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Flux-Variance Method for Latent Heat and Carbon Dioxide Fluxes in Unstable Conditions

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Abstract

Applied previously to momentum and heat fluxes, the present study extends the flux-variance method to latent heat and CO2 fluxes in unstable conditions. Scalar similarity is also examined among temperature (θ), water vapour (q), and CO2 (c). Temperature is adopted as the reference scalar, leading to two feasible strategies to estimate latent heat and CO2 fluxes: the first one relies on flux-variance similarity relations for scalars, while the second is based on the parameterization of relative transport efficiency in terms of scalar correlation coefficient and a non-dimensional quantity. The relationship between the θ-to-q transport efficiency (λ θ q ) and θ-q correlation coefficient (R θ q ) is used to describe the intermediate hydrological conditions. We also parameterize the θ-to-c transport efficiency (λ θ c ) as a function of the θ-c correlation coefficient (R θ c ) by introducing a new non-dimensional ratio (α). The flux-variance method is a viable technique for flux gap-filling, when turbulence measurements of wind velocity are not available. It is worth noting that the extended method is not exempt from a correction for density effects when used for estimating water or carbon exchange.

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Authors and Affiliations

  1. Department of Atmospheric Science, School of Physics, Peking University, 100871, Beijing, People’s Republic of China

    Xiaofeng Guo & Hongsheng Zhang

  2. Department of Environmental Sciences, Peking University, 100871, Beijing, People’s Republic of China

    Xuhui Cai, Ling Kang & Tong Zhu

  3. Laboratory for Environmental Physics, The University of Georgia, Griffin, GA, USA

    Monique Y. Leclerc

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  1. Xiaofeng Guo
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  2. Hongsheng Zhang
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  3. Xuhui Cai
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  5. Tong Zhu
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  6. Monique Y. Leclerc
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Correspondence to Hongsheng Zhang.

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Guo, X., Zhang, H., Cai, X. et al. Flux-Variance Method for Latent Heat and Carbon Dioxide Fluxes in Unstable Conditions. Boundary-Layer Meteorol 131, 363–384 (2009). https://doi.org/10.1007/s10546-009-9377-3

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