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Radiative transfer modeling of filter-based measurements of light absorption by particles: Importance of particle size dependent penetration depth
- Source :
-
Journal of Aerosol Science . Apr2010, Vol. 41 Issue 4, p401-412. 12p. - Publication Year :
- 2010
-
Abstract
- Abstract: We present new physical models to interpret the response characteristics of filter-based measurements of aerosol light absorption. They were motivated by a recently found particle size dependence of a systematic bias in absorption measurements that cannot be interpreted by any models reported thus far. A theory of particle filtration by fibrous filter is applied to reproduce the penetration depth of particles into a filter matrix, and the light transmissivity of the matrix is calculated by the use of radiative transfer theory for plane-parallel layers. Optical properties of individual layers are calculated from microphysical properties and the number density of filter fibers and deposited particles. The size-dependent systematic bias in absorption measurement is successfully explained by the particle size dependence of penetration depth into a filter matrix. In practice the physical models developed here are useful for selecting operating conditions and filter matrices for instruments with fewer systematic biases. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00218502
- Volume :
- 41
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Aerosol Science
- Publication Type :
- Academic Journal
- Accession number :
- 48730698
- Full Text :
- https://doi.org/10.1016/j.jaerosci.2010.02.002