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.
Dynamics and statistics of the total content of supercooled water were studied using real-time radiometry methods in the period from November 2016 to January 2017, when aircraft icing was observed at the Tomsk airport. The histogram of the total water content is single-modal and shifted to the left; and the temperature histogram is bimodal. The minimum and maximum values of the total water content are 0 kg/m2 and 1.5 kg/m2 , respectively; and the minimum and maximum temperatures are – 19° C and 0° C. The bimodality of the temperature histogram represents two combined processes that occur during the supercooled water droplets formation in the considered period. The first process is connected with the change of the season of the year, the second - with the arrival of warm and moist air masses to the cold territory.
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