ИСТИНА

Fluxes of GH gases across the water surface constitute an important part of the global climate. Because of the combination of small concentrations and small fluxes, the determination of air–water gas fluxes presents unusual measurement difficulties. Direct measurements (ie, eddy correlation) of the fluxes are rarely attempted. Used in gas transport parameterization models were mainly developed for the open ocean. The differences, especially those between shallow sheltered systems and the open waters best fit by some published relationships, are ecologically important and do not appear yet to be measurable by other methods. The report discusses the determination of the transfer coefficient from direct measurements of methane and carbon dioxide fluxes in the case of shallow water bodies. Coastal zones, an estuary, a small lake and a river of differing bathymetry and local terrain are considered.