INITIATION OF VORTEX FLOWS INDUCED BY DOUBLE DIFFUSION

The convection that owes its origin to double (differential) diffusion in a rotating medium in the gravity force fi eld may lead, generally speaking, to transfer of vorticity, and, in particular, to its concentration. As a rule, this is not considered in geophysical applications, since the spatial and time scales of such a convection and of rotation effects differ greatly — the period of planetary rotation is many orders of magnitude larger that the characteristic time of the existence of the corresponding convective structures in seawater. It is shown in the work that in the atmosphere the occurrence of the processes is possible, in which a noticeable transfer of the vorticity of such convection is more real. The effects of the type of double diffusion in air are possible in principle due to some difference in the rates of the transfer of heat, steam, and (or) of a heavy impurity. A linear model of the convection caused by double diffusion in a rotating medium is considered. In elaboration of the previous work of the author, a much more complex problem is considered with account for the temperature stratifi cation of the medium. Differential diffusion makes possible the vertical motions and concentration of vorticity despite the negative feedbacks, caused by the background stable stratifi cation of density.
The convection that owes its origin to double (differential) diffusion in a rotating medium in the gravity force fi eld may lead, generally speaking, to transfer of vorticity, and, in particular, to its concentration. As a rule, this is not considered in geophysical applications, since the spatial and time scales of such a convection and of rotation effects differ greatly — the period of planetary rotation is many orders of magnitude larger that the characteristic time of the existence of the corresponding convective structures in seawater. It is shown in the work that in the atmosphere the occurrence of the processes is possible, in which a noticeable transfer of the vorticity of such convection is more real. The effects of the type of double diffusion in air are possible in principle due to some difference in the rates of the transfer of heat, steam, and (or) of a heavy impurity. A linear model of the convection caused by double diffusion in a rotating medium is considered. In elaboration of the previous work of the author, a much more complex problem is considered with account for the temperature stratifi cation of the medium. Differential diffusion makes possible the vertical motions and concentration of vorticity despite the negative feedbacks, caused by the background stable stratifi cation of density.
Author:  L. Kh. Ingel
Keywords:  double (differential) diffusion, convection, rotating stratifi ed medium, heavy impurity, linear model, vorticity, concentration, atmosphere, whirlwind
Page:  648 -652