Abstract
The presented work is devoted to the study of ice deposits of the category of DP (dangerous) and SHP (spontaneous) of mass distribution in Ukraine during the last 30 years (1991-2020) at certain ten-year intervals. It is established that the period 1991-2000 will be distinguished by the total number of cases of mass distribution of ice deposits of the DP category, and the periods 2001-2010 and 2011-2020 are almost equivalent. The peculiarities of the manifestation of cases of mass deposition of ice of the DP category on the territory of Ukraine in separate months of the studied ten – year intervals are shown and the years in which such cases were the most are revealed. Thus, the largest number of such cases was observed in 1998, 1999, 2009, 2013, 2014, 2018. That is, in the last decade the number of years with such cases has increased slightly. It was found that in the studied decades the largest number of such cases was detected in the winter months (December-February), but from decade to decade they had their own dynamics, namely – their predominant increase in January (relative to 1991-2000) and volatile change in February and December (from period to period there is a variation in the number of cases). Thus, in February 2001-2010, compared to 1991-2000, there is an increase in the number of such cases, and in 2011-2020, on the contrary, there is a rather sharp decrease. In December 2001-2010, the number of such cases decreased slightly compared to 1991-2000, and in 2011-2020 slightly increased. In March, the number of cases of mass spread of ice deposits of the DP category did not change during the studied ten-year periods. In November, the largest number of such cases was observed during 1991-2000. The largest contribution to the number of such cases was in 1998 and 1999. During 2001-2010, it decreased significantly, and in the following decade 2011-2020 it more than doubled compared to with the last decade. Cases of mass deposition of ice in the SHP category have also changed over the decades under study. The largest number of them was observed during 1991-2000 and 2011-2020, and in the first decade they were mostly observed in November, and in the last in January. For the most part, ice deposits of the NE and OHS categories during their mass distribution are observed at 2 or 3-4 stations and within 2 (3-4) oblasts. However, in some cases, especially in the winter months, they may be larger.
Publisher
Taras Shevchenko National University of Kyiv
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