The study aims to monitor the emissions and uptake of carbon dioxide and water vapour at a specialized carbon polygon near the city of Gelendzhik, Krasnodar Krai. The paper analyses CO₂ and H₂O fluxes along with atmospheric parameters recorded from December 2024 to May 2025 using data from an automatic LI-COR Environmental monitoring station installed 25 m from the shoreline. Gas fluxes were calculated using the eddy covariance method at a frequency of 10 Hz. The main components of the station are atmospheric heat flux sensors, including a photosynthetically active radiation sensor; an ultrasonic anemometer; a gas analyzer; an air temperature and humidity sensor; soil temperature, heat flux and moisture content sensors; and a precipitation gauge. Daytime and nighttime partitioning of the net CO₂ flux into gross primary production and ecosystem respiration was applied. The results of the experiment showed that about 500 g of carbon dioxide per square meter was emitted into the atmosphere from the study area during the specified period. Ecosystem respiration accounted for 1300 g, whereas gross primary production accounted for 800 g. Seasonal dynamics of the exchange were identified: during winter months and in early calendar spring, CO₂ emission into the atmosphere prevails, while from April onward its uptake by the ecosystem is observed. The average CO₂ concentration in the air during the observation period was 423.2 ± 5.2 μmol/mol (with a global average of 420 μmol/mol). Despite the challenging conditions of the station's location in the coastal zone, the obtained results are physically sound and can be used to estimate greenhouse gas fluxes.
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