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The chemical characterization of filter high volume (HV) and Berner impactor(BI) samples PM during RHaMBLe (Reactive Halogens in the Marine BoundaryLayer) 2007 shows that the Cape Verde aerosol particles are mainly composedof sea salt, mineral dust and associated water. Minor components arenss-salts, OC and EC. The influence from the African continent on theaerosol constitution was generally small but air masses which came fromsouth-western Europe crossing the Canary Islands transported dust to thesampling site together with other loadings. The mean mass concentration wasdetermined for PM10 to 17 μg/m3 from impactor samples and to24.2 μg/m3 from HV filter samples. Non sea salt (nss) componentsof PM were found in the submicron fractions and nitrate in the coarsemode fraction. Bromide was found in all samples with much depletedconcentrations in the range 1–8 ng/m3 compared to fresh sea saltaerosol indicating intense atmospheric halogen chemistry. Loss of bromide byozone reaction during long sampling time is supposed and resulted totally in82±12% in coarse mode impactor samples and in filter samples in88±6% bromide deficits. A chloride deficit was determined to 8%and 1% for the coarse mode particles (3.5–10 μm; 1.2–3.5 μm)and to 21% for filter samples. During 14 May with high mineral dust loads also the maximum of OC(1.71μg/m3) and EC (1.25 μg/m3) was measured. The minimum of TC(0.25 μg/m3) was detected during the period 25 to 27 May when puremarine air masses arrived. The concentrations of carbonaceous materialdecrease with increasing particle size from 60% for the ultra fineparticles to 2.5% in coarse mode PM. Total iron (dust vs. non-dust: 0.53 vs. 0.06 μg m3), calcium (0.22vs. 0.03 μg m3) and potassium (0.33 vs. 0.02 μg m3) were found asgood indicators for dust periods because of their heavily increasedconcentration in the 1.2 to 3.5 μm fraction as compared to theirconcentration during the non-dust periods. For the organic constituents,oxalate (78–151 ng/m3) and methanesulfonic acid (MSA, 25–100 ng/m3)are the major compounds identified. A good correlation betweennss-sulphate and MSA was found for the majority of days indicating activeDMS chemistry and low anthropogenic influences

Particle characterization at the Cape Verde atmospheric observatory during the 2007 RHaMBLe intensive