Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : David MalkaNicolas GirardDavid M SmadjaChristine ChevreauStéphane CulineAnne LesurRoman RouzierFrançois RozetJean-Philippe SpanoJean-Yves Blay
• Organismes : Dynamique des cellules tumorales Epidémiologie, Systèmes d'Information, Modélisation
• Publié dans Bulletin du Cancer le 01/11/2020

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Résumé : La thrombose associée au cancer est une complication fréquente résultant de divers mécanismes vasculaires liés au cancer, au traitement antitumoral et au patient, et qui est associée à un mauvais pronostic. L’anticoagulation recommandée, en prévention ou en traitement curatif, repose essentiellement sur les héparines de bas poids moléculaire (HBPM) ou les anticoagulants oraux directs. L’enjeu de la thromboprophylaxie, pour laquelle les HBPM sont privilégiées en raison d’un moindre risque hémorragique notamment en cas de tumeur digestive endoluminale ou urothéliale en place, demeure l’identification des patients à risque. La question majeure concernant la prise en charge des thromboses avérées est le choix de l’anticoagulant. Du fait de la simplicité de leur administration, les anticoagulants oraux directs apparaissent comme attractifs, et les études randomisées les ayant évalués ont montré leur efficacité. Cependant, ces études sont limitées par le profil des patients inclus qui ne sont pas toujours représentatifs des situations en vraie vie, notamment concernant les cancers à risque hémorragique et certains traitements antitumoraux, inhibiteurs de tyrosine kinase notamment, qui peuvent interagir avec les anticoagulants oraux directs et en modifier potentiellement la biodisponibilité. Les recommandations disponibles soulignent ces précautions et renvoient in fine à des décisions au cas par cas. Cet article a pour but de guider l’oncologue dans son choix d’anticoagulation à travers une série de réponses documentées et pragmatiques aux questions qui se posent face à un patient pris en charge pour une tumeur solide et potentiellement à risque de thrombose ou avec une thrombose établie.

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Fichiers liés : [Prophylaxis and management of cancer-associated thrombosis Practical issues about anticoagulant use]..pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Cyrielle RolleyPhilippe BarthelemyKarim BensalahFrançois-Xavier NouhaudArnauld VillersFranck BruyèreSouhil LebdaiSolène RicardMarine Gross-GoupilMorgan RouprêtJean-Christophe BernhardPierre Bigot
• Organismes : Laboratoire Traitement du Signal et de l'Image
• Publié dans Clinical Genitourinary Cancer le 26/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Pinto SergeAdelheid NebelJörn RauRobert EspesserPauline MaillochonOliver NiebuhrPaul KrackTatiana WitjasAlain GhioMarie‐charlotte CuarteroLars TimmermannAlfons SchnitzlerHelke HesekampNiklaus MeierJulia MüllnerThomas HälbigBettina MöllerSteffen PaschenLaura PaschenJens VolkmannMichael BarbeGereon FinkJohannes BeckerPaul RekerAndrea KühnGerd‐helge SchneiderValérie FraixEric SeigneuretAndrea KistnerOlivier J. RascolChristine Brefel-CourbonFabienne Ory MagneChristian HartmannLars WojteckiAnne FradetDavid MaltêtePhilippe DamierSéverine Le DilyFriederike Sixel-DöringPetra BeneckeDaniel WeissTobias WächterMarcus PinskerJean RégisStéphane ThoboisGustavo PoloJean‐luc HouetoAndreas HartmannKarina KnudsenMarie VidailhetMichael SchüpbachGünther Deuschl
• Organismes : Laboratoire Parole et Langage University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein Philipps Universität Marburg = Philipps University of Marburg Laboratoire Parole et Langage Laboratoire Parole et Langage Christian-Albrechts-Universität zu Kiel = Christian-Albrechts University of Kiel = Université Christian-Albrechts de Kiel [GIN] Grenoble Institut des Neurosciences Neurologie, maladies neuro-musculaires [Hôpital de la Timone - APHM] Laboratoire Parole et Langage Laboratoire Parole et Langage University Hospital of Cologne [Cologne] Heinrich Heine Universität Düsseldorf = Heinrich Heine University [Düsseldorf] Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein University Hospital of Cologne [Cologne] University Hospital of Cologne [Cologne] University Hospital of Cologne [Cologne] University Hospital of Cologne [Cologne] Freie Universität Berlin = Free University of Berlin Freie Universität Berlin = Free University of Berlin [GIN] Grenoble Institut des Neurosciences [GIN] Grenoble Institut des Neurosciences [GIN] Grenoble Institut des Neurosciences Toulouse NeuroImaging Center Département Neurologie [CHU Toulouse] Département Neurologie [CHU Toulouse] Toulouse NeuroImaging Center Toulouse NeuroImaging Center Département Neurologie [CHU Toulouse] Heinrich Heine Universität Düsseldorf = Heinrich Heine University [Düsseldorf] Heinrich Heine Universität Düsseldorf = Heinrich Heine University [Düsseldorf] CIC de Poitiers – Centre d'investigation clinique de Poitiers (CIC 1402) Service de neurologie [Rouen] Nutrition, inflammation et dysfonctionnement de l'axe intestin-cerveau Centre d’Investigation Clinique de Nantes Centre d’Investigation Clinique de Nantes Paracelsus-Elena-Klinik, Kassel, Germany. Paracelsus-Elena-Klinik, Kassel, Germany. Universitätsklinikum Tübingen = University Hospital of Tuebingen Universitätsklinikum Tübingen = University Hospital of Tuebingen Universitäts Klinikum Freiburg = University Medical Center Freiburg Neurologie, maladies neuro-musculaires [Hôpital de la Timone - APHM] Hôpital neurologique et neurochirurgical Pierre Wertheimer [CHU - HCL] Hôpital neurologique et neurochirurgical Pierre Wertheimer [CHU - HCL] CIC de Poitiers – Centre d'investigation clinique de Poitiers (CIC 1402) Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein
• Publié dans Movement Disorders le 31/10/2020

