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4. Generation of 3-D synthetic data for the modeling of the CONSERT experiment (the radiotomography of comet 67P/Churyumov--Gerasimenko)

Author

Benna, Medhi, Barriot, Jean-Pierre, Kofman, Wlodek, and Barbin, Yves

Subjects
Antennas (Electronics) -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper presents a 3-D simulation of the COmet Nucleus Sounding Experiment by Radiowave Propagation (CONSERT) radiotomography experiment of the comet 67P/Churyumov-Gerasimenko. This experiment is part of the ROSETTA space mission, due to launch in 2004. Our simulation is based on a ray tracing algorithm and takes into account multiple internal reflections, power losses, phase delays and polarization distortions. We emulate as closely as possible the true CONSERT data and discuss the results of the simulation. Index Terms--Electromagnetic propagation in nonhomogeneous media, electromagnetic tomography, ray tracing.

Published
2004

6. Surface hydrodynamics of the Alderney Race from HF Radar Measurements

Author

Lopez, Guiomar, Bennis, Anne-Claire, Barbin, Yves, Laurent, Benoit, Cambra, Rémi, Conley, Daniel, Marié, Louis, Perez, Laurent, Sentchev, Alexei, Wyatt, Lucy, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), France Energies Marines [Brest], Plymouth University, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord]), School of Mathematics and Statistics [Sheffield] (SoMaS), University of Sheffield [Sheffield], Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS), and School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, UK

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract

International audience

Published
2019

7. Evaluating HF radar measurements at a highly energetic site

Author

Lopez, Guiomar, Bennis, Anne-Claire, Barbin, Yves, Benoit, Laurent, Cambra, Rémi, Conley, Daniel, Marié, Louis, Sentchev, Alexei, Wyatt, Lucy, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), France Energies Marines [Brest], Plymouth University, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord]), University of Sheffield [Sheffield], School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, UK, Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

8. HF Radar measurements at the Alderney Race

Author

Lopez, Guiomar, Bennis, Anne-Claire, Barbin, Yves, Benoit, Laurent, Cambra, Rémi, Conley, Daniel, Marié, Louis, Sentchev, Alexei, Wyatt, Lucy, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), France Energies Marines [Brest], Plymouth University, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord]), University of Sheffield [Sheffield], School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, UK, Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

9. An HF bi-phase shift keying radar: application to ice sounding in Western Alps and Spitsbergen Glaciers

Author

Nicollin, Florence, Barbin, Yves, Kofman, Wlodek, Mathieu, Daniel, Hamran, Svein-Erik, Bauer, Pierre, Achache, Jose, and Blamont, Jacques

Subjects
Ground penetrating radar -- Research, Pulse modulation (Electronics) -- Analysis, Echo sounding -- Research, Business, Earth sciences, Electronics and electrical industries
Abstract

A low frequency ground penetrating radar, developed for martian subsurface sounding (Mars 96 Mission) is presented. During the preliminary campaigns, its performances have been studied by ice thickness determination on various glaciers. This radar is a pulse-compression system designed in order to limit the necessary peak power. It involves the phase modulation of the transmitted pulse by coded sequences. By moving the radar along a profile on the surface, a continuous section of the reflected energy associated with dielectric permitivity contrasts is obtained. The technique of modulation of the transmitted pulse and matched filtering of the received signal provides a significant depth penetration while preserving a satisfactory range resolution. This processing is efficient even if the echo is partially shortened or if the signal is modified by differential attenuation. A multichannel filtering, based on the spectral properties of the signal is then applied to the section. This method is shown to provide the enhancement of the signature of deep continuous reflectors by signal-to-noise ratio (SNR) improvement. Experimental results of ice sounding on glaciers in the French Western Alps and at Spitsbergen are presented; after processing the profiles show, in particular, that the ice-bedrock interface can be identified at depths between 30 and 120 m.

