The applicability of physical optics in ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
The applicability of physical optics in the millimetre and sub-millimetre spectral region. Part II: Application to a three-component model of ice cloud and its evaluation against the bulk single-scattering properties of various other aggregate models
Auteur(s) :
Baran, Anthony J. [Auteur]
United Kingdom Met Office [Exeter]
Ishimoto, Hiroshi [Auteur]
Sourdeval, Odran [Auteur]
Leipziger Institut für Meteorologie [LIM]
Hesse, Evelyn [Auteur]
Centre for Atmospheric and Instrumentation Research [Hatfield] [CAIR]
Harlow, Chawn [Auteur]
United Kingdom Met Office [Exeter]
United Kingdom Met Office [Exeter]
Ishimoto, Hiroshi [Auteur]
Sourdeval, Odran [Auteur]
Leipziger Institut für Meteorologie [LIM]
Hesse, Evelyn [Auteur]
Centre for Atmospheric and Instrumentation Research [Hatfield] [CAIR]
Harlow, Chawn [Auteur]
United Kingdom Met Office [Exeter]
Titre de la revue :
Journal of Quantitative Spectroscopy and Radiative Transfer
Numéro :
206
Pagination :
83-100
Éditeur :
Elsevier BV
Date de publication :
2018-02
ISSN :
0022-4073
Mot(s)-clé(s) en anglais :
Electromagnetic scattering
Aggregates
Ice
Microwave
Particle size distribution
Physical optics
Remote sensing
Single-scattering
Sub-millimetre
Voronoi tessellation
Aggregates
Ice
Microwave
Particle size distribution
Physical optics
Remote sensing
Single-scattering
Sub-millimetre
Voronoi tessellation
Discipline(s) HAL :
Planète et Univers [physics]/Océan, Atmosphère
Résumé en anglais : [en]
The bulk single-scattering properties of various randomly oriented aggregate ice crystal models are compared and contrasted at a number of frequencies between 89 and 874 GHz. The model ice particles consist of the ten-branched ...
Lire la suite >The bulk single-scattering properties of various randomly oriented aggregate ice crystal models are compared and contrasted at a number of frequencies between 89 and 874 GHz. The model ice particles consist of the ten-branched plate aggregate, five-branched plate aggregate, eight-branched hexagonal aggregate, Voronoi ice aggregate, six-branched hollow bullet rosette, hexagonal column of aspect ratio unity, and the ten-branched hexagonal aggregate. The bulk single-scattering properties of the latter two ice particle models have been calculated using the light scattering methods described in Part I, which represent the two most extreme members of an ensemble model of cirrus ice crystals. In Part I, it was shown that the method of physical optics could be combined with the T-matrix at a size parameter of about 18 to compute the bulk integral ice optical properties and the phase function in the microwave to sufficient accuracy to be of practical value. Here, the bulk single-scattering properties predicted by the two ensemble model members and the Voronoi model are shown to generally bound those of all other models at frequencies between 89 and 874 GHz, thus representing a three-component model of ice cloud that can be generally applied to the microwave, rather than using many differing ice particle models. Moreover, the Voronoi model and hollow bullet rosette scatter similarly to each other in the microwave. Furthermore, from the various comparisons, the importance of assumed shapes of the particle size distribution as well as cm-sized ice aggregates is demonstrated.Lire moins >
Lire la suite >The bulk single-scattering properties of various randomly oriented aggregate ice crystal models are compared and contrasted at a number of frequencies between 89 and 874 GHz. The model ice particles consist of the ten-branched plate aggregate, five-branched plate aggregate, eight-branched hexagonal aggregate, Voronoi ice aggregate, six-branched hollow bullet rosette, hexagonal column of aspect ratio unity, and the ten-branched hexagonal aggregate. The bulk single-scattering properties of the latter two ice particle models have been calculated using the light scattering methods described in Part I, which represent the two most extreme members of an ensemble model of cirrus ice crystals. In Part I, it was shown that the method of physical optics could be combined with the T-matrix at a size parameter of about 18 to compute the bulk integral ice optical properties and the phase function in the microwave to sufficient accuracy to be of practical value. Here, the bulk single-scattering properties predicted by the two ensemble model members and the Voronoi model are shown to generally bound those of all other models at frequencies between 89 and 874 GHz, thus representing a three-component model of ice cloud that can be generally applied to the microwave, rather than using many differing ice particle models. Moreover, the Voronoi model and hollow bullet rosette scatter similarly to each other in the microwave. Furthermore, from the various comparisons, the importance of assumed shapes of the particle size distribution as well as cm-sized ice aggregates is demonstrated.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
CNRS
Collections :
Date de dépôt :
2023-01-06T12:39:01Z
2023-01-17T10:23:14Z
2023-01-17T10:23:14Z