Light absorption properties of laboratory generated tar ball particles

Hoffer, András and Tóth, Ádám and Nyirő-Kósa, Ilona and Pósfai, Mihály and Gelencsér, András (2016) Light absorption properties of laboratory generated tar ball particles. Atmospheric Chemistry and Physics Discussions, 16. pp. 239-246. ISSN 1680-7367


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Tar balls (TBs) are a specific particle type which is abundant in the global troposphere, in particular in biomass smoke plumes. These particles belong to the family of atmospheric brown carbon (BrC) which can absorb light in the visible range of the solar spectrum. Albeit TBs are typically present as individual particles in biomass smoke plumes, their absorption properties have been only indirectly inferred from field observations or calculations based on their electron energy-loss spectra. This is because in biomass smoke TBs coexist with various other particle types (e.g. organic particles with inorganic inclusions and soot, the latter is emitted mainly during flaming conditions) from which they cannot be physically separated; thus, a direct experimental determination of their absorption properties is not feasible. Very recently we have demonstrated that TBs can be generated in the laboratory from droplets of wood tar that resemble atmospheric TBs in all of their observed properties. As a follow-up study we have installed on-line instruments to our laboratory set-up generating pure TB particles to measure the absorption and scattering, as well as size distribution of the particles. In addition, samples were collected for transmission electron microscopy (TEM) and total carbon (TC) analysis. The e�ects of experimental parameters were also studied. The mass absorption coe�cients of the laboratory generated TBs were found to be in the range of 0.8–3.0m2 g

Item Type: Article
Subjects: Q Science / természettudomány > QE Geology / földtudományok
Depositing User: Angelina Hofstedterné Jutasi
Date Deposited: 01 Feb 2016 11:25
Last Modified: 04 Apr 2023 11:21

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