Published
1992

10. Hydrodynamics of Raz Blanchard: HF radar wave measurements

Author

Lopez, Guiomar, Bennis, Anne-Claire, Barbin, Yves, Benoît, Laurent, Cambra, Rémi, Conley, Daniel, Lagarde, Jean-Louis, Marié, Louis, Perez, Laurent, Smet, Sébastien, Wyatt, Lucy, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), France Energies Marines [Brest], Plymouth University, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Actimar (Actimar) (Actimar), University of Sheffield [Sheffield], Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), School of Biological and Marine Sciences, University of Plymouth, Plymouth PL4 8AA, UK, Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), and Bennis, Anne-Claire

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

11. Hydrodynamics of the Alderney Race: HF Radar Wave Measurements

Author

Lopez, Guiomar, Bennis, Anne-Claire, Barbin, Yves, Benoit, Laurent, Cambra, Rémi, Conley, Daniel, Helzel, Thomas, Lagarde, Jean-Louis, Marie, Louis, Perez, Laurent, Smet, Sébastien, Wyatt, Lucy, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), France Energies Marines [Brest], School of Biological Sciences [Plymouth], Plymouth University, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Actimar (Actimar) (Actimar), School of Mathematics and Statistics [Sheffield] (SoMaS), University of Sheffield [Sheffield], Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), and Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)

Subjects
surface current, HF radar, Alderney Race, sea state, tidal energy, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract

International audience; In this contribution we present the first wave measurements collected with a HF radar installed at the north-west coast of France to overlook a promising area for tidal energy extraction. The radar measurements are aimed to help understanding the oceanographic conditions at the site, aid the validation and improvement of numerical models, and ultimately the calculation of tidal stream energy. The results show good agreement when compared against ADCP measurements, especially when the current speed is below 1 m.s-1. The latter appears to have a clear influence not only on the quality of the radar’s wave results, but also on their spatial extent.

Published
2018

12. Hydrodynamics of Raz Blanchard : HF Radar Measurements

Author

Lopez, Guiomar, Bennis, Anne-Claire, Barbin, Yves, Benoit, Laurent, Cambra, Rémi, Conley, Daniel, Helzel, Thomas, Lagarde, Jean-Louis, Marié, Louis, Smet, Sébastien, Wyatt, Lucy, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), France Energies Marines [Brest], School of Biological Sciences [Plymouth], Plymouth University, Laboratoire d'Océanographie Physique et Spatiale (LOPS), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Actimar (Actimar) (Actimar), School of Mathematics and Statistics [Sheffield] (SoMaS), University of Sheffield [Sheffield], Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)

Subjects
ComputingMilieux_MISCELLANEOUS, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract

International audience

Published
2018

13. Wind-induced variability in the Northern Current (northwestern Mediterranean Sea) as depicted by a multi-platform observing system

Author

Berta, Maristella, primary, Bellomo, Lucio, additional, Griffa, Annalisa, additional, Magaldi, Marcello G., additional, Molcard, Anne, additional, Mantovani, Carlo, additional, Gasparini, Gian Pietro, additional, Marmain, Julien, additional, Vetrano, Anna, additional, Béguery, Laurent, additional, Borghini, Mireno, additional, Barbin, Yves, additional, Gaggelli, Joel, additional, and Quentin, Céline, additional

Published
2018
Full Text
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14. Wind induced variability in the Northern Current (North-Western Mediterranean Sea) as depicted by a multi-platform observing system

Author

Berta, Maristella, primary, Bellomo, Lucio, additional, Griffa, Annalisa, additional, Magaldi, Marcello, additional, Molcard, Anne, additional, Mantovani, Carlo, additional, Gasparini, Gian Pietro, additional, Marmain, Julien, additional, Vetrano, Anna, additional, Béguery, Laurent, additional, Borghini, Mireno, additional, Barbin, Yves, additional, Gaggelli, Joel, additional, and Quentin, Céline, additional

