Philippe JEAN-PIERRE

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2007
• Auteurs : Philippe Bordes
• Organismes : Art, images, sociétés

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Hervé SinoquetJean StephanGabriel SonohatPierre-Éric LauriPhilippe Monney
• Organismes : Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier Laboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier Ecole Nationale d'Ingénieurs des Travaux Agricoles de Clermont-Ferrand Développement et amélioration des plantes Centre de Fougères
• Publié dans New Phytologist le 01/11/2020

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Résumé : Simple models of light interception are useful to identify the key structural parameters involved in light capture. We developed such models for isolated trees and tested them with virtual experiments. Light interception was decomposed into the projection of the crown envelope and the crown porosity. The latter was related to tree structure parameters. Virtual experiments were conducted with three-dimensional (3-D) digitized apple trees grown in Lebanon and Switzerland, with different cultivars and training. The digitized trees allowed actual values of canopy structure (total leaf area, crown volume, foliage inclination angle, variance of leaf area density) and light interception properties (projected leaf area, silhouette to total area ratio, porosity, dispersion parameters) to be computed, and relationships between structure and interception variables to be derived. The projected envelope area was related to crown volume with a power function of exponent 2/3. Crown porosity was a negative exponential function of mean optical density, that is, the ratio between total leaf area and the projected envelope area. The leaf dispersion parameter was a negative linear function of the relative variance of leaf area density in the crown volume. The resulting models were expressed as two single equations. After calibration, model outputs were very close to values computed from the 3-D digitized databases.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Valérie EminJean-Philippe PerninMichèle PrieurEric Sanchez
• Organismes : Modèles et Technologies pour l’Apprentissage Humain Modèles et Technologies pour l’Apprentissage Humain Institut National de Recherche Pédagogique Institut National de Recherche Pédagogique
• Publié dans International Journal of Technologies in Higher Education le 06/12/2007

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Résumé : no abstract

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2007
• Auteurs : Jean CorneloupPhilippe BourdeauPascal Mao
• Organismes : Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2007
• Auteurs : Jean CorneloupPhilippe BourdeauPascal Mao
• Organismes : Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2007
• Auteurs : Benoît ClavelCorinne Feïss-JehelJean Olivier GuilhotPierre-Jérôme JehelSandrine MounyJean-Michel MoutonClaudine PiatonPhilippe Racinet
• Organismes : Muséum national d'Histoire naturelle École Pratique des Hautes Études PROCLAC - Proche-Orient—Caucase : langues, archéologie, cultures Ministère de la Culture GOBELINS Paris Textes, Représentations, Archéologie, Autorité et Mémoire de l'Antiquité à la Renaissance - UR UPJV 4284 PROCLAC - Proche-Orient—Caucase : langues, archéologie, cultures L'information visuelle et textuelle en histoire de l'art : nouveaux terrains, corpus, outils Textes, Représentations, Archéologie, Autorité et Mémoire de l'Antiquité à la Renaissance - UR UPJV 4284

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2007
• Auteurs : Hervé DelingetteMaxime SermesantJean-Marc PeyratNicholas AyacheKawal S. RhodeReza RazaviElliot R. McveighDominique ChapelleJacques Sainte-MariePhilippe MoireauMiguel Angel FernándezJean-Frédéric GerbeauK. DjabellaQ. ZhangMichel Sorine
• Organismes : Analysis and Simulation of Biomedical Images Analysis and Simulation of Biomedical Images Analysis and Simulation of Biomedical Images Analysis and Simulation of Biomedical Images Division of Imaging Sciences Division of Imaging Sciences NIHR Biomedical Research Centre [London] Analysis and Simulation of Biomedical Images Department of Biomedical Engineering [Baltimore] Laboratory of Cardiac Energetics Modeling, analysis and control in computational structural dynamics Modeling, analysis and control in computational structural dynamics Laboratoire d'Hydraulique Saint-Venant / Saint-Venant Laboratory for Hydraulics Modeling, analysis and control in computational structural dynamics Numerical simulation of biological flows Numerical simulation of biological flows Centre d'Enseignement et de Recherche en Mathématiques, Informatique et Calcul Scientifique Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 Centre d'Etudes Nucléaires de Bordeaux Gradignan SIgnals and SYstems in PHysiology & Engineering

