Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Fleur CouvreuxFrancoise GuichardOlivier BockBernard CampistronJean-Philippe LaforeJean-Luc Redelsperger
• Organismes : Centre national de recherches météorologiques Centre national de recherches météorologiques SPACE - LATMOS Laboratoire d'aérologie Centre national de recherches météorologiques Centre national de recherches météorologiques
• Publié dans Quarterly Journal of the Royal Meteorological Society le 27/10/2020

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Résumé : This study investigates the synoptic variability of the monsoon flux during the establishment of the West African monsoon using observations and ECMWF analyses. It highlights variability at a 3-5-day time scale, characterized by successive northward excursions of the monsoon flux. Their characteristics and climatology prior to the monsoon onset are presented. These penetrations follow a maximum of intensity of the heat-low (extension and minimum of pressure) and are concomitant with an acceleration of the low-level meridional wind. Some penetrations are stationary whereas others propagate westward simultaneously with African easterly waves. Both types are investigated in more detail by case-studies. This enables us to distinguish the boundary-layer mechanisms involved in such penetrations. A similar conceptual model holds for both. It is argued that the heat-low dynamics is a major driver of these synoptic penetrations, pointing to the predominantly continental nature of this phenomenon. In turn, the heat-low can be partitioned by the penetrations. Horizontal advection is the main process that eventually accounts for these surges; nevertheless, turbulent mixing also plays a significant role by vertically redistributing moisture, and in more subtle ways by its contribution to the shaping of the low-level synoptic environment within which the surges take place

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Ivan PetillotEmmanuel TrouvéPhilippe BolonAndreea JuleaYajing YanMichel GayJean-Michel Vanpé
• Organismes : Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Analyse et Traitement d'Images Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance GIPSA-Services GIPSA - Signal Images Physique GIPSA - Signal Images Physique
• Publié dans IEEE Geoscience and Remote Sensing Letters le 25/10/2020

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Résumé : Synthetic aperture radar (SAR) image orthorectification induces an important alteration of information due to the side-looking geometry of SAR acquisition. In high-relief areas, the difficulty is increased by the foldover effect: The images acquired with low incidence angles cannot be registered by a bijective transformation like polynomial transformations, as usually proposed by conventional software. In this letter, a simple and efficient method, fitted to geocoded data and SAR images, is introduced to propose a generic coregistration tool that takes SAR geometry into account without requiring the exact sensor model, specific parameters, and precise navigation data. This method is based on a simulated SAR image and on the computation of lookup tables (LUTs) that represent the coordinate transform from one geometry to the other. Results are presented on a high-relief area in the Alps, where satellite and airborne SAR images are used for glacier evolution monitoring. A comparison to other sensor-independent approaches has been performed, showing that the proposed approach performs better in mountain areas. The resulting LUTs allow merging SAR data with the georeferenced data, either in ground geometry by orthorectifying the SAR information or in radar geometry by the inverse transformation, namely, radar-coding data from a geographic information system, to improve the analysis of SAR images and the result interpretation.

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Fichiers liés : Petillot_GRSletters_2009.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Kiyoshi ShimamuraTakayuki KitoElias CastelAnastasiya LatyninaPablo MolinaEncarnacion G. VilloraMythili PrakasamPhilippe VeberJean-Pierre ChaminadeAkiharu FunakiTsubasa HatanakaKunihiro Naoe
• Organismes : Institut de Chimie de la Matière Condensée de Bordeaux National Institute for Materials Science National Institute for Materials Science National Institute for Materials Science National Institute for Materials Science National Institute for Materials Science Institut de Chimie de la Matière Condensée de Bordeaux National Institute for Materials Science Institut de Chimie de la Matière Condensée de Bordeaux Institut de Chimie de la Matière Condensée de Bordeaux Institut de Chimie de la Matière Condensée de Bordeaux National Institute for Materials Science Fujikura Ltd. National Institute for Materials Science Fujikura Ltd. Fujikura Ltd.
• Publié dans Crystal Growth & Design le 31/10/2020

