大気-海洋間における二酸化炭素フラックスの評価法に関する研究(波浪・砕波・水表面での気体輸送(1),一般講演)

概要

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Turbulent fluxes of momentum, sensible heat, latent heat and CO_2 were measured at a sea observation tower by means of the eddy correlation method. Environmental factors controlling the air-sea flux of CO_2 were investigated on the basis of the measurements. On the ocean surface, the change in the air density becomes so relatively large that corrections concerning sensible and latent heat fluxes, i.e., the Webb corrections, should be made for evaluating the flux of CO_2. The present data show the corrections are very important to estimate accurately the total CO_2 flux across the air-sea interface. Based on directional wave spectra, we classified swell conditions into three groups, i.e., Pure windsea, Swell-dominated sea and Cross swell. The transfer velocity of CO_2 for Pure windsea increases monotonously with the wind speed, while the presence of swell contaminates the wind-speed dependence of the transfer velocity.
2007-08-06