Geophysical processes and biosphere: article

Аnnotation: By using a non-stationary numerical thermohydrodynamic model of atmospheric tides genesis and evolution in the Earthʼs atmosphere it is shown that the Moon can initiate the growing unstable non-stationary disturbances of meteorological parameters in the troposphere. It should be noted that genesis of such disturbances is initiated by atmospheric lunar tides. The major factor of genesis of disturbances is shown to be atmospheric compressibility, while the complementary factor is represented by vertical background wind shear (baroclinic instability). The calculated spatial and temporal scales of unstable disturbances initiated by atmospheric lunar tides vary within the following ranges: characteristic build-up time - 50 to 200 hours; quasi period of unstable disturbances - 7 to 30 days. The resulting spatial and temporal scales of initiated unstable disturbances allow these to be referred to the category of global meteorological processes. The results of numerical experiments on genesis and evolution of unstable disturbances initiated by atmospheric lunar semidiurnal tide are given as an example. For the unstable disturbance under consideration, the characteristic time of the amplitude buildup varies from 90 hours in the winter to 150 hours in the summer. The quasi period for unstable disturbance is about 15 days in the winter and this increases to 27 days in the summer. From analyzing the results of numerical experiments, it may be concluded that the Moon-initiated global unstable non-stationary disturbances can create weather cycles in the mid- and high-latitude troposphere of the two hemispheres of duration from one to four weeks. The initial phase of genesis of these cycles is closely connected with the continuously varying position of the gravitational tide-forming source on the celestial sphere, i.e. with the lunar phase. The conclusion presents arguments for the similar effect of the planets of the Solar System, through gravitational tides and instability of the Earthʼs atmosphere and the Earthʼs weather.