Unpublished conference/Abstract (Scientific congresses and symposiums)
Canopy aerodynamic distance (z-d) estimation and impact on eddy covariance measurements
Hurdebise, Quentin; De Ligne, Anne; Vincke, Caroline et al.
2017European Geosciences Union 2017
 

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Keywords :
Eddy covariance; Canopy aerodynamic distance; Turbulence
Abstract :
[en] Understanding if and how the spatial and temporal variability of the surrounding environment affects turbulence is essential for long-term eddy covariance measurements above growing and heterogeneous ecosystems. It requires characterizing the surrounding environment. One way to achieve this is to analyse the canopy aerodynamic distance, which is the difference between measurement height (z) and displacement height (d). In this study, twenty years of eddy covariance measurements from the Vielsalm Terrestrial Observatory, a site located in a mixed temperate forest, were used. Canopy aerodynamic distance (z-d) estimates were obtained using two micrometeorological methods: the first one, which is original so far as we know, was based on analysing sensible heat cospectra; the second one was derived from the wind speed profile equation. Canopy height estimates based on inventories were used to validate both methods. The micrometeorological methods allowed the z-d variations due to changes in canopy or measurement height to be detected. In addition, the results obtained using the two methods were well correlated, spatially and temporally, with the z-d derived from canopy height measurements. The micrometeorological approaches used could therefore be a promising tool for investigating z-d variability at a high directional and temporal resolution. Questions remain, however, particularly with regard to the variability observed that cannot be explained by canopy or measurement height variation. Forest management practices and the non-fulfilment of similarity relationships were suspected to be the main explanatory factors.
Research center :
TERRA Teaching and Research Centre - TERRA
Disciplines :
Physics
Author, co-author :
Hurdebise, Quentin ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
De Ligne, Anne ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Vincke, Caroline;  Université Catholique de Louvain - UCL > Earth and Life Institute > Forest sciences
Heinesch, Bernard  ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Aubinet, Marc ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Language :
English
Title :
Canopy aerodynamic distance (z-d) estimation and impact on eddy covariance measurements
Alternative titles :
[fr] Estimation de la distance aérodynamique de la canopée et étude de son impact sur les mesures par eddy covariance
Publication date :
24 April 2017
Event name :
European Geosciences Union 2017
Event organizer :
European Geosciences Union
Event place :
Vienna, Austria
Event date :
du 23 avril 2017 au 28 avril 2017
Audience :
International
References of the abstract :
Geophysical Research Abstracts 2017. Munich, Germany : Copernicus GmbH. (2017).
Name of the research project :
CO2 fluxes interannual variability at the Vielsalm Terrestrial Observatory
Funders :
SPW DG03-DGARNE - Service Public de Wallonie. Direction Générale Opérationnelle Agriculture, Ressources naturelles et Environnement [BE]
Available on ORBi :
since 03 June 2017

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