Кафедра екології
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Item type:Наукова стаття, Shallowing of the Svityaz Lake in the context of regional climate change(2020-12-29) Fedoniuk, Vitalina; Khrystetska, Maria; Fedoniuk, Mykola; Merlenko, Ihor; Bondarchuk, SerhiyУThe paper analyzes the dynamics of the main climatic indicators in order to reveal the role of regional and local factors in the current changes in the water content of the Svitiaz Lake (NW Ukraine). The current state of study of the water balance of the lake and the factors that form it are estimated. The main trends for changes in the levels and regime of surface water, groundwater and artesian water in the territory of the Shatsk National Nature Park are identified. Quantitative data characterizing long-term and modern changes in water levels in the lake are presented. Shallowing of 2019 is characterized (the lowest water level over the last 50 years, reduction of the water mirror area by 8%). Based on statistical mathematical and cartographic analysis of climatic data provided by 17 meteorological stations in the region the dynamics of average annual, monthly and seasonal precipitation, evaporation and their spatial distribution were estimated. A significant increase in evaporation during the warm period of the year over the last decades (2000-2018) has been revealed. Changesin the amount and mode of precipitation over 2 long-term periods are estimated. The peculiarities of the dynamics of the main meteorological indicators in 2019 (average monthly and average annual air temperatures, relative humidity, precipitation amounts) were separately analyzed. Values of humidity coefficients and hydrothermal coefficients were calculated. The parts of the region with the lowest values of these indicators, including the catchment area of Lake Svityaz, are outlined and visualized on the map. The significant role of evaporation growth was confirmed given the consistent increase in air temperatures over the last 20 years. Given the Svityaz station data it is also calculated the correlation coefficients of water levels in the lake with the same indicators for the period since 1970. During the period of 2000-2018, a significant increase in the dependence of water levels on the hydrothermal coefficient of Selyaninov was established, which may indicate a decrease in the ecological stability of the lake and its increasing vulnerability to climate change.Item type:Наукова стаття, Spatial analysis of wildfire occurrence in the Emerald Network sites of Volyn and Zhytomyr Polissia (2012-2024)(2025) Fedoniuk, Mykola; Kovalchuk, Ivan; Fesyuk, Vasyl; Fedoniuk, Vitalina; Zhadko, OksanaThe paper analyzes the spatial and temporal distribution of wildfires over a 13-year period in 36 sites of the Emerald Network located within the Ukrainian Polissia region. Materials of remotely sensed data from MODIS satellites provided by the European Forest Fire Information System (EFFIS) were used. The number of hotspots in each of the Emerald Network sites was calculated, and the density of fires was determined both in individual sites and for the entire territory. The temporal distribution of wildfires occurrence was analyzed, and the years and seasons of the maximum and minimum number of fires were identified. The area of burned land was estimated. The Emerald Network sites were ranked according to the obtained quantitative indicators. The locations and types of ecosystems most and least affected by fires were identified. It was established that most of the studied Emerald Network sites are characterized by a lower frequency of wildfires occurrence compared to the average values for the region.Item type:Наукова стаття, Monitoring of climate changes and the state of natural complexes of the Cheremsky Nature Reserve(2023) Fedoniuk, Vitalina; Zhadko, Оksana; Vovk, Оleksandr; Fedoniuk, Mykola; Ivantsiv, VasulIn recent decades, global climate changes have resulted in a range of regional climatic processes and phenomena, exerting significant impacts on the natural complexes within nature conservation areas, protected objects, and elements of the ecological network. The study of these effects is highly pertinent to the territories and natural systems encompassed by the Cheremsky Nature Reserve, a particularly valuable nature conservation complex in Northwestern Polissya. Our analysis was based on meteorological data from the nearest weather station, complemented by remote sensing techniques examining vegetation and water indices over the 5-year period. This examination revealed several notable deviations from climatic norms, including: an increase in annual and maximum air temperatures by 2.0°C and minimum temperatures by 1.0-1.5°C, an increase in annual precipitation by 5-6%, a drastic reduction in snow cover duration by 2-2.5 times, a decrease in the number of days with precipitation by 10-17%, a substantial increase in the number of days with thunderstorms. These findings suggest a negative impact on natural complexes, primarily due to an increase in evaporation from the active surface and a corresponding decrease in the humidity coefficient by 20-25%. Additionally, our study revealed the interrelation between vegetation processes and the dynamics of climatic indicators.Item type:Наукова стаття, Temperature Regime and Ice Cover Dynamics in the Coastal Regions of the Antarctic Peninsula(2022-10-05) Fedoniuk, Vitalina; Luhinina, Julia; Fedoniuk, Mykola; Ivantsiv, Vasyl; Bondarchuk, SerhijClimate change affects all regions around the world, but the ice covered areas are particularly vulnerable in this case. The Antarctic ice sheet is the largest single mass of ice on Earth. Melting of ice sheets is dangerous, as it can lead to flooding of low-lying coastal areas and other negative processes. In this study, we use remote sensing methods to analyze the changes in air temperature and its impact on the condition of the ice sheets in the coastal regions of the Antarctic Peninsula. Analysis of space images of the Antarctic Peninsula coast for the period 1985–2020 showed that the ice covered area shrinked, as a result, the length of the coastline expanded, and it became more winding. The length of the coastline has increased by 20–25%. Temperature analysis of the investigated area during 1985–2020 (according to the data provided by the Ukrainian Antarctic Akademik Vernadsky station) showed clearly that the average, maximum, and minimum air temperatures have been trending upwards. The average annual air temperature and the average minimum air temperature increased by 1–1.5 0C, the average maximum air temperature during this period increased by 3.30C. This is a sign that global climate change is also impacting the southernmost regions of Earth.Item type:Наукова стаття, Differences in the assessment of vegetation indexes in the EO-Browser and EOS landviewer services (on the example of Lutsk district lands)(2021-05-14) Fedoniuk, Mykola; Kovalchuk, Ivan; Fesyuk, Vasyl; Kirchuk, Ruslan; Merlenko, Igor; Bondarchuk, SerhiiThe paper considers the differences in the display of vegetation indices in the services EO-Browser and EOS LandViewer for selected key areas in the Lutsk district (Volyn Upland, NW Ukraine). A sample of satellite images with different cloud filters was evaluated for the period 2019-2020. The number of images acceptable for analysis in different months of the year is determined. The difference between the maximum, minimum and average NDVI values, which are calculated by both services, is determined. In most cases, smaller values are typical for calculated indexes by EOS LandViewer. Despite the significant difference in individual unit values (up to 30-50%), the averaged deviations were predominantly less than 10%. For plains with flat terrain, the difference between NDVI values for both services is much smaller than for areas with complex topography. The combined use of both services will create the most effective analysis of vegetation indexes. Effective analysis is possible by using the features identified in this study.