Overheat Instability in an Ascending Moist Air Flow as a Mechanism of Hurricane Formation

Details Overheat Instability in an Ascending Moist Air Flow as a Mechanism of Hurricane Formation Overheat Instability in an Ascending Moist Air Flow as a Mechanism of Hurricane Formation

2011-06-27

arxiv.org/abs/1106.5478v1

Physics

Atmospheric and Oceanic Physics

15 pages,7 figures

Scientific paper

The universal instability mechanism in an ascending moist air flow is theoretically proposed and analyzed. Its origin comes to the conflict between two processes: the increasing of pressure forcing applied to the boundary layer and the decelerating of the updraft flow due to air heating. It is shown that the intensification of tropical storm with the redistribution of wind velocities, pressure and temperature can result from the reorganization of the dissipative structure which key parameters are the moist air lifting velocity and the temperature of surrounding atmosphere. This reorganization can lead to formation of hurricane eye and inner ring of convection. A transition of the dissipative structure in a new state can occur when the temperature lapse rate in a zone of air lifting reaches certain critical value. The accordance of observational data with the proposed theoretical description is shown.

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