Preprints
https://doi.org/10.5194/amt-2021-214
https://doi.org/10.5194/amt-2021-214

  21 Jul 2021

21 Jul 2021

Review status: this preprint is currently under review for the journal AMT.

Response of black carbon and aerosol absorption measuring instruments to laboratory-generated soot coated with controlled amounts of secondary organic matter

Daniel M. Kalbermatter1, Griša Močnik2,3,4, Luka Drinovec2,3,4, Bradley Visser5, Jannis Röhrbein5, Matthias Oscity5, Ernest Weingartner5, Antti-Pekka Hyvärinen6, and Konstantina Vasilatou1 Daniel M. Kalbermatter et al.
  • 1Laboratory Particles and Aerosols, Federal Institute of Metrology METAS, Bern-Wabern, 3003, Switzerland
  • 2Center for Atmospheric Research, University of Nova Gorica, Nova Gorica, 5270, Slovenia
  • 3Haze Instruments d.o.o., Ljubljana, 1000, Slovenia
  • 4Department of Condensed Matter Physics, Jozef Stefan Institute, Ljubljana, 1000, Slovenia
  • 5Institute for Sensors and Electronics, University of Applied Sciences Northwestern Switzerland FHNW, Windisch, 5210, Switzerland
  • 6Finnish Meteorological Institute, Helsinki, 00560, Finland

Abstract. We report on an inter-comparison of black carbon and aerosol absorption measuring instruments with laboratory-generated soot particles coated with controlled amounts of secondary organic matter (SOM). The aerosol generation setup consisted of a miniCAST 5201 Type BC burner for the generation of soot particles and a new automated oxidation flow reactor based on the micro smog chamber (MSC) for the generation of SOM from the ozonolysis of α-pinene. A series of test aerosols were generated with elemental to total carbon (EC/TC) mass fraction ranging from about 90 % down to 10 % and single scattering albedo (SSA) 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 prototype photoacoustic 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 observed depending on the amount of secondary organic coating. We believe that the setup and methodology described in this study can easily be standardized and provide a straightforward and reproducible procedure for the inter-comparison and characterisation of both filter-based and in situ BC-measuring instruments based on realistic test aerosols.

Daniel M. Kalbermatter et al.

Status: open (until 26 Aug 2021)

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Daniel M. Kalbermatter et al.

Daniel M. Kalbermatter et al.

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Short summary
Soot particles with varying amounts of secondary organic matter coating were generated and used to compare a series of aerosol absorption measuring instruments: filter-based and photoacoustic instruments as well as photothermal interferometers. Significant deviations in the response of the instruments were observed depending on the amount of secondary organic coating. The system can be used for the inter-comparison and characterisation of instruments.