The effect of complex black carbon microphysics on the determination of the optical properties of brown carbon
| Autor: | Liu, D T, Taylor, Jonathan, Young, D E, Flynn, M J, Coe, H, Allan, J D |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Liu, D T, Taylor, J, Young, D E, Flynn, M J, Coe, H & Allan, J D 2015, ' The effect of complex black carbon microphysics on the determination of the optical properties of brown carbon ' Geophysical Research Letters, vol. 42, no. 2, pp. 613-619 . https://doi.org/10.1002/2014GL062443 Liu, D T, Taylor, J, Young, D E, Flynn, M J, Coe, H & Allan, J D 2015, ' The effect of complex black carbon microphysics on the determination of the optical properties of brown carbon ', Geophysical Research Letters, vol. 42, no. 2, pp. 613-619 . https://doi.org/10.1002/2014GL062443 |
| DOI: | 10.1002/2014GL062443 |
| Popis: | Assessment of the impacts of brown carbon (BrC) requires accurate determination of its physical properties, but a model must be invoked to derive these from instrument data. Ambient measurements were made in London at a site influenced by traffic and solid fuel (principally wood) burning, apportioned by single particle soot photometer data and optical properties measured using multiwavelength photoacoustic spectroscopy. Two models were applied: a commonly used Mie model treating the particles as single-coated spheres and a Rayleigh-Debye-Gans approximation treating them as aggregates of smaller-coated monomers. The derived solid fuel BrC parameters at 405nm were found to be highly sensitive to the model treatment, with a mass absorption cross section ranging from 0.47 to 1.81m(2)/g and imaginary refractive index from 0.013 to 0.062. This demonstrates that a detailed knowledge of particle morphology must be obtained and invoked to accurately parameterize BrC properties based on aerosol phase measurements. |
| Databáze: | OpenAIRE |
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