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首页> 外文会议>International Conference on Regional Carbon Budgets; 20060816-18; Beijing(CN) >Sensor tilt and density effects correction for turbulent fluxes over heterogeneous terrain
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Sensor tilt and density effects correction for turbulent fluxes over heterogeneous terrain

机译：传感器倾斜和密度效应校正，用于非均匀地形上的湍流

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Eddy covariance and radiation measurements were made for about 5 weeks at a heterogeneous farmland in South China. This study aims to investigate the sensitivity of turbulent fluxes to the coordinate rotation and the significance of the Webb's correction. First, two rotation methods are adopted, namely the natural wind coordinate (NWC) and planar fit coordinate (PFC). Linear regressions show that sensible and latent fluxes appear insensitive to the choice of coordinate. But CO_2 fluxes (absolute value) with PFC are less than those with NWC by almost 20%. Furthermore, the mean vertical velocity deduced by the Webb's correction is commonly less than 1 mm s~(-1), which has a negligible effect on latent fluxes. However, its impact on CO_2 fluxes is significant, as CO_2 exchange is reduced by more than 20%. During the daytime, the effect of the Webb's correction is less than 3% on latent fluxes, while it approaches -50% on CO_2 fluxes.
机译：在中国南方的一个异质农田中进行了约5周的涡度协方差和辐射测量。这项研究旨在调查湍流对坐标旋转的敏感性以及韦伯校正的意义。首先，采用两种旋转方法，即自然风坐标（NWC）和平面拟合坐标（PFC）。线性回归表明，合理的和潜在的通量似乎对坐标的选择不敏感。但是PFC的CO_2通量（绝对值）比NWC少近20％。此外，通过韦伯校正推导出的平均垂直速度通常小于1 mm s〜（-1），这对潜通量的影响可以忽略不计。但是，它对CO_2通量的影响很大，因为CO_2交换减少了20％以上。在白天，韦伯校正对潜通量的影响小于3％，而对CO_2通量的影响接近-50％。

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