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High levels of trace gas (O3 and CO) and aerosol (BC, fine and coarseparticle volumes), as well as high scattering coefficient(σp) values, were recorded at the regional GAW-WMO station ofMt. Cimone (CMN, 2165 m a.s.l., Italy) during the period 26–30 August2007. Analysis of air-mass circulation, aerosol chemical characterizationand trace gas and aerosol enhancement ratios (ERs), showed that high O3and aerosol levels were likely linked to (i) the transport of anthropogenicpollution from northern Italy, and (ii) the advection of air masses rich inmineral dust and biomass burning (BB) products from North Africa. Inparticular, during the advection of air masses from North Africa, the CO andaerosol levels (CO: 175 ppbv, BC: 1015 ng/m3, fine particle volume:3.00 μm3 cm−3, σp: 84.5 Mm−1) were evenhigher than during the pollution event (CO: 138 ppbv, BC: 733 ng/m3,fine particles volume: 1.58 μm3 cm−3, σp: 44.9 Mm<sup−). Moreover, despite the presence of mineral dust able to affectsignificantly the O3 concentration, the analysis of ERs showed that theBB event represented an efficient source of fine aerosol particles (e.g.BC), but also of the O3 recorded at CMN. In particular, the calculatedO3/CO ERs (0.10–0.17 ppbv/ppbv) were in the range of values found inliterature for relatively aged (2–4 days) BB plumes and suggestedsignificant photochemical O3 production during the air-mass transport.For fine particles and σp, the calculated ERs was higher in theBB plumes than during the anthropogenic pollution events, stressing theimportance of the identified BB event as a source of atmospheric aerosolable to affect the atmospheric radiation budget. These results suggest thatepisodes of mineral dust mobilization and wildfire emissions over NorthAfrica could significantly influence radiative properties (as deduced fromσp observations at CMN) and air quality over the Mediterraneanbasin and northern Italy

atmospheric chemistry and physics

Significant variations of trace gas composition and aerosol properties at Mt. Cimone during air mass transport from North Africa – contributions from wildfire emissions and mineral dust