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The partitioning of reactive nitrogen compounds betweenthe gas and the aerosol phase, as observed during the MINOS (MediterraneanINtensive Oxidant Study) campaign in Crete, Greece, in July and August 2001,has been studied with three thermodynamic gas-aerosol equilibrium models(EQMs) of different chemical complexity: ISORROPIA, which is limited to theammonium-sulfate-nitrate-sodium-chloride-water-system; SCAPE2, which alsoincludes mineral elements (calcium, magnesium and potassium); and EQSAM2,which additionally accounts for organic acids. The different EQMs areconstrained by measured gas (g) and aerosol (a) concentrations: Total ammonia(NH3(g) and NH4(a)+), total nitrate (HNO3(g) andNO3(a)-), total sulfate (H2SO4(g) andSO4(a)2-), total chloride (HCl(g) and Cl-(a)),sodium (Na+(a)), calcium (Ca2+(a)), magnesium(Mg2+(a)), potassium (K+(a)) and organic acids (a).Although the three EQMs differ considerably in particular aspects, theirapplication at the same level of complexity yields comparable results forthe equilibrium composition and phase partitioning of ammonia and nitricacid, i.e. within the range of measurement uncertainties (~10%).Their application at different levels of complexity, however, gives rise tosubstantial differences for the gas-aerosol partitioning of reactivenitrogen compounds. Our results show that only if (soluble) mineralcomponents and (lumped) organic acids are accounted for, the observedgas-aerosol partitioning of ammonia and nitric acid can be accuratelyreproduced for air pollution episodes characterized by a complex chemicalmixture, typical for the Mediterranean lower atmosphere

Importance of mineral cations and organics in gas-aerosol partitioning of reactive nitrogen compounds: case study based on MINOS results