ИСТИНА

The height of the ground air layer has been studied with the use of the sodar data about monthly-averaged profiles of wind direction in Moscow city for period 2004-2010. This parameter was supposed to be equal to the first level at which stable wind turning with a height is observed on a profile. As it is shown nearly at one third of cases this height was equal to 60 m or, sometimes, even higher – 80 or 100 m. In the rest of cases wind turning has been found at whole the range of the sodar data above ‘dead-zone’ of the sodar which is equal to 40 m. Thus, in the most of cases the ground air layer height is equal probably to 40 m or less. At the diurnal course the height of the ground air layer in average of several summer months is the most in the afternoon (from 80 to 100 m) and the least – at night (40 m or less).