Title :

First complex refractive indices retrieval from FIR to UV: Application to kaolinite particles

Author(s) :

Chehab, Maria [Auteur]
Physicochimie des Processus de Combustion et de l'Atmosphère (PC2A) - UMR 8522
Herbin, Herve [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Deguine, Alexandre [Auteur]
Physicochimie des Processus de Combustion et de l'Atmosphère (PC2A) - UMR 8522
Gosselin, Sylvie [Auteur]
Physicochimie des Processus de Combustion et de l'Atmosphère (PC2A) - UMR 8522
Bizet, Valentine [Auteur]
Physicochimie des Processus de Combustion et de l'Atmosphère (PC2A) - UMR 8522
Petitprez, Denis [Auteur]
Physicochimie des Processus de Combustion et de l'Atmosphère (PC2A) - UMR 8522

Journal title :

Aerosol Sci. Technol.

Abbreviated title :

Aerosol Sci. Technol.

Volume number :

-

Pages :

-

Publication date :

2024-03-20

ISSN :

0278-6826

HAL domain(s) :

Planète et Univers [physics]/Océan, Atmosphère

English abstract : [en]

Knowledge of the optical properties, in particular the complex refractive indices (CRI), of aerosols is crucial to better quantify their impact on the environment from remote sensing techniques. However, the CRI data ...
Show more >Knowledge of the optical properties, in particular the complex refractive indices (CRI), of aerosols is crucial to better quantify their impact on the environment from remote sensing techniques. However, the CRI data available in the literature provide mainly reflectance measurements on bulk materials or pressed pellets and span over limited wavelength ranges. Here, we present an improved retrieval methodology combining an experimental setup that allows simultaneously the measurement of high spectral-resolution extinction spectra (up to 0.5 cm−1) and the recording of the size distribution (SD) of both fine (down to 10 nm) and coarse (up to 20 µm) particles. Introducing these experimental measurements in a numerical iterative process, the real and imaginary parts of the CRI are retrieved using an optimal estimation method (OEM) associated with scattering theories and the single subtractive Kramers–Kronig (SSKK) relation. Using this methodology, we are able to accurately determine for the first time CRI of an aerosol flow for kaolinite over a wide spectral range from far infrared (FIR) (50 µm/200 cm−1) up to UV (0.25 µm/40,000 cm−1). The mean values of the total uncertainty of the retrieved real and imaginary parts are 1.6% and 0.6%, respectively.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

• Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
• Physicochimie des Processus de Combustion et de l'Atmosphère (PC2A) - UMR 8522

Submission date :

2024-05-06T22:22:04Z
2024-06-05T06:20:54Z