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Detailed Reference Information |
Schnaiter, M., Linke, C., Möhler, O., Naumann, K.-H., Saathoff, H., Wagner, R., Schurath, U. and Wehner, B. (2005). Absorption amplification of black carbon internally mixed with secondary organic aerosol. Journal of Geophysical Research 110: doi: 10.1029/2005JD006046. issn: 0148-0227. |
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The scattering and absorption properties of black carbon (BC) particles internally mixed with secondary organic aerosol (SOA) were investigated experimentally at the large aerosol chamber facility AIDA. Diesel soot particles were coated with secondary organic compounds produced by the in situ ozonolysis of α-pinene. It was found that the organic coating strongly affects the optical and microphysical properties of the soot aggregates. Amplification factors of the internally mixed BC of 1.8 to 2.1 compared to the specific absorption cross section of externally mixed BC were measured. These amplification factors are well reproduced by a Mie model for concentrically coated spheres over a wide range of organic coating/BC mixing ratios. Other optical properties in particular of thinly coated soot particles, namely, the single scattering albedo, the ¿ngstr¿m exponent, and the hemispheric backscattering ratio, are less well reproduced by the model, most likely because of the restructuring and the incomplete enclosure of the porous soot aggregates. |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Atmospheric Composition and Structure, Aerosols and particles (0345, 4801, 4906), Atmospheric Composition and Structure, Radiation, transmission and scattering, Atmospheric Composition and Structure, Troposphere, composition and chemistry, aerosol light absorption, aerosol optical properties, black carbon, secondary organic aerosol, internal mixing, coated sphere optical model |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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