[en] We analyze how biases of meteorological drivers impact the calculation of ecosystem CO2, water and energy fluxes by models. To do so, we drive the same ecosystem model by meteorology from gridded products and by meteorology from local observation at eddy-covariance flux sites. The study is focused on six flux tower sites in France spanning across a climate gradient of 7-14 °C annual mean surface air temperature and 600-1040 mm mean annual rainfall, with forest, grassland and cropland ecosystems. We evaluate the results of the ORCHIDEE process-based model driven by meteorology from four different analysis data sets against the same model driven by site-observed meteorology. The evaluation is decomposed into characteristic time scales. The main result is that there are significant differences in meteorology between analysis data sets and local observation. The phase of seasonal cycle of air temperature, humidity and shortwave downward radiation is reproduced correctly by all meteorological models (average <i>R</i>2 Combining double low line 0.90). At sites located in altitude, the misfit of meteorological drivers from analysis data sets and tower meteorology is the largest. We show that day-to-day variations in weather are not completely well reproduced by meteorological models, with <i>R</i>2 between analysis data sets and measured local meteorology going from 0.35 to 0.70. The bias of meteorological driver impacts the flux simulation by ORCHIDEE, and thus would have an effect on regional and global budgets. The forcing error, defined by the simulated flux difference resulting from prescribing modeled instead of observed local meteorology drivers to ORCHIDEE, is quantified for the six studied sites at different time scales. The magnitude of this forcing error is compared to that of the model error defined as the modeled-minus-observed flux, thus containing uncertain parameterizations, parameter values, and initialization. The forcing error is on average smaller than but still comparable to model error, with the ratio of forcing error to model error being the largest on daily time scale (86%) and annual time scales (80%). The forcing error incurred from using a gridded meteorological data set to drive vegetation models is therefore an important component of the uncertainty budget of regional CO2, water and energy fluxes simulations, and should be taken into consideration in up-scaling studies.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Zhao, Yan; Laboratoire des Sciences du Climat et de l’Environnement, CEA-CNRS-UVSQ, Gif-sur-Yvette, France
Ciais, P.; Laboratoire des Sciences du Climat et de l'Environnement, UMR8212, CEA-CNRS-UVSQ, 91191 Gif-sur-Yvette, France
Peylin, P.; Laboratoire de BiogEochimie Isotopique, LBI, BAtiment EGER, 78026 Thiverval-Grignon, France
Viovy, N.; Laboratoire des Sciences du Climat et de l'Environnement, UMR8212, CEA-CNRS-UVSQ, 91191 Gif-sur-Yvette, France
Longdoz, Bernard ; INRA, Centre INRA de Nancy, Ecologie et Ecophysiologie Forestières, Champenoux, France
Bonnefond, J. M.; INRA, UMR1263, EPHYSE, 33140, Villenave d'Ormon, France
Rambal, S.; Dream CEFE-CNRS, 1919 route de Mende, 34293 Montpellier, France
Klumpp, K.; INRA, Grassland Ecosystem Research, 234 Avenue du BrEzet, Clermont-Ferrand, 63039, France
Olioso, A.; INRA, UMR1114, EMMAH, Domaine Saint-Paul, 84914 Avignon Cedex 9, France, UAPV, UMR1114, EMMAH, 33, Rue Lois Pasteur, 84000, Avignon, France
Cellier, P.; INRA, UMR1091, Environnement et Grandes Cultures, 78850 Thiverval-Grignon, France
Maignan, F.; Laboratoire des Sciences du Climat et de l'Environnement, UMR8212, CEA-CNRS-UVSQ, 91191 Gif-sur-Yvette, France
Eglin, T.; Laboratoire des Sciences du Climat et de l'Environnement, UMR8212, CEA-CNRS-UVSQ, 91191 Gif-sur-Yvette, France
Calvet, J. C.; CNRM/GAME, MEtEo-France, CNRS, 42 avenue Coriolis, 31057 Toulouse Cedex 1, France
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