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Résumé : no abstract

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Wigneron J.-P.Yann H. KerrPhilippe WaldteufelKauzar Saleh ContellMaria Jose EscorihuelaPhilippe RichaumePaolo FerrazzoliPatricia de RosnayRobert GurneyJean-Christophe CalvetJennifer P. GrantMassimo GuglielmettiBrian K. HornbuckleChristian MatzlerThierry PellarinMike Schwank
• Organismes : Écologie fonctionnelle et physique de l'environnement Centre d'études spatiales de la biosphère Service d'aéronomie Écologie fonctionnelle et physique de l'environnement Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Università degli Studi di Roma Tor Vergata [Roma, Italia] = University of Rome Tor Vergata [Rome, Italy] = Université de Rome Tor Vergata [Rome, Italie] Centre d'études spatiales de la biosphère Natural Environment Research Council Centre national de recherches météorologiques Faculty of Earth and Life Sciences [Amsterdam] Department of Computer Science [ETH Zürich] Iowa State University Institute of Applied Physics [Bern] Laboratoire d'étude des transferts en hydrologie et environnement Department of Computer Science [ETH Zürich]
• Publié dans Remote Sensing of Environment le 28/10/2020

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Résumé : In the near future, the SMOS (Soil Moisture and Ocean Salinity) mission will provide global maps of surface soil moisture (SM). The SMOS baseline payload is an L-band (1.4 GHz) two dimensional interferometric microwave radiometer which will provide multi-angular and dual-polarization observations. In the framework of the ground segment activities for the SMOS mission an operational SMOS Level 2 Soil Moisture algorithm was developed. The principle of the algorithm is to exploit multi-angular data in order to retrieve simultaneously several surface parameters including soil moisture and vegetation characteristics. The algorithm uses an iterative approach, minimizing a cost function computed from the differences between measured and modelled brightness temperature (TB) data, for all available incidence angles. In the algorithm, the selected forward model is the so-called L-MEB (L-band Microwave Emission of the Biosphere) model which was the result of an extensive review of the current knowledge of the microwave emission of various land covers. This model is a key element in the SMOS L2 algorithm and could be used in future assimilation studies. There is thus a strong need for a reference study, describing the model and its implementation. In order to address these needs a detailed description of soil and vegetation modelling in L-MEB is given in this study. In a second step, the use of L-MEB in soil moisture retrievals is evaluated for several experimental data sets over agricultural crops. Calibrations of the soil and vegetation L-MEB parameters are investigated for corn, soybean and wheat. Over the different experiments, very consistent results are obtained for each vegetation type in terms of calibration and soil moisture retrievals.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Jean-Philippe DuvelJérôme Vialard
• Organismes : Laboratoire de Météorologie Dynamique (UMR 8539) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
• Publié dans Journal of Climate le 02/11/2020

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Résumé : Since the ISV of the convection is an intermittent phenomenon, the local mode analysis (LMA) technique is used to detect only the ensemble of intraseasonal events that are well organized at large scale. The LMA technique is further developed in this paper in order to perform multivariate analysis given patterns of SST and surface wind perturbations associated specifically with these intraseasonal events. During boreal winter, the basin-scale eastward propagation of the convective perturbation is present only over the Indian Ocean Basin. The intraseasonal SST response to convective perturbations is large and recurrent over thin mixed layer regions located north of Australia and in the Indian Ocean between 5° and 10°S. By contrast, there is little SST response in the western Pacific basin and no clear eastward propagation of the convective perturbation. During boreal summer, the SST response is large over regions with thin mixed layers located north of the Bay of Bengal, in the Arabian Sea, and in the China Sea. The northeastward propagation of the convective perturbation over the Bay of Bengal is associated with a standing oscillation of the SST and the surface wind between the equator and the northern part of the bay. In fact, many intraseasonal events mostly concern a single basin, suggesting that the interbasin organization is not a necessary condition for the existence of coupled intraseasonal perturbations of the convection. The perturbation of the surface wind tends to be larger to the west of the large-scale convective perturbation (like for a Gill-type dynamical response). For eastward propagating perturbations, the cooling due to the reinforcement of the wind (i.e., surface turbulent heat flux) thus generally lags the radiative cooling due to the reduction of the surface solar flux by the convective cloudiness. This large-scale Gill-type response of the surface wind also cools the surface to the west of the basin (northwest Arabian Sea and northwest Pacific Ocean), even if the convection is locally weak. An intriguing result is a frequently occurring small delay between the maximum surface wind and the minimum SST. Different explanations are invoked, like a rapid surface cooling due to the vanishing of an ocean warm layer (diurnal surface warming due to solar radiation in low wind conditions) as soon as the wind increases.

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Fichiers liés : [15200442 - Journal of Climate] Indo-Pacific Sea Surface Temperature Perturbations Associated with Intraseasonal Oscillations of Tropical Convection.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : T. RobinetÉric FeunteunElodie RéveillacPhilippe KeithG. MarquetJean Michel OlivierP. Valade
• Organismes : Biologie des organismes marins et écosystèmes Biologie des organismes marins et écosystèmes Laboratoire d'Ecologie des Hydrosystèmes Fluviaux
• Publié dans Environmental Biology of Fishes le 01/01/2003

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