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Résumé : Background: The EARLYSTIM trial demonstrated for Parkinson ’ s disease patients with early motor complications that deep brain stimulation of the subthalamic nucleus (STN-DBS) and best medical treatment (BMT) was superior to BMT alone. Objective: This prospective, ancillary study on EARLYSTIM compared changes in blinded speech intelligibility assessment between STN-DBS and BMT over 2 years, and secondary outcomes included non-speech oral movements (maximum phonation time [MPT], oral diadochokinesis), physician- and patient-reported assessments. Methods: STN-DBS (n = 102) and BMT (n = 99) groups underwent assessments on/off medication at baseline and 24 months (in four conditions: on/off medication, ON/OFF stimulation — for STN-DBS). Words and sentences were randomly presented to blinded listeners, and speech intelligibility rate was measured. Statistical analyses compared changes between the STN-DBS and BMT groups from baseline to 24 months. Results: Over the 2-year period, changes in speech intelligibility and MPT, as well as patient-reported outcomes, were not different between groups, either off or on medication or OFF or ON stimulation, but most outcomes showed a nonsignificant trend toward worsening in both groups. Change in oral diadochokinesis was significantly different between STN-DBS and BMT groups, on medi- cation and OFF STN-DBS, with patients in the STN-DBS group performing slightly worse than patients under BMT only. A signal for clinical worsening with STN-DBS was found for the individual speech item of the Unified Parkinson’ s Disease Rating Scale, Part III. Conclusion: At this early stage of the patients ’ disease, STN-DBS did not result in a consistent deterioration in blinded speech intelligibility assessment and patient-reported communication, as observed in studies of advanced Parkinson’ s Disease.