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Résumé : {Tb3}[Sc2−xLux](Al3)O12 crystals have been grown and investigated for the first time for magneto-optical applications. Tb3Al5O12 exhibits the best magneto-optical features; however, its incongruent melting nature has led to the industrial use of Tb3Ga5O12. Tb3Sc2Al3O12 had been proposed as an alternative to Tb3Al5O12, but unfortunately its growth also presents several drawbacks. The present investigation shows that by the isovalent substitution of Sc3+ by Lu3+ in the octahedral site of the garnet structure, it is possible to improve the growth characteristics while preserving the superior magneto-optical properties. We demonstrate that {Tb3}[Sc2−xLux](Al3)O12 crystals show a higher visible transparency and a larger Faraday rotation than Tb3Ga5O12 crystals. {Tb3}[Sc2−xLux](Al3)O12 is therefore a very promising material in particular for new magneto-optical applications in the visible-near IR wavelength region.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Joffrey MoirouxCecile Le LannMajeed A. SeyahooeiPhilippe VernonJean-Sébastien PierreJoan van BaarenJacques J.M. J.M. van Alphen
• Organismes : Ecosystèmes, biodiversité, évolution [Rennes] Ecosystèmes, biodiversité, évolution [Rennes] Institute Biology Leiden Ecosystèmes, biodiversité, évolution [Rennes] Ecosystèmes, biodiversité, évolution [Rennes] Ecosystèmes, biodiversité, évolution [Rennes] Paysages, Changements Climatique, Biodiversité
• Publié dans Ecological Entomology le 22/10/2020

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Résumé : 1. Climate is an important source of selection on life histories, and local adaptations to climate have been described in several cline studies. Temperature is the main climatic factor that has been considered as an agent of selection, whereas other factors may vary with it, such as precipitation. 2. We compared life-history traits of five populations of Leptopilina boulardi, a Drosophila parasitoid, originating from contrasting climates. Referring to cline studies, we hypothesised shorter lifespan, earlier reproduction, and lower lipid content in populations from the hottest and driest areas if life histories have been selected in response to temperature and/or humidity. 3. Our results are opposite to these predictions. Females from humid and mild climates invested more in early reproduction and lived for fewer days than females from dry and hot areas, which were synovigenic (i.e. they matured additional eggs during adult life) and able to synthesise lipids during adult life. 4. We suggest that life histories are more adapted to host distribution than to climatic factors. Drosophila patches are more abundant in the humid area, allowing the parasitoids to spend less energy and time finding hosts. This may result in selection for early reproduction traded-off against longevity. In the hot and dry climate, females have to fly large distances to find host patches. Synovigeny, a long lifespan, lipogenesis, and high dispersal ability may be adaptive there. This is the first time that between-population differences in the ability to synthesise lipids have been described in parasitoids.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Veronique JuberaPhilippe VeberMarie ChavoutierAlain GarciaFrédéric AdamietzVincent RodriguezJean-Pierre ChaminadeMatias Velázquez
• Organismes : Institut de Chimie de la Matière Condensée de Bordeaux Institut de Chimie de la Matière Condensée de Bordeaux Institut de Chimie de la Matière Condensée de Bordeaux Institut de Chimie de la Matière Condensée de Bordeaux Institut des Sciences Moléculaires Institut des Sciences Moléculaires Institut de Chimie de la Matière Condensée de Bordeaux Institut de Chimie de la Matière Condensée de Bordeaux
• Publié dans CrystEngComm le 01/01/2003

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Résumé : ingle crystals of a new oxyborate, Yb-LGOB, were obtained by an original flux method and interesting spectroscopic properties of this new laser crystal are reported....

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Michael BerhanuGautier VerhilleJean BoissonBasile GalletChristophe GissingerStéphan FauveNicolas MordantFrançois PétrélisMickaël BourgoinPhilippe OdierJean-François PintonNicolas PlihonSébastien AumaîtreArnaud ChiffaudelFrançois DaviaudBérengère DubrulleChristophe Pirat
• Organismes : Laboratoire de Physique Statistique de l'ENS Laboratoire de Physique de l'ENS Lyon Service de physique de l'état condensé Laboratoire de Physique Statistique de l'ENS Laboratoire de Physique Statistique de l'ENS Laboratoire de Physique Statistique de l'ENS Laboratoire de Physique Statistique de l'ENS Laboratoire de Physique Statistique de l'ENS Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] Laboratoire de Physique de l'ENS Lyon Laboratoire de Physique de l'ENS Lyon Laboratoire de Physique de l'ENS Lyon Service de physique de l'état condensé Service de physique de l'état condensé Service de physique de l'état condensé Service de physique de l'état condensé Service de physique de l'état condensé
• Publié dans The European Physical Journal B: Condensed Matter and Complex Systems le 23/10/2020

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Résumé : The Von Kármán Sodium experiment yields a variety of dynamo regimes, when asymmetry is imparted to the flow by rotating impellers at different speed F1 and F2. We show that as the intensity of forcing, measured as F1 + F2, is increased, the transition to a self-sustained magnetic field is always observed via a supercritical bifurcation to a stationary state. For some values of the asymmetry parameter θ = (F1−F2)/(F1+F2), time dependent dynamo regimes develop. They are observed either when the forcing is increased for a given value of asymmetry, or when the amount of asymmetry is varied at sufficiently high forcing. Two qualitatively different transitions between oscillatory and stationary regimes are reported, involving or not a strong divergence of the period of oscillations. These transitions can be interpreted using a low dimensional model based on the interactions of two dynamo modes.

