Abstract
On the basis of the analysis of the data on the recurrence of days with fogs during 1970-2018, modern spatiotemporal features of this phenomenon in Chernihiv region are revealed. According to the constructed cards it is revealed that the average long-term number of days with fogs within the region depends, first of all, on the topography, as well as vegetation, temperature distribution and humidity. Graphs of long-term smoothed fog recurrence at seven weather station show that, despite significant differences in absolute values, the identified trends are similar. On the basis of trend analysis and long-term smoothed course it is shown that the recurrence of days with fog during the studied period in all seasons decreases (most noticeably in spring), apparently, due to complex interaction of atmospheric circulation (change of influence of baric centers), significant change of thermal surface of air and undergrowth, content of aerosols of natural and anthropogenic origin. By analyzing the average seasonal indicators, the peculiarities of the distribution of the number of days with fog in each calendar season of the year were revealed. On the basis of comparative analysis of the distribution of indicators averages over three 16-years periods, it is shown that major changes (decrease in the recurrence of fog) occurs in the north of the region, which lead to a decrease in the intra-region contrasts of this phenomenon. Long-term data show that for all periods the highest recurrence of fog (mainly advective) in the winter and autumn season is characteristic, when the Icelandic minimum is decisive; in the spring and summer, when the influence of the Azores maximum is the main one, fogs are infrequent (mainly radiation). It is shown that in the whole territory of the region the frequency of fog of high intensity is insignificant; in the long run, low intensity fogs have less variability than moderate intensity fog with the highest proportion.
Published Version
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