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Fichiers liés : Movement Disorders - 2023 Pinto.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Aiste LengvenyteRobertas StrumilaRaoul BelzeauxBruno AouizerateCaroline DubertretEmmanuel HaffenPierre-Michel LlorcaPaul RouxMircea PolosanRaymund SchwanMichel WalterThierry A. d'AmatoDominique JanuelMarion LeboyerFrank BellivierBruno EtainAlvydas NavickasÉmilie OliéPhilippe Courtet
• Organismes : Centre Hospitalier Régional Universitaire [Montpellier] Institut de Génomique Fonctionnelle Vilnius University [Vilnius] Fondation FondaMental [Créteil] Centre Hospitalier Régional Universitaire [Montpellier] Institut de Génomique Fonctionnelle Vilnius University [Vilnius] Institut de Neurosciences de la Timone Fondation FondaMental [Créteil] Assistance Publique - Hôpitaux de Marseille Institut de Génomique Fonctionnelle Nutrition et Neurobiologie intégrée Centre hospitalier Charles Perrens [Bordeaux] Fondation FondaMental [Créteil] Fondation FondaMental [Créteil] Institut de psychiatrie et neurosciences de Paris Hôpital Louis Mourier - AP-HP [Colombes] Fondation FondaMental [Créteil] Centre d'Investigation Clinique de Besançon Université Bourgogne Franche-Comté [COMUE] Fondation FondaMental [Créteil] CHU Clermont-Ferrand Université Clermont Auvergne Fondation FondaMental [Créteil] Centre Hospitalier de Versailles André Mignot Centre de recherche en épidémiologie et santé des populations [GIN] Grenoble Institut des Neurosciences CHU de Grenoble-Alpes - Centre Hospitalier Universitaire CHU Grenoble Fondation FondaMental [Créteil] Imagerie Adaptative Diagnostique et Interventionnelle Fondation FondaMental [Créteil] Centre Psychothérapique de Nancy [Laxou] Fondation FondaMental [Créteil] Hopital de Bohars - CHRU Brest Centre de recherche en neurosciences de Lyon - Lyon Neuroscience Research Center Fondation FondaMental [Créteil] Etablissement public de santé de Ville-Evrard [Neuilly-sur-Marne] Fondation FondaMental [Créteil] Institut Mondor de Recherche Biomédicale Assistance publique - Hôpitaux de Paris (AP-HP) Fondation FondaMental [Créteil] CHU Henri Mondor [Créteil] Groupe Hospitalier Saint Louis - Lariboisière - Fernand Widal [AP-HP] Optimisation thérapeutique en Neuropsychopharmacologie Fondation FondaMental [Créteil] Fondation FondaMental [Créteil] Groupe Hospitalier Saint Louis - Lariboisière - Fernand Widal [AP-HP] Optimisation thérapeutique en Neuropsychopharmacologie Vilnius University [Vilnius] Centre Hospitalier Régional Universitaire [Montpellier] Institut de Génomique Fonctionnelle Fondation FondaMental [Créteil] Centre Hospitalier Régional Universitaire [Montpellier] Institut de Génomique Fonctionnelle Fondation FondaMental [Créteil]
• Publié dans Brain, Behavior, and Immunity le 29/10/2020

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Résumé : Evidences suggest that inflammation is increased in a subgroup of patients with depression. Moreover, increased peripheral inflammatory markers (cells and proteins) are associated with some, but not all depressive symptoms. On the other hand, similar studies on bipolar disorders mainly focused on blood cytokines. Here, we analysed data from a large (N = 3440), well-characterized cohort of individuals with bipolar disorder using Kendall partial rank correlation, multivariate linear regression, and network analyses to determine whether peripheral blood cell counts are associated with depression severity, its symptoms, and dimensions. Based on the self-reported 16-Item Quick Inventory of Depressive Symptomatology questionnaire scores, we preselected symptom dimensions based on literature and data-driven principal component analysis. We found that the counts of all blood cell types were only marginally associated with depression severity. Conversely, white blood cell count was significantly associated with the sickness dimension and its four components (anhedonia, slowing down, fatigue, and appetite loss). Platelet count was associated with the insomnia/restlessness dimension and its components (initial, middle, late insomnia and restlessness). Principal component analyses corroborated these results. Platelet count was also associated with suicidal ideation. In analyses stratified by sex, the white blood cell count-sickness dimension association remained significant only in men, and the platelet count-insomnia/restlessness dimension association only in women. Without implying causation, these results suggest that peripheral blood cell counts might be associated with different depressive symptoms in individuals with bipolar disorder, and that white blood cells might be implicated in sickness symptoms and platelets in insomnia/agitation and suicidal ideation.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Léa MerioJohan ChanalMarie JachietValérie PourcherJean Philippe ArnaultChristelle JouhetBrigitte Milpied-HomsiIsabelle Bourgault-VilladaFrancois AubinFrédéric CauxSébastien FouéréÉric VicautMarie Beylot-BarryOlivier Chosidow
• Organismes : Institut Cochin Institut Pierre Louis d'Epidémiologie et de Santé Publique CHU Pitié-Salpêtrière [AP-HP] Service de dermatologie [CHU d'Amiens-Picardie] Centre Hospitalier Universitaire de Bordeaux Institut Cochin Department of Dermatology Service de dermatologie [Avicenne] Hopital Saint-Louis [AP-HP] Paris-Centre de Recherche Cardiovasculaire Groupe Hospitalier Saint Louis - Lariboisière - Fernand Widal [AP-HP] Centre d'Investigation Clinique Henri Mondor
• Publié dans Journal of the European Academy of Dermatology and Venereology le 27/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Aurelie LeboyanFlorence EsselinAnne‐laure BascouClaire DuflosIoana IonMahmoud CharifGiovanni CastelnovoClarisse Carra DallièreXavier AyrignacPhilippe KerschenMohamed ChbichebLudovic NguyenAlexandre MariaPhilippe GuilpainMathilde CarriereNicolas Menjot de ChampfleurThierry VincentAlexandre JentzerPierre LabaugeJérôme J. DevauxGuillaume Taieb
• Organismes : Centre Hospitalier Régional Universitaire [Montpellier] Centre Hospitalier Régional Universitaire [Montpellier] Centre Hospitalier Régional Universitaire [Montpellier] Centre Hospitalier Régional Universitaire [Montpellier] Hôpital Universitaire Carémeau [Nîmes] Centre Hospitalier Régional Universitaire [Montpellier] Hôpital Universitaire Carémeau [Nîmes] Centre Hospitalier Régional Universitaire [Montpellier] Centre Hospitalier Régional Universitaire [Montpellier] Centre Hospitalier de Luxembourg [Luxembourg] Centre Hospitalier de Narbonne Centre Hospitalier Saint Jean de Perpignan Hôpital Saint Eloi [CHU Montpellier] Hôpital Saint Eloi [CHU Montpellier] Centre Hospitalier Régional Universitaire [Montpellier] Centre Hospitalier Régional Universitaire [Montpellier] Hôpital Saint Eloi [CHU Montpellier] Hôpital Saint Eloi [CHU Montpellier] Centre Hospitalier Régional Universitaire [Montpellier] Institut de Génomique Fonctionnelle Centre Hospitalier Régional Universitaire [Montpellier] Institut de Génomique Fonctionnelle
• Publié dans European Journal of Neurology le 22/10/2020

