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Evaluation of land surface model simulations of evapotranspiration over a 12 year crop succession: impact of the soil hydraulic properties

hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
dc.contributor.authorGARRIGUES, Sébastien
hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
dc.contributor.authorOLIOSO, Albert
hal.structure.identifierCentre national de recherches météorologiques [CNRM]
dc.contributor.authorCALVET, J.C.
hal.structure.identifierCentre national de recherches météorologiques [CNRM]
dc.contributor.authorMARTIN, E.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorLAFONT, Sebastien
hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
dc.contributor.authorMOULIN, Sophie
hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
dc.contributor.authorCHANZY, André
hal.structure.identifierEcologie des Forêts Méditerranéennes [URFM]
dc.contributor.authorMARLOIE, Olivier
hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
dc.contributor.authorDESFONDS, Veronique
hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
dc.contributor.authorBERTRAND, Nadine
hal.structure.identifierEnvironnement Méditerranéen et Modélisation des Agro-Hydrosystèmes [EMMAH]
dc.contributor.authorRENARD, Dominique
dc.date.accessioned2024-04-08T12:10:39Z
dc.date.available2024-04-08T12:10:39Z
dc.date.issued2014
dc.identifier.issn1812-2108
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196646
dc.description.abstractEnEvapotranspiration has been recognized as one of the most uncertain term in the surface water balance simulated by land surface models. In this study, the SURFEX/ISBAA- gs simulations of evapotranspiration are assessed at local scale over a 12 year 5 Mediterranean crop succession. The model is evaluated in its standard implementation which relies on the use of the ISBA pedotransfer estimates of the soil properties. The originality of this work consists in explicitly representing the succession of crop cycles and inter-crop bare soil periods in the simulations and assessing its impact on the dynamic of simulated and measured evapotranspiration over a long period of time. 10 The analysis focuses on key soil parameters which drive the simulation of evapotranspiration, namely the rooting depth, the soil moisture at saturation, the soil moisture at field capacity and the soil moisture at wilting point. The simulations achieved with the standard values of these parameters are compared to those achieved with the in situ values. The portability of the ISBA pedotransfer functions is evaluated over a typical 15 Mediterranean crop site. Various in situ estimates of the soil parameters are considered and distinct parametrization strategies are tested to represent the evapotranspiration dynamic over the crop succession. This work shows that evapotranspiration mainly results from the soil evaporation when it is continuously simulated over a Mediterranean crop succession. The evapo20 transpiration simulated with the standard surface and soil parameters of the model is largely underestimated. The deficit in cumulative evapotranspiration amounts to 24% over 12 years. The bias in daily daytime evapotranspiration is −0.24mmday−1. The ISBA pedotransfer estimates of the soil moisture at saturation and at wilting point are overestimated which explains most of the evapotranspiration underestimation. The 25 overestimation of the soil moisture at wilting point causes the underestimation of transpiration at the end of the crop cycles. The overestimation of the soil moisture at saturation triggers the underestimation of the soil evaporation during the wet soil periods. The use of field capacity values derived from laboratory retention measurements leads to inaccurate simulation of soil evaporation due to the lack of representativeness of the soil structure variability at the field scale. The most accurate simulation is achieved with the values of the soil hydraulic properties derived from field measured soil moisture. Their temporal analysis over each crop cycle provides meaningful estimates of the 5 wilting point, the field capacity and the rooting depth to represent the crop water needs and accurately simulate the evapotranspiration over the crop succession. We showed that the uncertainties in the eddy-covariance measurements are significant and can explain a large part of the unresolved random differences between the simulations and the measurements of evapotranspiration. Other possible model shortcomings include 10 the lack of representation of soil vertical heterogeneity and root profile along with inaccurate energy balance partitioning between the soil and the vegetation at low LAI.
dc.language.isoen
dc.publisherEuropean Geosciences Union
dc.subjectpropriété hydraulique du sol
dc.subjectmodèle de simulation
dc.subjectrotation des cultures
dc.subjectparamètre de surface
dc.subjectzone méditerranéenne
dc.subject.ensimulation models
dc.subject.enrotation of crops
dc.subject.enevapotranspiration
dc.title.enEvaluation of land surface model simulations of evapotranspiration over a 12 year crop succession: impact of the soil hydraulic properties
dc.typeArticle de revue
dc.identifier.doi10.5194/hessd-11-11687-2014
dc.subject.halSciences du Vivant [q-bio]/Sciences agricoles
bordeaux.journalHydrology and Earth System Sciences Discussions
bordeaux.page11687-11733
bordeaux.volume11
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue10
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewednon
hal.identifierhal-01594428
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01594428v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Hydrology%20and%20Earth%20System%20Sciences%20Discussions&rft.date=2014&rft.volume=11&rft.issue=10&rft.spage=11687-11733&rft.epage=11687-11733&rft.eissn=1812-2108&rft.issn=1812-2108&rft.au=GARRIGUES,%20S%C3%A9bastien&OLIOSO,%20Albert&CALVET,%20J.C.&MARTIN,%20E.&LAFONT,%20Sebastien&rft.genre=article


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