4(g) 2- chloride (HCl Cl sodium (Na calcium (Ca 2+ (Mg potassium (K ) acids (a). Although differ considerably particular aspects, their application at same level complexity yields comparable results composition phase nitric acid, i.e. within range measurement uncertainties (~10%). Their levels complexity, however, gives rise substantial differences compounds. Our show that only if (soluble) components (lumped) accounted for, acid can be accurately reproduced air pollution episodes characterized a complex mixture, typical Mediterranean lower atmosphere.
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