期刊
JOURNAL OF AEROSOL SCIENCE
卷 41, 期 4, 页码 401-412出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jaerosci.2010.02.002
关键词
Light absorption; Filter-based measurements; Filtration; Radiative transfer; Multiple scattering
类别
资金
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- Japanese Ministry of the Environment [B-083]
- Nagoya University
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. (C) 2010 Elsevier Ltd. All rights reserved.
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