Published
2018
Full Text
View/download PDF

16. High Frequency Surface Wave Radar in the French Mediterranean Sea: an element of the Mediterranean Ocean Observing System for the Environment

Author

Quentin, Céline Gwenaëlle, Barbin, Yves, Bellomo, Lucio, Forget, Philippe, Mallarino, Didier, Marmain, Julien, Molcard, A., Zakardjian, Bruno, Institut méditerranéen d'océanologie (MIO), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Aix Marseille Université (AMU)-Institut de Recherche pour le Développement (IRD), Institut Pythéas (OSU PYTHEAS), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut de Recherche pour le Développement (IRD), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Coastal Observing System, High Frequency Surface Wave Radar, North Western Mediterranean Sea, Northern Current
Abstract

International audience; A Mediterranean Ocean Observing System for the Environment (MOOSE) has been set up as an interactive, distributed, and integrated observatory system of the North West Mediterranean Sea in order to detect and identify long-term environmental anomalies. In this framework, the Mediterranean Institute of Oceanography (MIO) operates two couple of High Frequency Surface Wave Radars (HFSWR). HFSWRs provide synoptic observations of sea surface currents with high temporal (0.25-1 h) and spatial (1-3 km) resolution and long range (30-100 km). They can therefore be used to study the variability of the current as well as eddy dynamics. One site, based on the WERA (Helzel Messtechnik) technology and installed near Toulon, is operational and monitored in real-time since more than 3 years. It is composed of two WERA systems featuring respectively a non-linear receiving array and a full bistatic configuration, both working in Direction Finding mode. The second site, intended to extend further East the coverage of the Observatory, was set up in 2014 near Nice with two SeaSonde (Codar) systems. We present here an overview of the HFSWR network, the surface current mapping facility offered by the system, and recent observational results and applications.

Published
2014

17. Courantologie de surface: un radio-phare sur la côte sud de Porquerolles

Author

Barbin, Yves, Bellomo, Lucio, Forget, Philippe, Quentin, Céline Gwenaëlle, and Pin, Thierry

Subjects
[SDE.MCG] Environmental Sciences/Global Changes, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, [INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment, [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

Grace au soutien du Parc National de Port-Cros, un radio-phare, en fait un petit émetteur d'ondes radioélectriques décimétriques dite "HF", fonctionne depuis le mois de mai 202 sur la côte sud de l'ile de Porquerolles.

Published
2014

18. Empirical forecasting of HF-radar velocity using genetic algorithms

Author

Orfila, Alejandro, Molcard, Anne, Sayol, Juan Manuel, Marmain, Julien, Bellomo, Lucio, Quentin, Celine, Barbin, Yves, Orfila, Alejandro, Molcard, Anne, Sayol, Juan Manuel, Marmain, Julien, Bellomo, Lucio, Quentin, Celine, and Barbin, Yves

Abstract

© 1980-2012 IEEE. We present a coastal ocean current forecasting system using exclusively past observations of a high-frequency radar (HF-Radar). The forecast is made by developing a new approach based on physical and mathematical results of the nonlinear dynamical systems theory that allows to obtain a predictive equation for the currents. Using radial velocities from two HF-Radar stations, the spatiotemporal variability of the fields is first decomposed using the empirical orthogonal functions. The amplitudes of the most relevant modes representing their temporal evolution are then approximated with functions obtained through a genetic algorithm. These functions will be then combined to obtain the hourly currents at the area for the next 36 h. The results indicate that after 4 h and for a horizon of 24 h, the computed predictions provide more accurate current fields than the latest available field (i.e., persistent field).