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Résumé : Background and purpose: In addition to combined central and peripheral demyelination, other immune diseases could involve both the central nervous system (CNS) and peripheral nervous system (PNS). Methods: To identify immune-mediated diseases responsible for symptomatic combined central/peripheral nervous system involvement (ICCPs), we conducted a multicentric retrospective study and assessed clinical, electrophysiological, and radiological features of patients fulfilling our ICCP criteria. Results: Thirty patients (20 males) were included and followed during a median of 79.5 months (interquartile range [IQR] = 43-145). The median age at onset was 51.5 years (IQR = 39-58). Patients were assigned to one of four groups: (i) monophasic disease with concomitant CNS/PNS involvement including anti-GQ1b syndrome (acute polyradiculoneuropathy + rhombencephalitis, n = 2), checkpoint inhibitor-related toxicities (acute polyradiculoneuropathy + encephalitis, n = 3), and anti-glial fibrillary acidic protein astrocytopathy (subacute polyradiculoneuropathy and meningoencephalomyelitis with linear gadolinium enhancements, n = 2); (ii) chronic course with concomitant CNS/PNS involvement including paraneoplastic syndromes (ganglionopathy/peripheral hyperexcitability + limbic encephalitis, n = 4); (iii) chronic course with sequential CNS/PNS involvement including POEMS (polyneuropathy, organomegaly, endocrinopathy, monoclonal protein, skin changes) syndrome (polyradiculoneuropathy + strokes, n = 2), histiocytosis (polyradiculoneuropathy + lepto-/pachymeningitis, n = 1), and systemic vasculitis (multineuropathy + CNS vasculitis/pachymeningitis, n = 2); and (iv) chronic course with concomitant or sequential CNS/PNS involvement including combined central and peripheral demyelination (polyradiculoneuropathy + CNS demyelinating lesions, n = 10) and connective tissue diseases (ganglionopathy/radiculopathy/multineuropathy + limbic encephalitis/transverse myelitis/stroke, n = 4). Conclusions: We diagnosed nine ICCPs. The timing of central and peripheral manifestations and the disease course help determine the underlying immune disease. When antibody against neuroglial antigen is identified, CNS and PNS involvement is systematically concomitant, suggesting a common CNS/PNS antigen and a simultaneous disruption of blood-nerve and blood-brain barriers.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Abigail PickardJean-Pierre ThibautKaat PhilippeJérémie Lafraire
• Organismes : Institut Lyfe Research & Innovation Centre (ex-Institut Paul Bocuse Research Centre) Laboratoire d'Etude de l'Apprentissage et du Développement [Dijon] Laboratoire d'Etude de l'Apprentissage et du Développement [Dijon] Centre des Sciences du Goût et de l'Alimentation [Dijon] Université Bourgogne Franche-Comté [COMUE] Institut Lyfe Research & Innovation Centre (ex-Institut Paul Bocuse Research Centre)
• Publié dans Journal of Experimental Child Psychology le 25/10/2020

