The Electrical Activity of Saharan Dust as perceived from Surface Electric Field Observations in Greece

doi:10.5194/acp-2020-668

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-668
	The Electrical Activity of Saharan Dust as perceived from Surface Electric Field Observations in Greece
	Vasiliki Daskalopoulou, Sotirios A. Mallios, Zbigniew Ulanowski, George Hloupis, Anna Gialitaki, Konstantinos Tassis, and Vassilis Amiridis
	2020-07-27
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
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 (E_z) at ground 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 multiwavelength lidar system. The field mill timeseries 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 E_z, we extract a Localized Reference Electric Field from the timeseries 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 system. Reported cases of enhanced vertical electric field for detached pure dust layers suggest the presence of in-layer electric charges. Although higher dust loads are expected to result in electric field enhancement, episodic cases that reduce the electric field are also observed. To quantitatively approach our results, we examine the dependency of E_z 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 electric field variations during the monitored dust outbreaks can be explained.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/286660
专题	地球科学
推荐引用方式 GB/T 7714	Vasiliki Daskalopoulou, Sotirios A. Mallios, Zbigniew Ulanowski, George Hloupis, Anna Gialitaki, Konstantinos Tassis, and Vassilis Amiridis. The Electrical Activity of Saharan Dust as perceived from Surface Electric Field Observations in Greece[J]. Atmospheric Chemistry and Physics,2020.
APA	Vasiliki Daskalopoulou, Sotirios A. Mallios, Zbigniew Ulanowski, George Hloupis, Anna Gialitaki, Konstantinos Tassis, and Vassilis Amiridis.(2020).The Electrical Activity of Saharan Dust as perceived from Surface Electric Field Observations in Greece.Atmospheric Chemistry and Physics.
MLA	Vasiliki Daskalopoulou, Sotirios A. Mallios, Zbigniew Ulanowski, George Hloupis, Anna Gialitaki, Konstantinos Tassis, and Vassilis Amiridis."The Electrical Activity of Saharan Dust as perceived from Surface Electric Field Observations in Greece".Atmospheric Chemistry and Physics (2020).