статья в журнале

En

Doklady Earth Sciences

ISSN:1028334X

2024

10.1134/S1028334X24602943

Abstract: The results of high-precision direct determination of CO2 in the surface waters of the Black Sea are presented. These measurements made possible to obtain high precision characteristics of the content and intra-annual variations in pCO2 for the first time. The average annual value of pCO2 is 436 µatm, which is higher than the average annual value in the near-sea surface layer of the atmosphere (420 µatm). The seasonal variability has revealed decrease of pCO2 in seawater from late spring to fall. The minimum values of pCO2 are detected in January–February; the maximum ones, in July. The seasonal variations in the CO2 content in the near-sea atmosphere reveal an inverse relationship, with maximum values in February and minimum values in July. This indicates different mechanisms of the evolution of CO2 in the air and seawater. The content of CO2 in the atmosphere is determined by external sources and depends on the burning intensity of organic carbon. Variations in pCO2 in water is significantly affected by abiotic factors, such as the influence of temperature change on CO2 solubility and the state of the carbon system. In the summer–fall season, pCO2 is determined by a combination of abiotic and biotic factors, including variations in temperature and intensity of biological processes of organic matter transformation. Both the intensity and effect of these factors vary throughout the year, but the abiotic factor remains primay during the entire year.

Black Sea, carbon dioxide, carbonate system, CO2

2024-08-24 11:02:11