详细
Pioneer results of high-precision direct determination of CO2 in the surface waters of the Black Sea have been presented in this paper. This data has made possible high precision characteristics of the content and intra-annual variations of CO2. The average annual value of pCO2 is 436 µatm, which is higher than the average annual value of the near sea surface atmosphere (420 µatm). The analysis of seasonal variability has revealed about 30% decrease in sea water pCO2 from late spring to autumn. The minimum values of pCO2 are detected in January – February, the maximum ones in July. Seasonal variations in the CO2 content in the near sea surface atmosphere have revealed an inverse relationship – with maximum values in February and minimum values in July. This indicates different mechanisms of the CO2 evolution in the air and seawater. Seasonal variations in the intensity of burning organic carbon, as external sources, influence the content of CO2 in the atmosphere. Variations in temperature and the state of the carbonate system, as abiotic factors, govern pCO2 in water. In the summer-to-autumn period, pCO2 is governed by a combination of abiotic and biotic factors – variations in temperature and intensity of production and transformation of organic matter. The ratio of abiotic to biotic factors varies from season to season, but abiotic factors remain primary throughout the year.