Effects of rainfall on mass transfer across the air‐water interface
Effects of rainfall on mass transfer across the air‐water interface
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DOI：
10.1029/2006jc003752
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发表时间：
2007-06
影响因子：
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通讯作者：
N. Takagaki;S. Komori
中科院分区：
文献类型：
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作者：
N. Takagaki;S. Komori
[1]通过室内试验研究了降雨对明渠湍流气水界面传质和湍流结构的影响。在明渠水流中测量了雨滴撞击气-水界面时的CO2传递系数和湍流度。结果表明，降雨增强了近液面处的湍流混合，导致气-水界面上CO2输送量增加。在液体侧的传质系数是很好的相关性与降雨的平均垂直动量通量（MF），但它不是很好的相关性雨滴撞击在气-水界面的单位面积上的平均动能通量（KEF），在以前的研究中已经提出。在目前的降雨实验中获得的最大值的传质系数对应于在高风速的海洋中观察到的。这表明，在精确估算当地海气CO2交换率时，考虑降雨的影响是非常重要的。
[1] The effects of rainfall on mass transfer across the air-water interface and turbulent structure were investigated through laboratory experiments in a turbulent open-channel flow. The air-water CO2 transfer coefficient due to raindrops impinging on the air-water surface and turbulence quantities in an open-channel flow were measured. The results show that rainfall enhances turbulent mixing near the free surface on the liquid side, and the enhancement results in increase of CO2 transfer across the air-water interface. The mass transfer coefficient on the liquid side is well correlated with the mean vertical momentum flux of rainfall (MF), but it is not well correlated with the mean kinetic energy flux of raindrops impinging on the unit area of the air-water interface (KEF), as has been proposed in previous studies. The maximum value of the mass transfer coefficient obtained in the present rain experiments corresponds to that observed in oceans with high wind speeds. This suggests that it is of great importance to consider the effects of rainfall in precisely estimating the local air-sea CO2 exchange rate.