Evaluation of turbulence parameters in methane fluxes for an irrigated rice paddy
DOI:
https://doi.org/10.5902/2179460X45265Keywords:
Eddy Covariance, Methane, TurbulenceAbstract
Methane (CH4) is one of the main greenhouse gases. An important source of CH4 emission is flooded rice paddy. In this paper, the Eddy Covariance methodology was used to estimate the surface fluxes of CH4 in a flooded rice paddy in the Southern Brazil (lat: -30.2771 N; long: -53.1479 W; altitude - 40.5 m). In the event of low turbulence, this method can generate unrealistic flux data. In this situation, it is recommended remove the flux of the dataset. In general, the friction velocity (u*) is used to remove CH4 flux in low turbulence situations. However, u* is a flux and the use of the standard deviation of vertical velocity fluctuations (σw) can be an alternative. The objective of this work is to analyze the behavior of CH4 flux with friction velocity (u*), with the standard deviation of vertical velocity fluctuations (σw), and with atmospheric and soil variables in a flooded rice paddy.
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