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Fichiers liés : Berhanu_EPJB_77.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Claudio Guillermo MenéndezManuel de CastroJean-Philippe BoulangerA. d'OnofrioE. SanchezAnna SörenssonJ. BlazquezA. ElizaldeD. JacobHervé Le TreutZ.X. LiMario Nestor NúñezN. PessacgS. PfeifferM. RojasA. RollaP. SamuelssonS.A. SolmanC. Teichmann
• Organismes : Centro de Investigaciones del Mar y la Atmósfera Departamento de Computación [Buenos Aires] Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Toledo, Spain Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques Departamento de Computación [Buenos Aires] Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Toledo, Spain Centro de Investigaciones del Mar y la Atmósfera Centro de Investigaciones del Mar y la Atmósfera Facultad de Ciencias del Medio Ambiente, Universidad de Castilla-La Mancha, Toledo, Spain Max Planck Institute for Meteorology Max Planck Institute for Meteorology Laboratoire de Météorologie Dynamique (UMR 8539) Laboratoire de Météorologie Dynamique (UMR 8539) Centro de Investigaciones del Mar y la Atmósfera Centro de Investigaciones del Mar y la Atmósfera Max Planck Institute for Meteorology Departamento de Geofísica [Santiago] Centro de Investigaciones del Mar y la Atmósfera Rossby Centre, SMHI, Norrköping, 601 76, Sweden Centro de Investigaciones del Mar y la Atmósfera Departamento de Computación [Buenos Aires] Max Planck Institute for Meteorology
• Publié dans Climatic Change le 30/10/2020

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Résumé : We investigate the performance of one stretched-grid atmospheric global model, five different regional climate models and a statistical downscaling technique in simulating 3 months (January 1971, November 1986, July 1996) characterized by anomalous climate conditions in the southern La Plata Basin. Models were driven by reanalysis (ERA-40). The analysis has emphasized on the simulation of the precipitation over land and has provided a quantification of the biases of and scatter between the different regional simulations. Most but not all dynamical models underpredict precipitation amounts in south eastern South America during the three periods. Results suggest that models have regime dependence, performing better for some conditions than others. The models' ensemble and the statistical technique succeed in reproducing the overall observed frequency of daily precipitation for all periods. But most models tend to underestimate the frequency of dry days and overestimate the amount of light rainfall days. The number of events with strong or heavy precipitation tends to be under simulated by the models. © The Author(s) 2009.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2010
• Auteurs : Damien TranHansy HaberkornPhilippe SoudantPierre CiretJean-Charles Massabuau
• Organismes : Environnements et Paléoenvironnements OCéaniques Laboratoire des Sciences de l'Environnement Marin (LEMAR) Laboratoire des Sciences de l'Environnement Marin (LEMAR) Environnements et Paléoenvironnements OCéaniques Environnements et Paléoenvironnements OCéaniques
• Publié dans Aquaculture le 01/11/2020

