005. Факультет природничих наук
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Browsing 005. Факультет природничих наук by Author "Boychenko, Svitlana"
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Item Assessing the influence of height above sea level and geographic coordinates on surface air temperature values for a plain part of Ukraine(2022) Boychenko, Svitlana; Maidanovych, N.; Zabarna, O.The main principles of the methodology for assessing the influence of height above sea level and geographic coordinates (latitude and longitude) on the values of annual and average monthly temperature in Ukraine for the period 1991-2020 are proposed. Thus, the annual surface air temperature decreases by an average: of 0.69oС per 100 m of height above sea level, of 0.51oС with a shift of one degree of latitude to the north, and of 0.08oС with a shift of one degree of longitude to the East. The altitudinal and latitudinal gradients of temperature have the greatest spatiotemporal variability and the longitudinal gradient has the smallest one. These gradients generate "microclimatic noise" of temperature. On their basis, a regional semi-empirical model of the spatiotemporal distribution of the average monthly temperature for the plain part of Ukraine for the period 1991-2020 was worked out. A comparison of values of model average annual and monthly temperature for 58 meteostations in Ukraine with their actual values showed a statistically significant correlation. Additionally, validation of semi-empirical model average monthly temperature for 10 other stations was carried out.Item Assessment of aridization of climatic conditions on the Crimean Peninsula in summer using ground and satellite data(2022) Boychenko, Svitlana; Kuchma, TetianaClimate vulnerability of the Crimean Peninsula is assessed based on the temperature and precipitation changes for the period 1991-2021 and satellite-derived drought index (VHI) variations for the period 2001-2021. There is an increase of temperature on average by 0.78±0.01 oC per 10 years in summer, and a slight change in precipitation in June and July (within 2±1%). While in August there is a decrease of the precipitation amount by 10-12%. According to analysed data, the most severe drought condition manifestation on the Crimean Peninsula over the last twenty years was observed in 2007, 2017, 2018 and 2020. In the central part of the Crimean peninsula, which belongs to the climatic zone of Steppe Crimea, arid conditions had the greatest manifestation and distribution (zones with extreme and severe drought conditions are observed). Minor areas in the mountainous part of the Crimea also have signs of arid conditions, but for the most part the condition of vegetation is satisfactory in this area. In percentage terms, in 2007 VHI values of extreme and severe drought occupied 57% and 20% of the peninsula’s area accordingly, as well 10% and 29% in 2017, 7% and 22% in 2018 and 11% and 26% in 2020.Item Change in the Water Surface Area of Reservoir of the Crimean Peninsula According to Radar Satellite data Sentinel-1 for the Period from October 2014 to August 2022(2022) Kuchma, Tetyana; Boychenko, SvitlanaAccording to Sentinel–1 radar satellite data, there is a tendency to reduce the area of the water mirror in all reservoirs of the Crimean Peninsula, analyzed in this study, compared to their water surface area in 2015. On average, the area of the water mirror decreased by 34% in 2021. In three reservoirs, the area of the water mirror decreased by more than 60% compared to 2015: Frontove, Taiganske, and Mizhhirske reservoirs. The tendency to reduce the water surface area begins to manifest clearly in mid–2019 and continues until 2021. Also, a retrospective analysis of satellite images for 2015–2021 showed that the Simferopol reservoir of water surface area had been reduced on average by ~ 20% compared to 2015. Changes in the Water Surface Area of Simferopol and Feodosiya Reservoir for the Period from October 2014 to August 2022 were presented. A retrospective analysis of satellite images for the period from March 2015 to August 2022 showed that the Simferopol and Feodosiya Reservoirs of water surface area had been reduced on average by ~20% and ~30% (according) compared to 2015.Item Climate impact drivers provoke fires in protected areas of Polissia(2022) Karamushka, Victor; Boychenko, Svitlana; Nazarova, OlhaThe purpose of the research was to analyze the dynamic of the climate impact drivers (CIDs) in the Regional Landscape Park Mizhrichynskyi (RLPM), Chernihiv Region, and to determine changes occurred in the protected areas affected by CIDs using the satellite monitoring data. It is shown that in the region for the period 1991-2021, such CIDs as the average annual surface temperature have a tendency to increase (the rate is 0.68оС per 10 years, average annual value is 8.4±0.9оС), while atmospheric precipitation tends to decrease by 5-7% per 10 years (-24 mm per 10 years, an average annual value is 581±94 mm). During periods with minimal precipitation and high temperatures, conditions favorable for the development of fires arise. Such conditions were observed in 2020. As a result of the fire in the RLPM (April 2020), more than 650 hectares of forest ecosystems were affected. Using the satellite monitoring data, the area of the territory covered by the fire was determined, and using the Normalized Difference Vegetation Index as an indicator, the development of successional processes in this territory was recorded. Field studies confirm the occurrence of pioneer species in the fires. The list of these species includes but not restricted to Viola tricolor, Pinus sylvestris, Salix rosmarinifolia, Corynephorus canescens, Oenothera biennis L., Hieracium pilosella L.