DEPOSITION OF DP SOFT RIME (DANGEROUS PHENOMENA) ON THE TERRITORY OF UKRAINE DURING THE PERIOD OF THE STANDARD CLIMATOLOGICAL NORM OF 1961-1990 AND FOR ITS SEPARATE DECADES
Authors: Pyasetska S.I. 
Published: May 2021

To clarify the features of the spatio-temporal distribution of soft rime deposits of the category DP (dangerous phenomena) over the course of the standard climatological norm of 1961-1990 materials of observations of such sediments were analyzed on a standard ice machine at all meteorological stations in Ukraine. The spatial-temporal character of the distribution of such sediments in the territory of Ukraine for each of the studied months of the cold and individual months of the transitional seasons of the year was obtained. Similar work was carried out for each separate decade during the total thirty-year study period. The years and months when such types of ice-rime deposits were the most were revealed, the contribution of each year and month to their total number was calculated. The places and regions of the greatest manifestation of DP category soft rime deposits on the territory of Ukraine during the standard climatological norm of 1961-1990 were established.
A number of conclusions were obtained regarding the state of spatio-temporal distribution and the number of deposits of soft rime DP category during 1961-1990 on the territory of Ukraine, namely:
– From 1961-1990, the largest number of cases of soft rime deposits of the DP category was observed in January, February and December of the study period.
– In most cases, the vast majority of cases of frost deposition of the DP category were observed in the Transcarpathian region on the Play and in the Autonomous Republic of Crimea on the Ai-Petri .
– Mostly the number of cases of such deposits at stations was isolated, but in some years and months at a number of stations there was a much larger number of such cases. January-December stands out the most, and among the Play and Ai-Petri stations.
– The largest number of cases of soft rime deposits of the DP category was observed in the winter months, especially in January and December. During 1971-1980 and 1981-1990, a significant increase in such cases was observed in November, especially in 1971-1980. In the first decade of the standard climatological norm, this was not observed, the number of cases in March was equal to their number in November.
– There is a tendency to increase the number of cases of DP soft rime deposits in December during 1971-1980 and 1981-1990, in contrast to 1961-1970, when the largest number was observed in January.
– It is established that most cases of soft rime deposits of the DP category were observed during 1971-1980.
– During 1961-1970, in January, cases of soft rime deposits of the DP category were quite common in Ukraine and were observed in 15 regions. The greatest spread of such deposits was observed in January 1964. Subsequently, the area of their distribution was reduced to several areas, of which they were most often observed in Transcarpathia in the Autonomous Republic of Crimea. Such deposits were quite common in December 1961-1970 and 1981-1990, when they were observed in 5-6 regions.