In-situ observations of charged Saharan dust from an uncrewed aircraft system

Savvakis, V. ORCID: https://orcid.org/0000-0001-9568-1766, Schön, M., Nicoll, K. A. ORCID: https://orcid.org/0000-0001-5580-6325, Ryder, C. L. ORCID: https://orcid.org/0000-0002-9892-6113, Papetta, A., Kezoudi, M., Marenco, F. ORCID: https://orcid.org/0000-0002-1833-1102, Bange, J. and Platis, A. (2024) In-situ observations of charged Saharan dust from an uncrewed aircraft system. Aerosol Science and Technology. ISSN 1521-7388 doi: 10.1080/02786826.2024.2372399

Abstract/Summary

Mineral dust from the Sahara desert can travel long distances at high altitudes, perturbing the energy budget of the atmosphere. Charging of dust has been observed to occur near the surface through triboelectric charging during dust lofting, potentially affecting particle coagulation, fall speeds, and the lofting process itself. Apart from near-surface studies, measurements at elevated dust layers, where charge may play a role in particle long-range transport, are rare. This study presents new observations from an uncrewed aircraft system (UAS) of type MASC-3, through an elevated Saharan dust layer over Cyprus on 6 April 2022. The dust layer ranged from 1500 to 2500 meters above sea level (a.s.l), with maximum particle number concentrations (PNC) of 80–100 cm−3, primarily consisting of particles up to 2.5 µm in size. Measurements showed elevated charge within the dust layer, with magnitude proportional to PNC. It was concluded that there was a small influence of aircraft charge on the measurements, which was handled by developing a PNC-based correction factor. Corrected charge within the dust layer ranged from 0.2 to 3 pC m−3, with most of the charge at the upper and lower dust layer boundaries. The magnitude and location of the charge was consistent with predictions of ion-particle attachment. This suggests that most of the measured charge did not originate from the lofting process, but dust particles were charged on site through ion-particle attachment processes

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/117325
Identification Number/DOI	10.1080/02786826.2024.2372399
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	Taylor and Francis
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