This is particularly important for the low to moderate wind-speed regime, when spray and bubbles have less dominance on the efficiency of the transfer. The water-side convection, as well as other processes influences the transfer velocity, influences gases of different solubility differently.
Data used in the study are based on measurements with the Eddy-Covariance technique (EC) taken at the Östergarnsholm site in the Baltic Sea as well as at a Swedish lake site (lake Tämnaren). The accuracy of EC data in relation to other methods of determining fluxes will be discussed. Instrumental uncertainty for transfer velocity for carbon dioxide using the EC method is estimated to approximately 20% (Rutgersson et al, 2008); in addition there are methodological problems as well as representativity of the data.
Using a modeling framework developed for the predictive analysis of the functioning and dynamics of the Baltic Sea organic/inorganic carbon and oxygen systems we analyzed the sensitivity of transfer velocity on the carbon cycle in the model. Significant components of the Baltic Sea carbon and oxygen systems relates to the uptake/release to the atmosphere. Improving the description of the air-sea transfer velocity changes the distribution of the air-sea exchange in time and space.