Assessing superspheroids in modeling the scattering matrices of dust aerosols

Lin, Wushao; Bi, Lei; Doubovik, Oleg

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1029/2018JD029464

Permalink :

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

Title :

Assessing superspheroids in modeling the scattering matrices of dust aerosols

Author(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]

Journal title :

Journal of Geophysical Research: Atmospheres

Abbreviated title :

J. Geophys. Res.-Atmos.

Volume number :

123

Publication date :

2018-12-27

ISSN :

2169-897X

English keyword(s) :

scattering matrix
dust
superspheroid

HAL domain(s) :

Physique [physics]

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Collections :

Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Submission date :

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

Version	Link	Modification date
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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