Journal
ATMOSPHERIC ENVIRONMENT
Volume 144, Issue -, Pages 249-256Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2016.09.006
Keywords
Organic aerosol; Light absorption; Corn stalk; Pyrolysis; Spectral dependence
Funding
- U.S. DOE research grant: Isolating Weakly and Strongly-Absorbing Classes of Carbonaceous Aerosol: Optical Properties, Abundance and Wet Removal [A0871 DOE DE-SC0006689]
- National Natural Science Foundation of China [41275121, 41575119]
- China Scholarship Council
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Organic aerosol (OA) can absorb solar radiation in the low-visible and ultra-violet wavelengths thereby modifying radiative forcing. Agricultural waste burning emits a large quantity of organic carbon in many developing countries. In this work, we improved the extraction and analysis method developed by Chen and Bond, and extended the spectral range of OC absorption. We examined light absorbing properties of primary OA from pyrolysis of corn stalk, which is a major type of agricultural wastes. Light absorption of bulk liquid extracts of OA was measured using a UV vis recording spectrophotometer. OA can be extracted by methanol at 95%, close to full extent, and shows polar character. Light absorption of organic aerosol has strong spectral dependence (Absorption Angstrom exponent = 7.7) and is not negligible at ultra-violet and low-visible regions. Higher pyrolysis temperature produced OA with higher absorption. Imaginary refractive index of organic aerosol (k(OA)) is 0.041 at 400 nm wavelength and 0.005 at 550 nm wavelength, respectively. (C) 2016 Elsevier Ltd. All rights reserved.
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