5 research outputs found
Devenir des apports terrigÚnes autour du Grand Nouméa (Décembre 2016 - Avril 2017)
Dans lâobjectif de mieux caractĂ©riser le devenir en mer des apports terrigĂšnes autour de la ville de NoumĂ©a, Nouvelle-CalĂ©donie, notamment suite au passage de dĂ©pressions et cyclones tropicaux, diffĂ©rents rĂ©seaux dâobservation routiniers (GOPS, MĂ©tĂ©o-France, DAVAR) ont Ă©tĂ© complĂ©tĂ©s par lâinstallation dâinstruments au niveau des exutoires marins de la DumbĂ©a et la CoulĂ©e, et par la rĂ©alisation rĂ©pĂ©tĂ©e de profils hydrologiques (CTD) sur la zone cĂŽtiĂšre dâintĂ©rĂȘt. Lâobjectif de ce rapport est de restituer et commenter les observations collectĂ©es. Le contexte mĂ©tĂ©o-ocĂ©anique et les observations rĂ©alisĂ©es sont dâabord exposĂ©s sur lâensemble de la pĂ©riode Ă©tudiĂ©e, qui court du 1er dĂ©cembre 2016 au 30 avril 2017. Les consĂ©quences du passage du cyclone Cook sur les paramĂštres physico-chimiques du lagon sont ensuite dĂ©crites pour la pĂ©riode du 10 au 19 avril 2017. Les surcotes, les vagues, la tempĂ©rature, la salinitĂ© et la turbiditĂ© sont prĂ©sentĂ©es en particulier, en diffĂ©rents endroits du lagon, et mises en relation avec les paramĂštres atmosphĂ©riques (pression, vent, prĂ©cipitations) et hydrologiques (dĂ©bits des riviĂšres). Sur toute la pĂ©riode dâĂ©tude, les vagues et les surcotes observĂ©es sont restĂ©es dâamplitude modĂ©rĂ©e. Lâimpact des dĂ©pressions sur la tempĂ©rature a Ă©tĂ© relativement faible et localisĂ© proche des cĂŽtes alors que la salinitĂ© et la turbiditĂ© ont Ă©voluĂ© rapidement sous leur action, mĂȘme sur des zones situĂ©es relativement au large des cĂŽtes. Ces rĂ©sultats suggĂšrent que les phĂ©nomĂšnes dĂ©pressionnaires, et particuliĂšrement les cyclones, sont susceptibles de modifier substantiellement les masses dâeaux lagonaires bien au-delĂ des zones impactĂ©es par les apports terrigĂšnes par temps calm
Rapport de mesures dans le lagon de HienghÚne-Touho - Province Nord - Nouvelle-Calédonie. SPHYNX - Suivi des Paysages HYdrologiques des lagons Nord
Ce rapport fait partie du projet de recherche PRESENCE (PRessions sur les EcosysteÌmes reÌcifaux et lagonaires de Nouvelle-CaleÌdoniE). L'objectif de ce projet est de mieux appreÌhender le fonctionnement des lagons de Nouvelle-CaleÌdonie aÌ partir dâobservations in-situ, de teÌleÌdeÌtection et de modeÌlisation hydrodynamique. Ce rapport preÌsente les mesures effectueÌes sur les lagons de Touho aÌ PoueÌbo situeÌs sur la coÌte Est de la Province Nord de Nouvelle-CaleÌdonie, secteur sur lequel les connaissances et observations du fonctionnement hydrodynamique eÌtaient assez parcellaires. Les donneÌes seront utiliseÌes par la suite pour mieux appreÌhender la dynamique de ce grand lagon mais eÌgalement aÌ des fins de calibration et de validation de modeÌle hydrodynamique
Hydrodynamic and hydrological processes within a variety of coral reef lagoons: Field observations during 6 cyclonic seasons in New Caledonia
Abstract. From 2014 to 2021, extensive monitoring of hydrodynamics was deployed within a variety of lagoons of New Caledonia during 6 tropical cyclone seasons. Globally, those coastal physical observations encompassed five different lagoons (four of which were never monitored before) and at least eight major atmospheric events ranging from tropical depression to category 4 cyclone. The main objectives were to characterize the processes at stake controlling hydrodynamics and hydrology of these lagoons (e.g ocean-lagoon exchanges, circulation, level dynamics, temperature and salinity variability) and capture their magnitude of change during extreme events. An additional objective was to build an adequate data set for assessment of high-resolution hydrodynamics models. Those field experiments took place within the PRESENCE project (PRESsures on coral Ecosystems of New CalEdonia) which aimed at building an efficient representation of the land-lagoon-ocean continuum of Grande Terre (main land) lagoons. Autonomous oceanographic instruments were moored at strategic locations to collect time-series of temperature, salinity, pressure, eulerian currents which characterize hydrodynamics at best. During field trips, whenever possible, lagrangian drifters releases and cross-shore hydrological profiles radials were additionally carried out. Surveys begun chronologically with SPHYNX campaign which lasted 15 months (December 2014 to February 2016) in the HienghĂšne-Touho lagoon followed with 5 months records in NOUMEA lagoon (December 2016 to April 2017). ELADE campaign in Poe lagoon encompassed 2 periods of measure (February to April 2018 and June to August 2018). In Koumac lagoon, CADHYAK survey was carried out between December 2019 until the end of May 2020 and finally, data have been recorded continuously for 9 months in Moindou lagoon (NEMO) (September 2020 to April 2021). In addition to characterize these lagoons, this data set stresses out some important features and processes, such as the presence of internal waves on reef slopes, wave-driven fluxes over reef barrier and exchanges through passes. It also contains the signatures of strong events materialized by surges, thermal drops inside lagoons or massive flash flood plumes dispersion. Raw data sets were processed, quality-controlled and validated, and processed files are publicly available in dedicated repositories on Seanoe in NetCDF format. Links (DOI) of individual data sets are provided herein
Transgenic expression of CTLA4-Ig by fetal pig neurons for xenotransplantation
International audienc
Caractérisation des formes autosomiques récessives de la maladie de Parkinson dans une large cohorte multi-centrique
International audienceStudies of the phenotype and population distribution of rare genetic forms of parkinsonism are required, now that geneâtargeting approaches for Parkinson disease have reached the clinical trial stage. We evaluated the frequencies of PRKN, PINK1, and DJâ1 mutations in a cohort of 1,587 cases. Mutations were found in 14.1% of patients; 27.6% were familial and 8% were isolated. PRKN was the gene most frequently mutated in Caucasians, whereas PINK1 mutations predominated in ArabâBerber individuals. Patients with PRKN mutations had an earlier age at onset, and less asymmetry, levodopaâinduced motor complications, dysautonomia, and dementia than those without mutation