The spectral density technique for the determination of CO2 flux over the ocean

Toru Iwata, K. Yoshikawa, Y. Higuchi, T. Yamashita, S. Kato, E. Ohtaki

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 (α) 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 = 0.76 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.

Original languageEnglish
Pages (from-to)511-523
Number of pages13
JournalBoundary-Layer Meteorology
Volume117
Issue number3
DOIs
Publication statusPublished - Dec 2005

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ocean
water vapor
eddy
anemometer
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sensor
parameter
sea
measuring

Keywords

  • Air-sea interaction
  • COflux
  • Eddy correlation technique
  • Spectral density technique
  • Water vapour flux

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

The spectral density technique for the determination of CO2 flux over the ocean. / Iwata, Toru; Yoshikawa, K.; Higuchi, Y.; Yamashita, T.; Kato, S.; Ohtaki, E.

In: Boundary-Layer Meteorology, Vol. 117, No. 3, 12.2005, p. 511-523.

Research output: Contribution to journalArticle

Iwata, T, Yoshikawa, K, Higuchi, Y, Yamashita, T, Kato, S & Ohtaki, E 2005, 'The spectral density technique for the determination of CO2 flux over the ocean', Boundary-Layer Meteorology, vol. 117, no. 3, pp. 511-523. https://doi.org/10.1007/s10546-005-2773-4
Iwata, Toru ; Yoshikawa, K. ; Higuchi, Y. ; Yamashita, T. ; Kato, S. ; Ohtaki, E. / The spectral density technique for the determination of CO2 flux over the ocean. In: Boundary-Layer Meteorology. 2005 ; Vol. 117, No. 3. pp. 511-523.
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AU - Kato, S.

AU - Ohtaki, E.

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