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Aircraft observations of electrical conductivity in warm clouds

Raj, PE and Devara, PCS and Selvam, AM and Murty, ASR (1993) Aircraft observations of electrical conductivity in warm clouds. Advances in Atmospheric Sciences, 10 (1). pp. 95-102.

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Abstract

Aircraft observations of electrical conductivity and cloud microphsical, dynamical and other electrical parameters were made in warm stratocumulus and cumulus clouds forming during the summer monsoon seasons (June-September) of 1983 and 1985 in the Deccan Plateau region, India. A Gerdien type cylindrical condenser was used for the measurement of electrical conductivity. The variations in the electrical conductivity are observed to be closely associated with the updrafts and downdrafts in the cloud, liquid water content, cloud droplet charge and corona discharge current. The value of electrical conductivity in warm clouds is found to be in the order of 10-12 ohm-1 m-1 which is two orders higher than that observed in clear-air at cloud-base levels in some regions by other investigators. Classical static electricity concepts predict reduced conductivity values inside clouds. Cloud electrical conductivity measurements, particularly in warm clouds are few and the results are contradictory. The recently identified mechanism of vertical mixing in clouds lends support to convective charge separation mechanism with inherent larger than clear-air values for cloud electrical conductivity and therefore consistent with the measurements reported herein.

Item Type: Article
Additional Information: Copyright of this article belongs to Science Press
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 15 May 2015 09:10
Last Modified: 15 May 2015 09:10
URI: http://moeseprints.incois.gov.in/id/eprint/1079

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