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. We report on an inter-comparison of black-carbon- andaerosol-absorption-measuring instruments with laboratory-generated sootparticles coated with controlled amounts of secondary organic matter (SOM).The aerosol generation setup consisted of a miniCAST 5201 Type BC burner forthe generation of soot particles and a new automated oxidation flow reactorbased on the micro smog chamber (MSC) for the generation of SOM from theozonolysis of α-pinene. A series of test aerosols was generated with elemental to total carbon (EC / TC) mass fraction ranging from about 90 % down to 10 % and single-scattering albedo (SSA at 637 nm) from almost 0 to about 0.7. A dual-spot Aethalometer AE33, a photoacoustic extinctiometer(PAX, 870 nm), a multi-angle absorption photometer (MAAP), a prototypephotoacoustic instrument, and two prototype photo-thermal interferometers(PTAAM-2λ and MSPTI) were exposed to the test aerosols in parallel.Significant deviations in the response of the instruments were observeddepending on the amount of secondary organic coating. We believe that thesetup and methodology described in this study can easily be standardised and provide a straightforward and reproducible procedure for theinter-comparison and characterisation of both filter-based and in situ black-carbon-measuring(BC-measuring) instruments based on realistic test aerosols.

atmospheric measurement techniques

Comparing black-carbon- and aerosol-absorption-measuring instruments – a new system using lab-generated soot coated with controlled amounts of secondary organic matter