AM06-10-010 大気-海洋間におけるCO_2交換速度の砕波パラメータ依存性(波浪・砕波・水表面での気体輸送(2),一般講演)

概要

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The influence of wave-field conditions on the air-sea transfer velocity of CO_2 is investigated on the basis of field measurements. The present data show that the transfer velocity is relatively suppressed by the presence of swell and the velocity for windsea increases with the wave age under the same air friction velocity. Also, we examine how a nondimensional transfer velocity k_L/u_* depends on breaking-wave parameters R_B and R_H, which are defined by u_*^2/v_aω_p and u_*H_s/v_a respectively, where u_* is the air friction velocity, v_a the kinematic viscosity of air, ω_p the angular frequency of windsea and H_s the significant wave height. In focusing on the windsea-dominant data, the nondimensional transfer velocity plotted against R_H is found to reduce remarkably the wave age dependence, compared with that plotted against R_B. This suggests that the significant wave height becomes a representative turbulent lengthscale associated with breaking waves.
2006-09-05