The Spectral Density Technique for the Determination of CO2 Flux Over the Ocean
The Spectral Density Technique for the Determination of CO2 Flux Over the Ocean
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DOI：
10.1007/s10546-005-2773-4
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发表时间：
2005-12
影响因子：
4.3
通讯作者：
T. Iwata;K. Yoshikawa;Y. Higuchi;T. Yamashita;S. Kato;E. Ohtaki
中科院分区：
文献类型：
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作者：
T. Iwata;K. Yoshikawa;Y. Higuchi;T. Yamashita;S. Kato;E. Ohtaki
利用2000年9月20-22日在京都大学设计良好的码头上进行的观测资料，研究了谱密度技术作为测量海洋上空CO2和水汽湍流通量的基础。通过比较谱密度法和涡动相关法测量的湍流通量，确定了无量纲梯度（φ）和Kolmogorov常数（α）的参数。以下参数是谱密度技术在不稳定条件下的最佳选择：φc= φq=（1 − 16 z/L）−1/2; αc= 0.78和αq= 0.76这里，下标scandq是指CO2和水蒸气; z是高度，L是奥布霍夫稳定长度。目前的结果表明，坚固的声波风速计，温度计传感器和计算机，频谱密度技术应用于海上的准确性相媲美的涡动相关技术。
The spectral density technique is investigated as a basis for measuring turbulent fluxes of CO2and water vapour over the sea using observations obtained on a well-designed pier of Kyoto University during September 20–22, 2000. By comparing the turbulent fluxes measured by the spectral density technique with those determined by the eddy correlation technique, a set of parameters of the non-dimensional gradient (φ) and Kolmogorov constant (a) was determined. The following parameters are the optimal selection under unstable conditions for the spectral density technique:φc= φq= (1 − 16z/L)−1/2; αc= 0.78 and αq= 0.76Here, subscriptscandqrefer to CO2and water vapour;zis height andLis the Obukhov stability length. The present results demonstrate that with rugged sonic anemometer-thermometer sensors and computers, the spectral density technique applied over the sea has an accuracy comparable to that of the eddy correlation technique.