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Résumé : Previous research established that children with poorer taxonomic knowledge in the food domain display increased levels of food rejection. However, the food domain heavily lends itself to script and thematic conceptual knowledge (e.g., pancakes at breakfast), to which young children already attend. This series of studies investigated the development of conceptual knowledge, specifically in the food domain, and the link with food rejection. Study 1 used a nonconflicting triad task testing children’s knowledge of four subtypes of script and thematic associations (food–food pairs, food–utensil pairs, event scripts, and meal scripts) with children aged 3–6 years living in the United States (18 males and 14 females). Study 2 employed the same design along with a measure of food rejection in 3- to 6-year-olds living in France (67 males and 62 females). There was significant conceptual development in both groups, but thematic food concepts are acquired earlier than meal script concepts. Study 3 investigated the link between thematic and script cross-classification and food rejection in 39 females and 33 males living in France (4- to 7-year-olds). Results demonstrate that children as young as 3 years old are already attending to thematic and script structures to inform food-based decision making. Even more critically, Study 3 showed that increased food rejection tendencies are negatively related to script and thematic understanding in the food domain. Such seminal studies illustrate the importance of conceptual knowledge in children’s interpretation and acceptance of food, highlighting promising avenues for knowledge-based interventions to foster dietary variety.

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Fichiers liés : pickard_2023_vol226_105546_j_exp_child_psychol.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Anaïs MartinMathilde OyallonJean Philippe PerrinThomas DurandLaurent DeumierPierre CorreStéphane RenaudinHélios Bertin
• Organismes : Centre Hospitalier Universitaire de Nantes = Nantes University Hospital Centre Hospitalier Universitaire de Nantes = Nantes University Hospital Service de Chirurgie maxillo-faciale et stomatologie Service de Chirurgie maxillo-faciale et stomatologie Service de Chirurgie maxillo-faciale et stomatologie Service de Chirurgie maxillo-faciale et stomatologie Regenerative Medicine and Skeleton Centre Hospitalier Universitaire de Nantes = Nantes University Hospital Service de Chirurgie maxillo-faciale et stomatologie Centre de Recherche en Cancérologie et Immunologie Intégrée Nantes-Angers
• Publié dans Journal of Stomatology, Oral and Maxillofacial Surgery le 25/10/2020

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Résumé : Introduction Surgically assisted rapid maxillary expansion (SARME) with a dental-anchorage appliance can induce dental and skeletal complications adjacent to the teeth supporting the device. The purpose of this study was to quantify the dentoskeletal changes observed after SARME using a tooth-borne device. Materials and methods Cone beam CT images from 39 patients were compared between the preoperative (T1) and the postoperative period (T2). The mean time to complete the second imaging was 13.8 ± 6.9 months after the SARME. Dental and bone parameters were assessed: the vestibular bone height (BH), the bone thickness (BT), the existence of fenestrations, and the root resorption at the level of first upper premolar (P1) and the first upper molar (M1). The maxillary expansion parameters were also collected. Results Both vertical and horizontal vestibular bone loss were observed mainly in the first upper molar sectors: The BT decreased from 0.93 ± 0.50 mm to 0.53 ± 0.51 mm (p < 0.0001) and the BH decreased from 1.84 ± 1.05 mm to 0.93 ± 1.02 mm (p < 0.0001) for tooth #16. The bone loss also affected the first upper premolars but in a more limited manner. Significant fenestrations were observed at the apex of the mesio-vestibular root of teeth #16 and #26. We noted significant root resorption affecting the mesio-, disto-vestibular and palatal roots of tooth #16 (mean reductions of 0.32, 0.35, and 0.55 mm, respectively; p < 0.05), and the palatal root of tooth # 26 (loss of 0.58 mm; p = 0.004). The mean bone expansion was 3.76 mm and 1.41 mm at the premolar and molar levels, respectively (p < 0.0001), while a mean 6.24 mm and 4.23 mm inter-cuspid expansion was noted at the P1 and M1 levels (p < 0.0001). Conclusion Our results document the vestibular bone changes and low root resorption, mostly in the molar sectors, associated with SARME using dental-anchorage devices.

