Spatial-temporal structure of zones of turbulence of a clear sky of high intensity

Abstract

In the presented work, a spatial-temporal analysis of the most intense clear sky turbulence zones (CAT) has been conducted, which have a direct impact on the flight mode of almost all types of aircraft and affects the profitability of air transportation. The study was carried out by constructing vertical sections of the atmosphere perpendicular to and parallel to the axis of the basin, which is associated with the current flow. This made it possible to investigate the spatial-temporal transformation of zones with extremely high values of turbulence. In particular, the height of their location, the position relative to the axis of the basin, the spatial dimensions and patterns of changes in these characteristics are established at the redevelopment of the field of geopotential. Changing the position of the axillary basin does not result in a simultaneous change in the location of the CAT zone relative to it. The transformation of the spatial structure of the zone of intense turbulence occurs within 12 hours after the reconstruction of the field of geopotential. Construction of vertical profiles of the direction and wind speed and its displacement allowed to determine the meteorological conditions under which the formation of zones of extreme high turbulence occurs. Thus, the turbulence zones, which are located in the upper troposphere, are formed under conditions of a jet-like wind profile and do not change its direction. Nizhnyotropospheric zones of turbulence, instead, are formed in conditions of sharp changes in both direction and wind speed. The result also found that the zones of extreme values of SATs can be formed under conditions of wind displacement in the lower half of the troposphere, and in the upper. In the first case, the windshift is characterized by an increase in the speed of the wind with a height, in the second - a weakening. The intensity of the SAT zone depends on the intensity of the jet stream and the magnitude of the vertical wind shear that it causes. Reducing the intensity of the jet stream leads to a decrease in the intensity of the turbulence of the clear sky in its places of existence while preserving the configuration of the baroque relief. The zone of the most intense values of SAT is located in the anterior part of the basin with cyclonic side of the jet stream near its axis.