Lorenz model, which describes convective air flows in the atmosphere, has been considered. Its solutions
are supplemented with inclusion of random actions representing stochastic temperature fluctuations. The influence
of the vertical temperature gradient (Rayleigh number) increase on system dynamics is studied. The revealed
patterns of the Lorenz system behaviour with an account of the stochastic component make it possible to explain
the observed tendencies in daily temperature dynamics in Nizhni Novgorod as a result of the temperature gradient
increase between upper and lower atmospheric layers.
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