Hebrew עברית

The mechanism of tornado and source of energy of tornado

  TITLE: Dynamics and thermodynamics of tornado: Rotation effects
 AUTHOR: Ben-Amots, N.
 SOURCE: Atmospheric Research, v. 178-179, pp. 320-328 (1st September 2016)
 ABSTRACT: This paper investigates the relevant processes in the tornado including the dynamics of rotation and thermodynamics as well as condensation. The main novelty of this paper is the explanation of the phenomena occurring in the central downflow. The reduced pressure in the tornado's funnel sucks air and water vapor from the cloud above the tornado. The latent heat of condensation is released in the funnel. The centrifugal force drives the generated water drops out of the funnel. The latent heat of condensation released is also transferred out of the funnel, and supplies the helically ascending air flow surrounding the tornado with additional buoyancy energy. This process gives the tornado increased strength compared to the dust devil type of flow, thus explaining why tornadoes occur always under a cloud, and why the tornado pipe can reach a height of a kilometer and more. To sustain a tornado, the temperature of water vapor at the cloud's base should be higher than the surroundings by a certain minimal value. Remote infrared temperature measurements of clouds' bases may provide indications of the probability that a cloud can spawn a tornado, which may increase the lead time.
 KEYWORDS: Mechanism of the tornado; Energy source of the tornado; Rotation of a tornado; Dynamics of a tornado; Heat transfer; Latent heat.

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"The author contributed a potentially better understanding of the rotation effects on the dynamics and thermodynamics of a tornado." Anonymous reviewer

"I found it very interesting and enlightening." K.P. (Greece)

 Cited by:

Pandey, S.M., Maurya, J.P.
"Exploration of characteristics governing dynamics of whirlwinds: application to dust devils,"
Zeitschrift fur Naturforschung A
Journal of Physical Sciences A

Mylonas, M.P., Nastos, P.T., Matsangouras, I.T.,
"PBL parameterization schemes sensitivity analysis on WRF modeling of a tornadic event environment in Skala Lakonia in September 2015,"
Atmospheric Research

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