Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 4 2010 10.5194/acp-10-1773-2010 http://www.atmos-chem-phys.net/10/1773/2010/ http://www.atmos-chem-phys.net/10/1773/2010/acp-10-1773-2010.html http://www.atmos-chem-phys.net/10/1773/2010/acp-10-1773-2010.pdf 1773 1787 2010-02-16 Light absorption by organic carbon from wood combustion Y. Chen T. C. Bond yark@uiuc.edu University of Illinois, Champaign-Urbana, IL, USA Carbonaceous aerosols affect the radiative balance of the Earth by absorbing and scattering light. While black carbon (BC) is highly absorbing, some organic carbon (OC) also has significant absorption, especially at near-ultraviolet and blue wavelengths. To the extent that OC absorbs visible light, it may be a non-negligible contributor to positive direct aerosol radiative forcing. Quantification of that absorption is necessary so that radiative-transfer models can evaluate the net radiative effect of OC. <br><br> In this work, we examine absorption by primary OC emitted from solid fuel pyrolysis. We provide absorption spectra of this material, which can be related to the imaginary refractive index. This material has polar character but is not fully water-soluble: more than 92% was extractable by methanol or acetone, compared with 73% for water and 52% for hexane. Water-soluble OC contributes to light absorption at both ultraviolet and visible wavelengths. However, a larger portion of the absorption comes from OC that is extractable only by methanol. Absorption spectra of water-soluble OC are similar to literature reports. We compare spectra for material generated with different wood type, wood size and pyrolysis temperature. 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