Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 3 2008 10.5194/bg-5-719-2008 http://www.biogeosciences.net/5/719/2008/ http://www.biogeosciences.net/5/719/2008/bg-5-719-2008.html http://www.biogeosciences.net/5/719/2008/bg-5-719-2008.pdf 719 729 2008-05-07 Multiple quality tests for analysing CO₂ fluxes in a beech temperate forest B. Longdoz longdoz@nancy.inra.fr P. Gross A. Granier INRA, UMR1137 Ecologie et Ecophysiologie Forestière, Centre de Nancy, F-54280 Champenoux, France Eddy covariance (EC) measurements are widely used to estimate the amount of carbon sequestrated by terrestrial biomes. The decision to exclude an EC flux from a database (bad quality records, turbulence regime not adequate, footprint problem,...) becomes an important step in the CO₂ flux determination procedure. In this paper an innovative combination of existing assessment tests is used to give a relatively complete evaluation of the net ecosystem exchange measurements. For the 2005 full-leaf season at the Hesse site, the percentage of rejected half-hours is relatively high (59.7%) especially during night-time (68.9%). This result strengthens the importance of the data gap filling method. The data rejection does not lead to a real improvement of the accuracy of the relationship between the CO₂ fluxes and the climatic factors especially during the nights. The spatial heterogeneity of the soil respiration (on a site with relatively homogenous vegetation pattern) seems large enough to mask an increase of the goodness of the fit of the ecosystem respiration measurements with a dependence on soil temperature and water content when the tests are used to reject EC data. However, the data rejected present some common characteristics. Their removal lead to an increase in the total amount of CO₂ respired (24%) and photosynthesised (16%) during the 2005 full-leaf season. 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