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    Retrieval of the aerosol size distribution in the complex anomalous diffraction approximation

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    Franssens(2001d).pdf (188.4Kb)
    Authors
    Franssens, G.R.
    Discipline
    Physical sciences
    Subject
    Diffraction
    Particle size analysis
    Refractive index
    Scattering
    Troposphere
    Upper atmosphere
    Spectral extinction functions
    Aerosols
    aerosol
    Mie theory
    numerical method
    size distribution
    aerosol
    analytic method
    article
    atmospheric dispersion
    comparative study
    diffraction
    light absorption
    light scattering
    priority journal
    refraction index
    spectroscopy
    stratosphere
    troposphere
    Ada
    Audience
    Scientific
    Date
    2001
    Metadata
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    Description
    This contribution reports some recently achieved results in aerosol size distribution retrieval in the complex anomalous diffraction approximation (ADA) to MIE scattering theory. This approximation is valid for spherical particles that are large compared to the wavelength and have a refractive index close to 1. The ADA kernel is compared with the exact MIE kernel. Despite being a simple approximation, the ADA seems to have some practical value for the retrieval of the larger modes of tropospheric and lower stratospheric aerosols. The ADA has the advantage over MIE theory that an analytic inversion of the associated Fredholm integral equation becomes possible. In addition, spectral inversion in the ADA can be formulated as a well-posed problem. In this way, a new inverse formula was obtained, which allows the direct computation of the size distribution as an integral over the spectral extinction function. This formula is valid for particles that both scatter and absorb light and it also takes the spectral dispersion of the refractive index into account. Some details of the numerical implementation of the inverse formula are illustrated using a modified gamma test distribution. Special attention is given to the integration of spectrally truncated discrete extinction data with errors.
    Citation
    Franssens, G.R. (2001). Retrieval of the aerosol size distribution in the complex anomalous diffraction approximation. , Atmospheric Environment, Vol. 35, Issue 30, 5099-5104, DOI: 10.1016/S1352-2310(01)00331-4.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/5251
    doi: http://dx.doi.org/10.1016/S1352-2310(01)00331-4
    scopus: 2-s2.0-0034848503
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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