Capability of Superspheroids for Modeling ...
Document type :
Article dans une revue scientifique: Article original
DOI :
Permalink :
Title :
Capability of Superspheroids for Modeling PARASOL Observations Under Dusty-Sky Conditions
Author(s) :
Lin, W. [Auteur]
Zhejiang University [Hangzhou, China]
Bi, L. [Auteur]
Zhejiang University [Hangzhou, China]
Weng, F. [Auteur]
Chinese Academy of Meteorological Sciences [CAMS]
Li, Z. [Auteur]
Chinese Academy of Sciences [Beijing] [CAS]
Doubovik, Oleg [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Zhejiang University [Hangzhou, China]
Bi, L. [Auteur]
Zhejiang University [Hangzhou, China]
Weng, F. [Auteur]
Chinese Academy of Meteorological Sciences [CAMS]
Li, Z. [Auteur]
Chinese Academy of Sciences [Beijing] [CAS]
Doubovik, Oleg [Auteur]

Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Journal title :
Journal of Geophysical Research: Atmospheres
Abbreviated title :
J. Geophys. Res.-Atmos.
Volume number :
126
Pages :
-
Publication date :
2021-04-13
ISSN :
2169-897X
English keyword(s) :
dust aerosol
polarization
radiative transfer
scattering
polarization
radiative transfer
scattering
HAL domain(s) :
Planète et Univers [physics]/Océan, Atmosphère
English abstract : [en]
A comprehensive dust-particle geometry model is highly required for accurate computations of optical parameters in radiative transfer simulations and relevant remote sensing applications. In this study, a superspheroidal ...
Show more >A comprehensive dust-particle geometry model is highly required for accurate computations of optical parameters in radiative transfer simulations and relevant remote sensing applications. In this study, a superspheroidal model is proposed for simulating polarized radiation at the top of the atmosphere (TOA) under dusty-sky conditions. The superspheroidal model has one more degree of freedom than the spheroidal model. Sensitivity studies are first conducted to investigate how the additional freedom in the superspheroidal dust model affects the polarized signals at the TOA followed by an examination of the impact of particle size, complex refractive index, and surface properties on these polarized signals. The applicability of the superspheroidal model is then assessed for 11 selected dust events in three main dust source regions (namely, North Africa, Middle East, and the Taklamakan Desert). Specifically, the normalized polarized radiance as observed by the Polarization and Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar (PARASOL) are compared with simulations from an adding-doubling vector radiative transfer model. It is found that the concave superspheroidal model with large roundness parameters achieves favorable performances in fitting the angular distribution of the PARASOL polarized radiance. The optimal roundness parameter is found to be 2.6–3.0 and is consistent with recent comparison of the simulated scattering matrices and their laboratory measurement counterparts. These findings support the potential applicability of the superspheroidal model for polarized remote sensing applications.Show less >
Show more >A comprehensive dust-particle geometry model is highly required for accurate computations of optical parameters in radiative transfer simulations and relevant remote sensing applications. In this study, a superspheroidal model is proposed for simulating polarized radiation at the top of the atmosphere (TOA) under dusty-sky conditions. The superspheroidal model has one more degree of freedom than the spheroidal model. Sensitivity studies are first conducted to investigate how the additional freedom in the superspheroidal dust model affects the polarized signals at the TOA followed by an examination of the impact of particle size, complex refractive index, and surface properties on these polarized signals. The applicability of the superspheroidal model is then assessed for 11 selected dust events in three main dust source regions (namely, North Africa, Middle East, and the Taklamakan Desert). Specifically, the normalized polarized radiance as observed by the Polarization and Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar (PARASOL) are compared with simulations from an adding-doubling vector radiative transfer model. It is found that the concave superspheroidal model with large roundness parameters achieves favorable performances in fitting the angular distribution of the PARASOL polarized radiance. The optimal roundness parameter is found to be 2.6–3.0 and is consistent with recent comparison of the simulated scattering matrices and their laboratory measurement counterparts. These findings support the potential applicability of the superspheroidal model for polarized remote sensing applications.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Collections :
Submission date :
2024-01-16T22:20:15Z
2024-02-12T14:36:13Z
2024-02-12T14:36:13Z