Experimental validation of WPL correction for CO<sub>2</sub> flux by eddy covariance technique over the asphalt surface

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  • KONDO Fumiyoshi
    Graduate School of Natural Science and Technology, Okayama University Atmosphere and Ocean Research Institute, The University of Tokyo
  • TSUKAMOTO Osamu
    Graduate School of Natural Science and Technology, Okayama University

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  • Experimental validation of WPL correction for CO₂ flux by eddy covariance technique over the asphalt surface

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Abstract

We experimentally validated the density correction (called WPL or Webb correction) over the dry asphalt surface by simultaneously measuring CO2 fluxes by closed-path eddy covariance and closed-chamber techniques, which is inescapable for evaluating the surface CO2 flux by the open-path eddy covariance technique. The total CO2 flux with WPL correction by the open-path eddy covariance technique was evaluated as a systematically small upward flux, which was consistent with that of our previous study. The instrumental error of the sonic anemometers and the additional heating correction for the open-path gas analyzer were not potential sources of total upward CO2 fluxes. The CO2 flux by the closed-chamber technique was also an upward flux; however, it was three orders of magnitude smaller than the total CO2 flux by the open-path eddy covariance technique. The CO2 flux calculated from the CO2 mixing ratio by the closed-path eddy covariance technique was almost zero. Our results suggest the possible upward overestimation of the total CO2 flux with the WPL correction by the open-path eddy covariance technique.

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