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Air-sea CO2 flux by eddy covariance technique in the equatorial Indian Ocean

机译：赤道印度洋涡协方差技术观测的气海CO2通量。

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Direct measurements of the air-sea CO2 flux by the eddy covariance technique were carried out in the equatorial Indian Ocean. The turbulent flux observation system was installed at the top of the foremast of the R/V MIRAI, thus minimizing dynamical and thermal effects of the ship body. During the turbulent flux runs around the two stations, the vessel was steered into the wind at constant speed. The power spectra of the temperature or water vapor density fluctuations followed the Kolmogorov ?5/3 power law, although that of the CO2 density fluctuation showed white noise in the high frequency range. However, the cospectrum of the vertical wind velocity and CO2 density was well matched with those of the vertical velocity and temperature or water vapor density in this frequency range, and the CO2 white noise did not influence the CO2 flux. The raw CO2 fluxes due to the turbulent transport showed a sink from the air to the ocean, and had almost the same value as the source CO2 fluxes due to the mean vertical flow, corrected by the sensible and latent heat fluxes (called the Webb correction). The total CO2 fluxes including the Webb correction terms showed a source from the ocean to the air, and were larger than the bulk CO2 fluxes estimated using the gas transfer velocity by mass balance techniques.
机译：在赤道印度洋，通过涡度协方差技术直接测量了气海CO2通量。湍流通量观测系统安装在R / V MIRAI的前部顶部，从而最大程度地减小了船体的动力和热效应。在湍流绕过两个测站的过程中，船舶以恒定速度转向风中。温度或水蒸气密度波动的功率谱遵循Kolmogorov？5/3功率定律，尽管CO2密度波动的功率谱在高频范围内显示白噪声。但是，在此频率范围内，垂直风速和CO2密度的共谱与垂直风速和温度或水蒸气密度的共谱非常匹配，并且CO2白噪声不影响CO2通量。由于湍流传输而产生的原始CO2通量显示出从空气到海洋的下沉，并且由于平均垂直流而具有与源CO2通量几乎相同的值，并通过显热和潜热通量进行了校正（称为韦伯校正） ）。包括韦伯校正项在内的总CO2通量显示出了从海洋到空气的来源，并且大于通过质量平衡技术使用气体传输速度估算的总CO2通量。

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