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垂直速度对水汽垂直湍流通量交叉耦合效应的实验验证

, PP. 490-498

Keywords: 大气近地面层,湍流输送,潜热通量,垂直速度,交叉耦合

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Abstract:

?大气线性热力学理论证明潜热通量由水汽垂直梯度输送通量和垂直速度耦合输送通量两部分组成,本文利用大气边界层观测实验资料验证了垂直速度对潜热通量的耦合效应.结果表明,存在一个耦合零效应高度,当观测高度高于耦合零效应高度时,耦合效应削弱潜热通量;当观测高度低于耦合零效应高度时,耦合效应增强潜热通量;在实验区域非均匀下垫面上,考虑耦合效应后,在上升气流条件下潜热通量估算值和观测值间的系统性偏差从27%减小到2%;在下沉气流条件下两者的系统性偏差从47%减小到28%;大气湍流交叉耦合理论得到了证实.结果也为大气湍流交叉耦合理论的应用提供了实验基础.

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