Published
2015

19. HF radar in French Mediterranean Sea: an element of MOOSE Mediterranean Ocean Observing System on Environment

Author

Quentin, Céline Gwenaëlle, Barbin, Yves, Bellomo, Lucio, Forget, Philippe, Gagelli, Joël, Grosdidier, Samuel, Guérin, Charles-Antoine, Guihou, Karen, Marmain, Julien, Molcard, A., Zakardjian, Bruno, Guterman, Pascal, Bernardet, Karim, OPLC, Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Division technique INSU/SDU (DTI), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]
Abstract

International audience; In the framework of the French MOOSE project (Mediterranean Ocean Observing System on Environment), the Mediterranean Institute of Oceanography is operating HF radars on the North Western Mediterranean coast. The surface circulation in this region is characterized by a large-scale flow (Northern Current) and by a broad range of other scales of variability induced by meteorological and tidal forcing. The ability of HF radars is to provide synoptic observation as sea surface current map every hour and over long distances. One site is already operational nearby Toulon for more than two years and a second one is in deployment around Nice. This paper gives an overview of the radars network, of the surface current mapping facility offered by the system, and of recent observation results and applications.

Published
2013

20. Substances naturelles en Polynésie française

Author

Barbin, Yves, Beauvais, Marie-Laure, Boisvert, Valérie, Cabalion, Pierre, Debitus, Cécile, Florence, Jacques, Fourasté, Isabelle, Guezennec, Jean, Moretti, Christian, Noiville, Christine, Simon, Jean-Christophe, Weniger, Bernard, Guezennec, Jean, Moretti, Christian, and Simon, Jean-Christophe

Subjects
BUS072000, RNU, plante, commercialisation, stratégie de recherche, Polynésie française, Environmental Studies, ressources halieutiques, archipel, île, exploitation des ressources naturelles
Abstract

Développer l’utilisation durable des substances naturelles, faire de la protection de la biodiversité une activité rentable pour mieux la promouvoir tout en favorisant le développement des territoires concernés : il y a là, dans le contexte actuel, des enjeux importants pour la Polynésie française. En effet, la Polynésie française bénéficie d’un potentiel intéressant par sa diversité (marine et terrestre) et ses spécificités, liées notamment à l’insularité. C’est ce qu’atteste le succès de quelques-uns de ses produits mondialement connus : perles, monoï, jus de nono, vanille. Mais la mise en valeur de ce potentiel demeure encore limitée ; son inventaire lui-même reste très partiel. Pour en préciser les dimensions réelles, cette expertise collégiale s’est attachée à évaluer scientifiquement la ressource, tout en mettant en évidence les substances d’intérêt et les orientations de recherche prioritaires. Les conditions socio-économiques, juridiques et techniques de la mise en valeur de cette ressource sont analysées ici aux fins de fournir des éléments de connaissance et des recommandations utiles à la définition par la Polynésie d’une politique originale de valorisation de ses substances naturelles. A major challenge for French Polynesia in the present situation is to develop sustainable use of natural substances, make the protection of biodiversity a profitable activity to better promote it, while at the same time furthering the development of the territories concerned. French Polynesia possesses a wide diversity of marine and terrestrial species, largely because the territory consists of many scattered islands. Such diversity represents a valuable potential, as illustrated by the success of such world-famous products as Polynesian pearls and vanilla, monoi and noni juice. However, the potential has not so far been exploited to any great extent, and has not even been fully catalogued. This expert group review was designed to discover the extent of the potential, make a scientific assessment of the resource, pinpoint substances with economic potential and indicate priority directions for research. It also includes analysis of the socio-economic, legal and technical conditions for their utilisation. This purpose of the review is to supply useful facts and make recommendations for defining an original policy for French Polynesia’s economic use of natural substances.

