Abstract
Utilizing the similarity in pH of oceans and the greatest lake in Hungary (Lake Balaton) and the fact, that exchange of ammonia between atmosphere and aquatic systems strongly depends on the acidity-alkalinity of the water, we examined the flux of HN3 on the basis of an exchange model. Results of field measurements were used to validate the model. Physical and chemical parameters needed as input parameters were continuously monitored at the lake. Results show, that ammonia flux within lake and atmosphere is bi-directional. As N-input to the lake is increasing the compensation point is parallel increasing as well, resulting in ammonia emission and vice-versa. It seems that NH3 plays a buffering role in the N-budget of the lake. Bi-directional operates between the pH range of 7–11, where dissolved ammonium and ammonia are available together in equilibrium. Model was applied for Baltic Sea in cooperation with Gdansk University, Institute of Oceanography. Expert of HMS joined the COST 735 activity, titled “Tools for Assessing Global Air-Sea Fluxes of Climate and Air Pollution Relevant Gases”.
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