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

dc.contributor.authorFranssens, G.R.
dc.date2001
dc.date.accessioned2017-05-04T09:17:18Z
dc.date.available2017-05-04T09:17:18Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5251
dc.descriptionThis 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.
dc.languageeng
dc.titleRetrieval of the aerosol size distribution in the complex anomalous diffraction approximation
dc.typeArticle
dc.subject.frascatiPhysical sciences
dc.audienceScientific
dc.subject.freeDiffraction
dc.subject.freeParticle size analysis
dc.subject.freeRefractive index
dc.subject.freeScattering
dc.subject.freeTroposphere
dc.subject.freeUpper atmosphere
dc.subject.freeSpectral extinction functions
dc.subject.freeAerosols
dc.subject.freeaerosol
dc.subject.freeMie theory
dc.subject.freenumerical method
dc.subject.freesize distribution
dc.subject.freeaerosol
dc.subject.freeanalytic method
dc.subject.freearticle
dc.subject.freeatmospheric dispersion
dc.subject.freecomparative study
dc.subject.freediffraction
dc.subject.freelight absorption
dc.subject.freelight scattering
dc.subject.freepriority journal
dc.subject.freerefraction index
dc.subject.freespectroscopy
dc.subject.freestratosphere
dc.subject.freetroposphere
dc.subject.freeAda
dc.source.titleAtmospheric Environment
dc.source.volume35
dc.source.issue30
dc.source.page5099-5104
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/S1352-2310(01)00331-4
dc.identifier.scopus2-s2.0-0034848503


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