Abstract
For many years, the interaction between dust particles and water molecules has been a subject of interest for the atmospheric sciences community. However, the influence of the particle size on the hygroscopicity of mineral particles is poorly evaluated. In the current study, diffused reflectance infrared Fourier transform (DRIFT) spectroscopy is used to evaluate the in situ water adsorption on natural Arizona test dust (ATD) particles. Five different ATD size fractions, 0–3, 5–10, 10–20, 20–40, and 40–80 μm, are used, corresponding to the entire range of uplifted mineral particles in the atmosphere (<100 μm). N2 sorption measurement, particle size distribution, and elemental analyses are performed to determine the physicochemical properties of the samples. The water adsorption experiments are conducted in an optical cell under flow conditions at room temperature and under the relative humidity (RH) range of 2–90%. Experimental results are simulated with a modified three-parameter Brunauer–Emmett–Teller (B...
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