Abstract
The spectral density technique is investigated as a basis for measuring turbulent fluxes of CO2 and 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:
φ c = φ q = (1 − 16z/L)−1/2; α c = 0.78 and α q = 0.76
Here, subscripts c and q refer to CO2 and water vapour; z is height and L is 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.
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Iwata, T., Yoshikawa, K., Higuchi, Y. et al. The Spectral Density Technique for the Determination of CO2 Flux Over the Ocean. Boundary-Layer Meteorol 117, 511–523 (2005). https://doi.org/10.1007/s10546-005-2773-4
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DOI: https://doi.org/10.1007/s10546-005-2773-4