Published
2013

21. Surface circulation in the Iroise Sea (western Brittany) derived from high resolution current mapping by HF radars

Author

Sentchev, Alexei, Forget, Philippe, Barbin, Yves, Yaremchuk, Max, Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS), and Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Nord])

Subjects
Physics::Atmospheric and Oceanic Physics, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Abstract

International audience; The data from two high-frequency radars (HFR) operating in the Iroise Sea are re-processed by applying an improved version of the direction finding algorithm, removing wave-induced surface currents and the variational interpolation on a regular grid. Combining these processing techniques allowed reconstruction of the surface currents at a level of details that was not previously available. Refined resolution enabled to identify fine-scale structures of surface circulation, to quantify the variability of tidal currents and the residual (time averaged) velocity field, and to explain spatial intermittence in polarization of the tidal current ellipses. The analyzed data span two month-long periods in spring and late summer of 2007. The major findings include (a) a dipole structure in the vorticity field characterized by two oppositely rotating eddies, generated on the leeward side of the Ushant Island at flood (negative polarity) and at ebb (positive polarity); (b) an extremely strong fortnightly variability of tidal currents northwest of the Ushant Island with the highest velocity magnitude of 3.9 m/s caused by the interference of the major semi-diurnal tidal constituents; (c) a significant contribution of the higher order nonlinear tidal harmonics to the surface currents in the Fromveur strait, which maintains strong tidal currents and affects the shape of their fortnightly modulation. The residual circulation is characterized by two distinct zones approximately separated by the 100 m isobath: in the offshore zone the residual currents have a significant contribution of the wind-driven component, whereas the nearshore zone is characterized by extremely strong (up to 0.4 m/s) time-independent residual circulation featuring two permanent anticyclonic eddies: north of the western extremity of the Sein archipelago, and north the Ushant Island. The acquired data and the presented results could be useful for regional model validation and studies of the local eddy dynamics, tidal fronts, and passive tracer transport in the region.

Published
2013

22. Wind induced variability in the Northern Current (North-Western Mediterranean Sea) as depicted by a multi-platform observing system.

Author

Berta, Maristella, Bellomo, Lucio, Griffa, Annalisa, Magaldi, Marcello, Molcard, Anne, Mantovani, Carlo, Gasparini, Gian Pietro, Marmain, Julien, Vetrano, Anna, Béguery, Laurent, Borghini, Mireno, Barbin, Yves, Gaggelli, Joel, and Quentin, Céline

Subjects
GEOSTROPHIC currents, UPWELLING (Oceanography), OCEAN currents
Abstract

The variability and evolution of the Northern Current (NC) in the area off Toulon is studied for two weeks in December 2011 using data from a glider, a HF radar network, vessel surveys, a meteo station, and an atmospheric model. The NC variability is dominated by a synoptic response to wind events, even though a seasonal trend is also observed, transitioning from late summer to fall-winter conditions. With weak winds the current is mostly zonal and in geostrophic balance even at the surface, with a zonal transport associated to the NC of ≈ 1 Sv. Strong westerly wind events (longer than 2-3 days) induce an interplay between the direct wind induced ageostrophic response and the geostrophic component: upwelling is observed, with offshore surface transport, surface cooling, flattening of the isopycnals and reduced zonal geostrophic transport (0.5-0.7 Sv). The sea surface response to wind events, as observed by the HF radar, shows total currents rotated at ≈ -55° to -90° to the right of the wind. Performing a decomposition between geostrophic and geostrophic components of the surface currents, the wind driven ageostrophic component is found to rotate of ≈ -25° to -30° to the right of the wind. The ageostrophic component magnitude corresponds to ≈ 2 % of the wind speed. [ABSTRACT FROM AUTHOR]

Published
2018
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23. Monitoring the NW current in front of the Golden islands

Author

Barbin, Yves, Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Pin, Thierry

Subjects
traitement azimtal à haute résolution, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, configuration Bistatique, Radar Haute Fréquence, Propagation, courants de surface, Oceanographie, Radio Oceanographie
Abstract

International audience; The North West Mediterranean current plays an important role in the environnemental variability along the french riviera. A dedicated long term HF radar campaign has been settled along the "côte varoise". The presence of the islands is discussed, as well as original radar configuration.

