Assessing superspheroids in modeling the scattering matrices of dust aerosols

Lin, Wushao; Bi, Lei; Doubovik, Oleg

Type de document :

Article dans une revue scientifique: Article original

DOI :

10.1029/2018JD029464

URL permanente :

http://hdl.handle.net/20.500.12210/105117

Titre :

Assessing superspheroids in modeling the scattering matrices of dust aerosols

Auteur(s) :

Lin, Wushao [Auteur]
Zhejiang University [Hangzhou, China]
Bi, Lei [Auteur]
Zhejiang University [Hangzhou, China]
Doubovik, Oleg [Auteur]

Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]

Titre de la revue :

Journal of Geophysical Research: Atmospheres

Nom court de la revue :

J. Geophys. Res.-Atmos.

Numéro :

123

Date de publication :

2018-12-27

ISSN :

2169-897X

Mot(s)-clé(s) en anglais :

scattering matrix
dust
superspheroid

Discipline(s) HAL :

Physique [physics]

Résumé en anglais : [en]

Atmospheric dust particles are known to have diverse and irregular morphologies. In order to account for nonsphericity, the spheroidal model with an aspect ratio distribution has been extensively used for modeling the ...
Lire la suite >Atmospheric dust particles are known to have diverse and irregular morphologies. In order to account for nonsphericity, the spheroidal model with an aspect ratio distribution has been extensively used for modeling the optical properties of dust. The spheroidal model is superior to the spherical shape assumption, but it requires further improvement. In this study, superspheroids' modeling capabilities were systematically examined by comprehensively comparing the spheroid's and superspheroid's scattering matrices. Superspheroids have one more degree of freedom than spheroids and can be nonspherical at an aspect ratio of unity. The invariant imbedding T-matrix and the improved geometrical optics methods were employed to compute superspheroids' single-scattering properties with a wide distribution of aspect ratios and a number of roundness parameters. We then assessed the spheroidal and superspheroidal models' applicability for simulating the scattering matrices of 25 dust samples from the Amsterdam-Granada Light Scattering Database. It was found that extreme aspect ratios for spheroids in reproducing the measurements were unnecessary if superspheroids were used. Even with equi-probable aspect ratio distribution, superspheroids with constrained roundness parameters (from 2.4 to 3.0) could achieve better performances in concurrently matching six nonzero scattering matrix elements from the laboratory measurements. Moreover, superspheroids demonstrated better performances than spheroids in achieving spectral consistency for modeling dust scattering matrices. Therefore, superspheroids appear to be highly promising for atmospheric radiative transfer and remote sensing applications.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Collections :

Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Date de dépôt :

2024-01-30T11:45:57Z
2024-02-23T14:55:20Z

Numéro de version	Lien	Date de modification
2	20.500.12210/105117*	2024-02-23T14:52:40Z
1	20.500.12210/105117.1	2024-01-30T11:45:57Z

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Assessing superspheroids in modeling the ...

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