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Detailed Reference Information |
Chou, C.C.-K., Chen, W., Chang, S., Chen, T. and Huang, S. (2005). Specific absorption cross-section and elemental carbon content of urban aerosols. Geophysical Research Letters 32: doi: 10.1029/2005GL024301. issn: 0094-8276. |
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To investigate the light absorption efficiency of aerosols, samples of fine particulate matter (PM2.5) were collected during a field experiment in Taipei, Taiwan. Mass concentration and the elemental carbon (EC) content of the PM2.5 samples were measured, and in addition the light absorption cross-section of the EC in PM2.5 was derived. On average, elemental carbon contributed 8.6 ¿ 3.5 % to the PM2.5 mass. The aerosol light absorption coefficient was linearly proportional to the ambient EC concentration. Consequently, an average specific absorption cross-section of 10.8 ¿ 2.6 m2/g was obtained for EC in the aerosols. Analyses of the variations in the absorption cross-section revealed that the cross-section converged towards the average level as the ambient EC concentration increased. The scattering in the low EC regime is proposed to be due to differences in the mixing state: internal mixing enhanced the cross-section, whereas external mixing resulted in a decreasing trend. |
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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, Pollution, urban and regional (0305, 0478, 4251), Atmospheric Composition and Structure, Radiation, transmission and scattering |
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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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