CHARACTERISTICS OF FOGS IN THE KAZAKHSTAN SECTOR OF THE CASPIAN SEA

Abstract

In the research work, a statistical analysis of the fogs’ repeatability in the Kazakhstan sector of the Caspian Sea, continuous duration, wind speed and direction, relative humidity was carried out. Operational data of observations from the following stations were used: isl. Kulaly, Fort-Shevchenko, Aktau and Tushchibek. The research period was from 1970 till 2020. Statistical analysis made it possible to identify the highest frequency of occurrence by seasons, half-years, to estimate the continuous duration of fogs depending on the time of the year and the location of the observation point. The maximum duration of the phenomenon and the accompanying meteorological conditions are also noted. A comparative analysis of the Fort-Shevchenko and Aktau stations was carried out. This made it possible to highlight excellent areas of wind direction with the appearance of fogs. This is a consequence of different baro-circulation conditions for the formation of the phenomenon. In the conclusion of the work, that the highest frequency of fogs on the eastern coast of the Caspian Sea is observed in the transitional seasons of the year, with the exception of Aktau station, which is located much farther south of the other stations. The longest continuous duration of fogs at the stations of Fort-Shevchenko, isl. Kulaly and Tushchibek are recorded in winter, up to 6...8 days. At Aktau station up to 6...8 days in the warm half of the year. Duration more than 60 hours on isl. Kulaly is celebrated during the cold season; the maximum duration in Aktau and Tushchibek in recent decades is significantly less than at other stations; a comparative analysis revealed that in Aktau the highest frequency of occurrence is in the western and eastern sectors, and in Fort Shevchenko in the northern.