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Résumé : We describe the valve-activity behavior of oysters, Crassostrea gigas, exposed experimentally to the harmful alga Alexandrium minutum (≈ 3500 cell ml− 1) for 7-day periods under laboratory conditions. Our aim was to assess behavioral responses of oyster species during a mimicked bloom exposure. We determined different characteristic parameters of valve activity, such as daily valve opening duration, daily number of micro-closures, and valve-opening amplitude using a High Frequency-Non Invasive valvometer. In comparison with oysters exposed to non-toxic algae, T-Isochrysis or Heterocapsa triquetra, the valve activity of C. gigas is measurably different when exposed to toxic algae A. minutum. Surprisingly, daily valve-opening duration increased, as well as micro-closure activity, while valve-opening amplitude decreased. The response to A. minutum is fast, within 1 h after algae exposure. Following A. minutum exposure, recovery to control patterns was observed within 4-5 days. The behavioral alterations upon exposure to A. minutum can be thus used as a complementary physiological variable to other well-established physiological and biochemical measurements.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2010
• Auteurs : Sergio MolinariAlain AbergelAlana Rivera-IngrahamAlberto Noriega-CrespoAlessio TraficanteAnna Di GiorgioAnnie ZavagnoAntonio ChrysostomouArabino RoyAli BabarBerlinda MaioloBernhard SchulzBiwei JiangBruce SibthorpeBruce SwinyardCara BattersbyCarlo BuriganaChris BruntChris DavisChristine JoblinChristoffel WaelkensClaude MenyClaudio CodellaCristina PopescuDanae PolychroniDavid EdenDavid IkhenaodeDavide EliaDeborah ParadisDebra ShepherdDelphine RusseilD. Ward-ThompsonDimitris StamatellosDouglas MarshallEckhard SturmE. RosolowskyEugenio SchisanoFabiana FaustiniFabio AgostiniFabrizio MassiFederico La MorgiaFrancesco PiacentiniFrancesco StrafellaFrancois BoulangerF. SchullerFrédérique MotteFriedrich WyrowskiGary FullerGiancarlo de GasperisGilles JoncasGiovanna GiardinoGlenn WhiteGrazia UmanaGuilaine LagacheGuillaume RivestGuy StringfellowHarold YorkeIsabelle RistorcelliJames DifrancescoJan BrandJason GlennJason KirkJavier RodonJean-Paul BaluteauJean-Philippe BernardJinzeng LiJoao NevesJoe MottramJoerg FischeraJohn BallyJohn RicherJoris BlommaertJose CernicharoK. GangaLarry MorganLeonardo TestiLoren AndersonLorenzo PiazzoLoretta CampeggioLuca ConversiLuca OlmiLuca ValenzianoLudovic MontierLuigi SpinoglioMaite BeltranMaohai HuangMarc-Antoine Miville-DeschenesMarc SauvageMarcella VenezianiMark C. ThompsonMartin CohenMartin GiardM. MarengoMathieu CompiegneMatt GriffinMelanie PomaresMelvin HoareMichael BarlowMichael BurtonMichael F. ReidMichael SmithMichele PestalozziMika JuvelaMikako MatsuuraMilena BenedettiniN. SchneiderNicolas BillotNicolas PerettoOlivier BernéPaola CaselliPaolo DebernardisPaolo NatoliPaolo SaracenoPaul F. GoldsmithPedro Garcia LarioPeter MartinPeter SchilkePhil LucasPhilippe AndrePierre RoyerQizhou ZhangRene PlumeRiccardo CesaroniRichard TuffsRoberta PaladiniRoland VavrekRuss TaylorSean CareySerena VitiSilvia MasiStefano PezzutoSteve LordSukanya ChakrabartiSylvain BontempsTanya LimThomas D MuellerThomas RobitailleTobias TroostToby MooreVincent MinierWilliam ReachYasuo Fukui
• Organismes : Institut d'astrophysique spatiale Observatoire Astronomique de Marseille Provence Laboratoire d'Astrophysique de Marseille Centre d'étude spatiale des rayonnements CHU Pitié-Salpêtrière [AP-HP] Neurologie et thérapeutique expérimentale Centre d'étude spatiale des rayonnements Observatoire Astronomique de Marseille Provence INAF- Osservatorio Astrofisico di Arcetri Institut d'astrophysique spatiale Laboratoire de Physique des Lasers Astrophysique Interprétation Modélisation Max-Planck-Institut für Radioastronomie SLAC National Accelerator Laboratory Institut d'astrophysique spatiale Centre d'étude spatiale des rayonnements Istituto di Radioastronomia [Bologna] Observatoire Astronomique de Marseille Provence Laboratoire d'Astrophysique de Marseille Centre d'étude spatiale des rayonnements Center for Astrophysics and Space Astronomy [Boulder] Centro de Astrobiologia [Madrid] Centro de Investigaciones Biológicas APC - Cosmologie INAF- Osservatorio Astrofisico di Arcetri Antarctic Research a European Network for Astrophysics Department of Mechanical and Aerospace Engineering [Victoria]] Centre d'étude spatiale des rayonnements Institut d'astrophysique spatiale Observatoire Astronomique de Marseille Provence Istituto Nazionale di Geofisica e Vulcanologia – Sezione di Pisa Department of Physics and Astronomy University of Manchester [Manchester] Département d'Astrophysique (ex SAP) Centre d'étude spatiale des rayonnements INAF- Osservatorio Astrofisico di Arcetri Jet Propulsion Laboratory I. Physikalisches Institut [Köln] Recherche en épidémiologie et biostatistique Laboratoire de Nanotechnologie et d'Instrumentation Optique Institute of Atomic Physics Department of Physics and Astronomy [Calgary] FORMATION STELLAIRE 2010 Max-Planck-Institut für Extraterrestrische Physik Astrophysique Interprétation Modélisation

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Résumé : From diffuse interstellar cirrus to dense atomic and molecular clouds, from protostellar to post-AGB envelopes, from super-shells to supernovae remnants, the Herschel Hi-GAL survey offer an unprecedented snapshot of all the different phases of the Galactic ISM, its evolution and interactions. I will present early results on a variety of topics including the lifetime of massive pre-stellar phases, the fragmentation and collapse of extended structures, the timeline for massive star formation, dust properties in cirrus and molecular clouds.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2010
• Auteurs : K.R. Philippe AugusteH. MaheA.K. FerchichiH.W. LiJean-Pierre Vilcot
• Organismes : Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520

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