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The single-scattering properties of black carbon aggregates determined from the geometric-optics surface-wave approach and the T-matrix method
SMHI, Research Department, Air quality.ORCID iD: 0000-0001-5695-1356
2013 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 125, p. 51-56Article in journal (Refereed) Published
Abstract [en]

The single-scattering properties of eight black carbon (BC, soot) fractal aggregates, composed of primary spheres from 7 to 600, computed by the geometric-optics surface-wave (GOS) approach coupled with the Rayleigh-Gans-Debye (RGD) adjustment for size parameters smaller than approximately 2, are compared with those determined from the superposition T-matrix method. We show that under the condition of random orientation, the results from GOS/RGD are in general agreement with those from T-matrix in terms of the extinction and absorption cross-sections, the single-scattering co-albedo, and the asymmetry factor. When compared with the specific absorption (m(2)/g) measured in the laboratory, we illustrate that using the observed radii of primary spheres ranging from 3.3 to 25 nm, the theoretical values determined from GOS/RGD for primary sphere numbers of 100-600 are within the range of measured values. The GOS approach can be effectively applied to aggregates composed of a large number of primary spheres (e.g., > 6000) and large size parameters (>> 2) in terms of computational efforts. (C) 2013 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2013. Vol. 125, p. 51-56
Keyword [en]
Black carbon, Soot, Aggregated aerosol, Geometric optics and surface wave, Rayleigh-Gans-Debye scattering, T-matrix method
National Category
Meteorology and Atmospheric Sciences
Research subject
Environment
Identifiers
URN: urn:nbn:se:smhi:diva-359DOI: 10.1016/j.jqsrt.2013.04.006ISI: 000321681500007OAI: oai:DiVA.org:smhi-359DiVA, id: diva2:802028
Available from: 2015-04-10 Created: 2015-03-31 Last updated: 2017-12-04Bibliographically approved

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Kahnert, Michael

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