Monin-Obukhov Similarity Theory for Carbon Dioxide, Water Vapor and Vertical Wind Velocity

Nozomi Ushikawa, Toru Iwata, Takeshi Miura, Eiji Ohtaki, Akinori Ohtou, Yoshihisa Higuchi

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1 Citation (Scopus)


The Monin-Obukhov similarity theory for carbon dioxide (c) and water vapor (q) is investigated using data obtained over a rice field. First, the similarity theory is applied to the standard deviations of c and q. It is noticed that the standard deviations normalized by their friction concentrations show very similar stability dependence: σc/|c| = 3.0(1-7.0ζ)-1/3 and σq/|q| = 2.9(1-7.0ζ)-1/3 under unstable conditions, and σc/|c| = 3.0(1 +7.0ζ)1/3 and σq/|q| = 2.9(1 +7.0ζ)1/3 under stable conditions. This results in the situation that the correlation coefficient between c and q can be expressed as the ratio of 2.9/3.0≈ 1, where numerals of 3.0 and 2.9 are the value of the normalized standard deviation of c and q under neutral conditions.

Original languageEnglish
Pages (from-to)209-214
Number of pages6
JournalJournal of Agricultural Meteorology
Issue number3
Publication statusPublished - 2004
Externally publishedYes


  • Atmospheric surface layer
  • Carbon dioxide
  • Monin-Obukhov similarity theory
  • Water vapor

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Atmospheric Science


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