ǂa ǂnew system using lab-generated soot coated with controlled amounts of secondary organic matter
Daniel M. Kalbermatter (Author), Griša Močnik (Author), Luka Drinovec (Author), Bradley Visser (Author), Jannis Röhrbein (Author), Matthias Oscity (Author), Ernest Weingartner (Author), Antti-Pekka Hyvärinen (Author), Konstantina Vasilatou (Author)

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 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 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 standardised and provide a straightforward and reproducible procedure for the inter-comparison and characterisation of both filter-based and in situ black-carbon-measuring (BC-measuring) instruments based on realistic test aerosols.

Keywords

black carbon;aerosol absorption;secondary organic aerosol;coating;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UNG - University of Nova Gorica
UDC: 502.3/.7
COBISS: 95895811 Link will open in a new window
ISSN: 1867-8548
Views: 920
Downloads: 38
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Other data

Secondary title: Comparing black-carbon- and aerosol-absorption-measuring instruments
URN: URN:SI:UNG
Pages: str. 561-572
Volume: ǂVol. ǂ15
Issue: ǂiss. ǂ2
Chronology: 2022
DOI: 10.5194/amt-15-561-2022
ID: 14418364
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