Journal
AGRICULTURAL AND FOREST METEOROLOGY
Volume 169, Issue -, Pages 35-50Publisher
ELSEVIER
DOI: 10.1016/j.agrformet.2012.09.010
Keywords
Eddy covariance; Aerodynamic gradient; Ozone; Flux divergence; Energy balance deficit
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Funding
- French Agency for Environment and Energy Control (ADEME) [0262030]
- French National Project ECCO
- French Ministry of Ecology and Sustainable Development
- EU
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The eddy covariance (EC) method is widely considered as the reference method for heat and trace gas exchange flux measurements. However, for some species of interest, the aerodynamic gradient method (AG) is still a valuable method. Furthermore, some useful datasets are based on the AG method. In this study we compare the EC and the AG methods for latent (LE) and sensible (H) heat, carbon dioxide (F-c) fluxes and ozone deposition velocity (V-d (O3)) over a maize field near Paris. The AG method gave roughly 15% smaller F, and LE, similar H, and 40% larger V-d (O3) than the EC method. The differences between the two methods are discussed. In particular, the effects of the displacement height and heights of measurements on the AG fluxes are explored and the similarity among heat, CO2, H2O and O-3 is tested. Furthermore, the vertical divergence of the flux above the canopy is estimated with the AG method. (C) 2012 Elsevier B.V. All rights reserved.
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