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Volume 30 Issue 2

Mar.  2013

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2013 >  30(2): 411-424

Estimation of Turbulent Fluxes Using the Flux-Variance Method over an Alpine Meadow Surface in the Eastern Tibetan Plateau

  • 1.

    Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering, Washington State University, Pullman, WA;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000


doi: 10.1007/s00376-012-2056-1

  • The flux-variance similarity relation and the vertical transfer of scalars exhibit dissimilarity over different types of surfaces, resulting in different parameterization approaches of relative transport efficiency among scalars to estimate turbulent fluxes using the flux-variance method. We investigated these issues using eddy-covariance measurements over an open, homogeneous and flat grassland in the eastern Tibetan Plateau in summer under intermediate hydrological conditions during rainy season. In unstable conditions, the temperature, water vapor, and CO2 followed the flux-variance similarity relation, but did not show in precisely the same way due to different roles (active or passive) of these scalars. Similarity constants of temperature, water vapor and CO2 were found to be 1.12,1.19 and 1.17, respectively. Heat transportation was more efficient than water vapor and CO2. Based on the estimated sensible heat flux, five parameterization methods of relative transport efficiency of heat to water vapor and CO2 were examined to estimate latent heat and CO2 fluxes. The strategy of local determination of flux-variance similarity relation is recommended for the estimation of latent heat and CO2 fluxes. This approach is better for representing the averaged relative transport efficiency, and technically easier to apply, compared to other more complex ones.
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    • Manuscript History

    Manuscript received: 10 March 2013
    Manuscript revised: 10 March 2013
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    Estimation of Turbulent Fluxes Using the Flux-Variance Method over an Alpine Meadow Surface in the Eastern Tibetan Plateau

    • 1. Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering, Washington State University, Pullman, WA;Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions, Cold and Arid Regions, Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000
    • Manuscript received: 2013-03-10
    • Manuscript revised: 2013-03-10

    Abstract: The flux-variance similarity relation and the vertical transfer of scalars exhibit dissimilarity over different types of surfaces, resulting in different parameterization approaches of relative transport efficiency among scalars to estimate turbulent fluxes using the flux-variance method. We investigated these issues using eddy-covariance measurements over an open, homogeneous and flat grassland in the eastern Tibetan Plateau in summer under intermediate hydrological conditions during rainy season. In unstable conditions, the temperature, water vapor, and CO2 followed the flux-variance similarity relation, but did not show in precisely the same way due to different roles (active or passive) of these scalars. Similarity constants of temperature, water vapor and CO2 were found to be 1.12,1.19 and 1.17, respectively. Heat transportation was more efficient than water vapor and CO2. Based on the estimated sensible heat flux, five parameterization methods of relative transport efficiency of heat to water vapor and CO2 were examined to estimate latent heat and CO2 fluxes. The strategy of local determination of flux-variance similarity relation is recommended for the estimation of latent heat and CO2 fluxes. This approach is better for representing the averaged relative transport efficiency, and technically easier to apply, compared to other more complex ones.

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