Observations of Saharan dust layer electrification

K.A. Nicoll, R.G. Harrison, Z. Ulanowski

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    Abstract

    Electrification of atmospheric dust influences the coagulation, wet removal and fall speeds of dust particles. Alignment of dust particles can also occur in fair weather atmospheric electrical conditions if the particles are charged. However, very few electrical measurements made in elevated dust layers exist. Balloon-borne charge and particle instrumentation have been used to investigate the electrical properties of elevated Saharan dust layers. Soundings from the Cape Verde Islands, which experience frequent Saharan dust outbreaks, intercepted several dust layers. Two balloon soundings during summer 2009 detected dust particles in layers up to 4 km altitude. Simultaneous electrical measurements showed charge inside the dust layers, with a maximum measured charge density of 25 pC m(-3), sufficient to influence wet removal processes.
    Original languageEnglish
    Article number014001
    Number of pages7
    JournalEnvironmental Research Letters
    Volume6
    Issue number1
    DOIs
    Publication statusPublished - 2011

    Keywords

    • aerosol electrification
    • Cape Verde
    • Martian dust
    • atmospheric aerosol

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