Abstract
The gas transfer of CO2 at the air-water interface when regular surface waves run up a sloping flat bed is investigated experimentally. The CO2absorption process is visualized by using a laser-induced fluorescence te chnique (LIF). We found out in the vicinity of the air-water interface, or ganized vortices whose rotation direction is opposite to that of the offshore vortex train, which was reported by Matsunaga et al. The counter-rotating vortices are found to promote efficiently the gas transfer at the wavy air-water interface in the offshore zone. The local gas transfer velocity is obtained from an image processing for LIF images. It is quantitatively confirmed that the transfer velocity increases due to the organized vortices.
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