Laboratory study of mineral dust optical properties extending in the far-infrared spectral range

Abstract

Mineral dust is one of the most abundant atmospheric aerosol types and remains a major source of uncertainty in estimates of aerosol radiative forcing. This uncertainty is particularly important in the far-infrared (FIR) spectral region, where the optical properties of natural mineral dust, especially its complex refractive index (CRI), remain poorly known. Previous measurements have commonly relied on pellet- or film-based methods, which can alter particle size, shape, and vibrational modes, inducing errors in the CRI determination. In this study, we present a laboratory investigation on six natural mineral dust samples with contrasting compositions and originated from major dust source regions worldwide, including Arizona, Atacama, China, Niger, Saudi Arabia, and Tunisia. Suspended dust aerosols were generated under controlled dry conditions and characterized using extinction spectroscopy from the infrared 250 to 4000 cm^-1 (2.5 to 40 micrometers) to the Ultraviolet-Visible (UV-Vis) from 10000 to 40000 cm^-1 (0.25 to 1 micrometer) spectral range, combined with particle size distribution measurements. The real and imaginary parts of the CRI were retrieved for all six samples, revealing a significant absorption and pronounced spectral variability in the FIR. These variations should be accounted for in remote sensing and dust radiative effect studies.

arXiv commentThe main article and supplementary material are merged in the same pdf file. Main article of 39 pages, 7 figures (legends are found at the end of the article). Supplementary material: 19 pages, 9 figures