气候变化领域集成服务门户(CCPortal): The electrical activity of Saharan dust as perceived from surface electric field observations

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DOI	10.5194/acp-21-927-2021
	The electrical activity of Saharan dust as perceived from surface electric field observations
	Daskalopoulou V.; Mallios S.A.; Ulanowski Z.; Hloupis G.; Gialitaki A.; Tsikoudi I.; Tassis K.; Amiridis V.
发表日期	2021
ISSN	1680-7316
起始页码	927
结束页码	949
卷号	21 期号:2
英文摘要	We report on the electric field variations during Saharan dust advection over two atmospheric remote stations in Greece, using synergistic observations of the vertical atmospheric electric field strength (Ez) at ground level and the lidar-derived particle backscatter coefficient profiles. Both parameters were monitored for the first time with the simultaneous deployment of a ground-based field mill electrometer and a multi-wavelength polarization lidar. The field mill time series are processed to extract the diurnal variations of the global electric circuit and remove fast field perturbations due to peak lightning activity. In order to identify the influence of the elevated dust layers on the ground Ez, we extract a localized reference electric field from the time series that reflects the local fair-weather activity. Then, we compare it with the reconstructed daily average behaviour of the electric field and the Saharan dust layers' evolution, as depicted by the lidar. The observed enhancement of the vertical electric field (up to g≈100 V m-1), for detached pure dust layers, suggests the presence of in-layer electric charges. Although higher dust loads are expected to result in such an electric field enhancement, episodic cases that reduce the electric field are also observed (up to g≈60 V m-1). To quantitatively approach our results, we examine the dependency of Ez against theoretical assumptions for the distribution of separated charges within the electrified dust layer. Electrically neutral dust is approximated by atmospheric conductivity reduction, while charge separation areas within electrically active dust layers are approximated as finite-extent cylinders. This physical approximation constitutes a more realistic description of the distribution of charges, as opposed to infinite-extent geometries, and allows for analytical solutions of the electric field strength so that observed variations during the monitored dust outbreaks can be explained. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168815
作者单位	Section of Astrophysics and Space Physics, Department of Physics, University of Crete, Heraklion, 70013, Greece; Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, 15236, Greece; Department of Earth and Environmental Sciences, University of Manchester, Manchester, M13 9PL, United Kingdom; British Antarctic Survey, NERC, Cambridge, CB3 0ET, United Kingdom; Department of Surveying and Geoinformatics Engineering, University of West Attica, Egaleo Campus, Egaleo, 12244, Greece; Laboratory of Atmospheric Physics, Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece; Section of Environmental Physics and Meteorology, National and Kapodistrian University of Athens, Athens, Greece; Institute for Theoretical and Computational Physics, Department of Physics, University of Crete, Heraklion, 70013, Greece; Institute of Astrophysics, Foundation for Research and Technology - Hellas, Heraklion, 71110, Greece
推荐引用方式 GB/T 7714	Daskalopoulou V.,Mallios S.A.,Ulanowski Z.,et al. The electrical activity of Saharan dust as perceived from surface electric field observations[J],2021,21(2).
APA	Daskalopoulou V..,Mallios S.A..,Ulanowski Z..,Hloupis G..,Gialitaki A..,...&Amiridis V..(2021).The electrical activity of Saharan dust as perceived from surface electric field observations.Atmospheric Chemistry and Physics,21(2).
MLA	Daskalopoulou V.,et al."The electrical activity of Saharan dust as perceived from surface electric field observations".Atmospheric Chemistry and Physics 21.2(2021).