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Fichiers liés : Journal of Stomatology.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Josefina LingM. ScardiaJean-Louis PrieurL. PansecchiR. ArgyleEric AristidiA. ZanuttaLouis AbbePhilippe BendjoyaJean-Pierre RivetDavid VernetLuca Maccarini
• Organismes : Universidade de Santiago de Compostela [España] = University of Santiago de Compostela [Spain] = Université de Saint-Jacques-de-Compostelle [Espagne] INAF - Osservatorio Astronomico di Brera Institut de recherche en astrophysique et planétologie INAF - Osservatorio Astronomico di Brera Laboratoire Hippolyte Fizeau Université Nice Sophia Antipolis (1965 - 2019) Observatoire de la Côte d'Azur
• Publié dans Information Circular - IAU Commission G1 Double Stars le 09/11/2019

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Fichiers liés : cir209.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/02/2023
• Auteurs : Huan WangWigneron J.-P.Philippe CiaisYitong YaoLei FanXiangzhuo LiuXiaojun LiJulia GreenFeng TianShengli TaoWei LiFrédéric FrappartClément AlbergelMengjia WangShuangcheng Li
• Organismes : College of Urban and Environmental Sciences [Beijing] Interactions Sol Plante Atmosphère Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Interactions Sol Plante Atmosphère Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China Interactions Sol Plante Atmosphère Interactions Sol Plante Atmosphère Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Department of Environmental Science, Policy, and Management [Berkeley] School of Remote Sensing and Information Engineering, Wuhan University College of Urban and Environmental Sciences [Beijing] Department of Earth System Science [Beijing] Interactions Sol Plante Atmosphère European Centre for Space Applications and Telecommunications Zhengzhou University College of Urban and Environmental Sciences [Beijing]
• Publié dans Remote Sensing of Environment le 28/10/2020

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Résumé : Vegetation optical depth (VOD) is seasonally sensitive to plant water content and aboveground biomass. This index has a strong penetrability within the vegetation canopy and is less impacted by atmosphere aerosol contamination effects, clouds and sun illumination than optical vegetation indices. VOD is thus increasingly applied in ecological applications, e.g., carbon stock, phenology and vegetation monitoring. However, VOD retrieval over dense forests is subject to uncertainties caused by the thick canopy and complex multiple scattering effects. Thus, a comprehensive evaluation of VOD products over dense forests is needed for effective and accurate applications. This study evaluated the seasonal variations of eight recently developed/reprocessed VOD products at different frequencies (e.g., Ku-, X-, C- and L-band) over Amazon intact forests, supported by the ORCHIDEE-CAN-NHA model-simulated vegetation water content. Furthermore, we also explored the potential causes of VOD retrieval issues, in terms of retrieval algorithm uncertainties. We first confirmed that soil water availability dominated seasonal dynamics of vegetation water content over Amazon intact forests. This was verified by model-simulated vegetation water content and by C-band radar backscatter observations. Generally, evening or midday vegetation water content shows higher correlations with soil moisture than morning or midnight vegetation water content. In terms of ability of morning or midnight VOD products to follow the seasonality of soil moisture, active microwave ASCAT-IB C-VOD (median seasonal correlation with soil moisture (R) ∼ 0.50) outperforms the passive microwave VOD products, followed by passive microwave AMSR2 X-VOD (R ∼ 0.26) and VODCA X-VOD (R ∼ 0.16). However, SMOS-IC L-VOD (R ∼ −0.15) and AMSR2 C1-VOD (R ∼ −0.20) show obviously negative seasonal correlations with soil moisture across most pixels. This implausible behavior is likely to be caused by the inappropriate setting of time-invariant scattering effects in the passive microwave VOD retrieval algorithms, which could lead to an overestimation of the VOD amplitude during dry seasons. Thus, we recommend that the seasonal scattering effects be considered in the passive microwave VOD retrieval algorithms. These findings can contribute to the improvement of VOD retrieval algorithms and help with the development of their ecological applications over Amazon dense forests.

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Fichiers liés : 1-s2.0-S0034425722005156-am.pdf

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