No abstract

The study deals with the nature of dry events and periods with consecutive dry days of different duration in the region of Bukovinian Precarpathians on the example of the Chernivtsi city. The archives of meteorological daily data in Chernivtsi in the periods on the turns of centuries (1880-1911 and 2000-2011) are involved. Climatological statistical analysis of humidification and precipitation regimes and peculiarities of dry periods (with days without effective precipitation) in Chernivtsi are provided. Here, we considered the precipitation in the amount of 5 mm per day (if precipitation lasts for 1-5 days) the minimum amount of precipitation that “breaks” the consecutive dry days. The results prove the typical nature of the periods in the region of Bukovinian Precarpathians, both at the turn of the 19th and 21th centuries. Dry periods with duration of 21-30 days make up 70-80% of the probability of occurrence in both periods. Moreover, in the period of 1880-1911, dry periods twice longer were found in comparison to the beginning of the 21st century. The longest period without effective precipitation continued for as long as 165 days (1881-1882) though the probability of occurrence of periods with the duration of 10-20 days made up 96.6% in 1880-1911.The study has not revealed clear trends in the distribution of dry periods in any of the duration type. Instead, seasonal peculiarities and changes in the duration periods are found. In both cases, a gradual decrease in dryness from April to June is detected, although the presence of dry periods in all seasons of the year is characteristic only for the 1880-1911 period. At the beginning of the 21st century an increase in the dryness of April and the entire winter period is noticed. Consequently, the autumn dry period that is characteristic of Western Ukraine gradually shifts to winter and spring. Discovered features may serve the basis for making geographical forecasts regarding the occurrence, duration, and impacts of dry periods in the region.