Published Article

LINEAR STABILITY INVESTIGATION OF AN ACTIVE ATMOSPHERIC WARM CLOUD FLOW

R. N. Djue ; S. K. K. Yanga

2014
UFR of Mathematics and Computer Sciences Université Félix Houphoët-Boigny

Abstract: In this paper, the linear stability of an active cloud is investigated. A Jean scale of about 8.75 km thick is revealed in which small cumuli can grow up within a vertically 2.5 km large band. The study revealed that internal waves are stable and exhibit an acoustic behavior while the mechanism sustaining the flow instability is found to be gravity-driven. The further analysis revealed that at the first stage, the entrainment process is required for the cloud to be fed in water vapor until the droplets can grow by self-conversion, collision, accretion, coalescence and overcome the updraft winds. From this stage, the gravity effects become the dominant instability mechanism that drives the cloud dynamics from a passive to an active behavior.

Keyword(s): stability ; dispersion relation ; cloud ; cumulus ; mixing ratio

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 Record created 2018-12-07, last modified 2019-01-15



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