Hydrodynamic Instability of the Periodic System of Updrafts and Downdrafts in the Atmosphere
- Authors: Kalashnik M.V.1,2, Kurgansky M.V.1
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Affiliations:
- Obukhov Institute of Atmospheric Physics
- Taifun Research and Production Association
- Issue: Vol 43, No 11 (2018)
- Pages: 729-736
- Section: Article
- URL: https://journals.rcsi.science/1068-3739/article/view/230788
- DOI: https://doi.org/10.3103/S1068373918110031
- ID: 230788
Cite item
Abstract
The linear hydrodynamic instability of the spatially periodic system of updrafts and downdrafts in a stably stratified atmosphere is studied. Such formulation of the problem is used to simulate the cloud systems observed in the atmosphere, when the zones of updrafts correspond to clouds and those of downdrafts correspond to intercloud intervals. A rather unexpected conclusion was made that the consideration of turbulent viscosity and thermal conductivity of the atmosphere as well as of radiative cooling leads to the instability at the Richardson numbers exceeding the critical value of 1/8 for the nondissipative case.
About the authors
M. V. Kalashnik
Obukhov Institute of Atmospheric Physics; Taifun Research and Production Association
Email: kurgansk@ifaran.ru
Russian Federation, Pyzhevskii per. 3, Moscow, 119017; pr. Lenina 82, Obninsk, Kaluga oblast, 249020
M. V. Kurgansky
Obukhov Institute of Atmospheric Physics
Author for correspondence.
Email: kurgansk@ifaran.ru
Russian Federation, Pyzhevskii per. 3, Moscow, 119017