Retrieval of Broadband Optical Properties from Ambient Aerosols Measurements Using Inverse Mie Calculations

Saseendran, Aiswarya; John, Shebin; Pakkattil, Anoop; Thomas, Arthur N.; Adiga, Sushmitha; Chen, Jun; Mazzoleni, Cláudio; Viswanath, Deepa; Varma, Ravi

doi:10.1007/s41810-021-00128-z

Cited by 1 publication

(2 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Verification of this assumption would have required the isolation of each particle’s unique mineralogy and morphology and how these parameters varied as a function of size and would have required extensive characterization of the sample using electron microscopy with elemental analysis. This analysis is beyond the scope of this manuscript …”

Section: Methodsmentioning

confidence: 99%

“…This analysis is beyond the scope of this manuscript. 48 The assumption of sphericity and homogeneity is fundamental to determining a particle size (here, D ve ) for the calculation of particle optical properties using the Mie theory. Previous investigations quantified χ for various individual components of terrestrial dusts and observed values of 1.00 ± 0.03 (quartz), 1.05 ± 0.03 (calcite), 0.97 ± 0.03 (dolomite), 1.30 ± 0.02 (illite), 1.05 ± 0.04 (kaolinite), and 1.11 ± 0.03 (montmorillonite).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

See 1 more Smart Citation

Absorption Spectra of Martian Dust Simulants

Razafindrambinina

Asa-Awuku

Radney

et al. 2022

ACS Earth Space Chem.

View full text Add to dashboard Cite

Understanding the Martian climate requires a detailed characterization of the optical properties of Martian dust as it is a ubiquitous component of the atmosphere. The continued improvement of Martian atmosphere observations motivates measurements of terrestrial simulants under controlled conditions to support field studies and computational modeling. This investigation demonstrates an in situ method to entrain and directly measure the absorption spectrum of six Martian dust simulants using photoacoustic spectroscopy. Measured size distributions and absorption cross sections (C abs) are used in Mie theory calculations to retrieve the effective imaginary component of the refractive index (k eff) of each sample while constraining the real component to n = 1.5, the refractive index of silica. The weakly absorbing simulants have k eff values ranging between 0.002 and 0.03 at a wavelength of 500 nm that are correlated with the mass fraction of iron oxides.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%