An Approach to Minimizing Artifacts Caused by Cross-Sensitivity in the Determination of Air-Sea CO2 Flux Using the Eddy-Covariance Technique

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) The air-sea ... flux was measured from a research vessel in the North Yellow Sea in October 2007 using an open-path eddy-covariance technique. In 11 out of 64 samples, the normalized spectra of scalars (..., water vapour, and temperature) showed similarities. However, in the remaining samples, the normalized ... spectra were observed to be greater than those of water vapour and temperature at low frequencies. In this paper, the noise due to cross-sensitivity was identified through a combination of intercomparisons among the normalized spectra of three scalars and additional analyses. Upon examination, the cross-sensitivity noise appeared to be mainly present at frequencies ... Our analysis also suggested that the high-frequency fluctuations of ... concentration (frequency ...) was probably less affected by the cross-sensitivity. To circumvent the cross-sensitivity issue, the cospectrum in the high-frequency range 0.8-1.5 Hz, instead of the whole range, was used to estimate the ... flux by taking the contribution of the high frequency to the ... flux to be the same as the contribution to the water vapour flux. The estimated air-sea ... flux in the North Yellow Sea was ... a value comparable to the estimates using the inertial dissipation method and Edson's method (Edson et al., J Geophys Res 116:C00F10, 2011 ).[PUBLICATION ABSTRACT]