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Light Absorption Properties of Laboratory Generated Tar Ball Particles : Volume 15, Issue 12 (16/06/2015)

By Hoffer, A.

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Book Id: WPLBN0003991018
Format Type: PDF Article :
File Size: Pages 20
Reproduction Date: 2015

Title: Light Absorption Properties of Laboratory Generated Tar Ball Particles : Volume 15, Issue 12 (16/06/2015)  
Author: Hoffer, A.
Volume: Vol. 15, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Nyirő-Kósa, I., Gelencsér, A., Tóth, A., Pósfai, M., & Hoffer, A. (2015). Light Absorption Properties of Laboratory Generated Tar Ball Particles : Volume 15, Issue 12 (16/06/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: MTA-PE Air Chemistry Research Group, Veszprém, P.O. Box 158, 8201, Hungary. 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 effects of experimental parameters were also studied. The mass absorption coefficients of the laboratory generated TBs were found to be in the range of 0.8–3.0 m2 g−1 at 550 nm, with absorption Ångström exponents (AAE) between 2.7 and 3.4 (average 2.9) in the wavelength range 467–652 nm. The refractive index of TBs as derived from Mie calculations was about 1.84–0.21i at 550 nm. In the brown carbon continuum these values fall closer to those of soot than to other light-absorbing species such as humic-like substances (HULIS). Considering the abundance of TBs in biomass smoke and the global magnitude of biomass burning emissions, these findings may have substantial influence on the understanding of global radiative energy fluxes.

Summary
Light absorption properties of laboratory generated tar ball particles

Excerpt
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