Total vapor content of the atmosphere is a primary factor in diagnosing thermal conditions and determining areas of possible aircraft icing. This study for the period from October 1, 2018 to March 31, 2020, is based the AV-6 electronic weather logs and crew weather reports (PIREP). The paper considers the ranges of the total vapor content Q and total vapor content during icing Qi for the seasons most favorable for the icing occurance. Icing is observed at values of the total vapor content Qi from 0.3 to 1.5 g/cm2.
Seasonal characteristics of the distribution of the total vapor content of the atmosphere and the characteristics of cloudiness and wind in the area of St. Petersburg airport are described for the period from October 1, 2018 to September 30, 2020. The St. Petersburg airport is subject to humid sea air from the Atlantic, which is most significant in the autumn and winter periods. The intensity of atmospheric circulation decreases in summer. The summer period has a peak in the distribution of the total vapor content of the atmosphere and the height of the cloud base shifted to higher values. On the contrary, the distribution of wind speed in the area of the Pulkovo airfield practically does not change depending on the season.
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