Published
2012

24. High Resolution Surface Currents Mapping using Direction Finding Method in Bistatic Radar Configuration

Author

Barbin, Yves, Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Pin, Thierry

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Bistatic radar, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, HF radar, Doppler spectrum, Direction Finding, Sea surface currents
Abstract

International audience; The association of the Direction Finding Method with the Bistatic Radar Configuration is discussed and compared to the standard Monostaic configuration and to the classical beam forming method. It is shown that for current mapping, this combination may give bettre coverage than any other configuration. Some results from a short campaign are shown

Published
2011

25. Quality Assessment of Commercial Magnoliae Officinalis Cortex by 1H-NMR-based Metabolomics and HPLC Methods

Author

Yong, Jiang, VAYSSE, Julie, Gilard, Véronique, BALAYSSAC, Stéphane, Dejean, Sébastien, Malet-Martino, Myriam, DAVID, Bruno, Fiorini, Christel, Barbin, Yves, Synthèse et Physico-Chimie de Molécules d'Intérêt Biologique (SPCMIB), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Institut de Mathématiques de Toulouse UMR5219 (IMT), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

26. Properties of the 67P/Churyumov-Gerasimenko interior revealed by CONSERT radar

Author

Kofman, Wlodek, primary, Herique, Alain, additional, Barbin, Yves, additional, Barriot, Jean-Pierre, additional, Ciarletti, Valérie, additional, Clifford, Stephen, additional, Edenhofer, Peter, additional, Elachi, Charles, additional, Eyraud, Christelle, additional, Goutail, Jean-Pierre, additional, Heggy, Essam, additional, Jorda, Laurent, additional, Lasue, Jérémie, additional, Levasseur-Regourd, Anny-Chantal, additional, Nielsen, Erling, additional, Pasquero, Pierre, additional, Preusker, Frank, additional, Puget, Pascal, additional, Plettemeier, Dirk, additional, Rogez, Yves, additional, Sierks, Holger, additional, Statz, Christoph, additional, Svedhem, Hakan, additional, Williams, Iwan, additional, Zine, Sonia, additional, and Van Zyl, Jakob, additional

Published
2015
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28. High Resolution Azimutal Radial Current Mapping with Multisource Capability

Author

Barbin, Yves, Broche, Pierre, Forget, Philippe, Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Pin, Thierry

Subjects
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing, [SDU.STU.OC] Sciences of the Universe [physics]/Earth Sciences/Oceanography, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; Avec un radar HF, le signal retrodiffusé par la mer a une signature doppler caractéristique dont on peut extraire l'effet du courant radial de surface. Mais la mer se comporte comme une source distribuée. Pourtant, en traitant le spectre discrètement (raie par raie), les méthodes HR à sources discrètes peuvent être utilisées pour dresser de manière pertinente des cartes du courant à condition d'en maîtriser la paramétrisation

Published
2009

29. Monitoring of surface ocean circulation in the Gulf of Lions 5north West Mediterranean Sea) using Wera HF radars

Author

Forget, Philippe, Barbin, Yves, Andre, G., Pin, Thierry, Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET), and Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
courants de surfaces, radar HF, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing, circulation, [SDU.STU.OC] Sciences of the Universe [physics]/Earth Sciences/Oceanography, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Océanographie, [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; La mesure continue sur une périodes de presque deux ans (juin 2005- février 2007) des courants de surface sur le Golf du Lion permet une étude de la circulation et de ces variations.

Published
2008

30. Prism, the Ground Penetrating Radar for the Mars Balloon Mission

Author

Barbin, Yves, Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN), Institut National Polytechnique de Grenoble - INPG, Kofman, W., Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Barbin, Yves

Subjects
Mars planet, instrument embarqué, space born instrument, traitement du signal, radar de sondage de la subsurface, planète Mars, compatibilité électromagnétique, antenne, electronic device, antenna, [SDU.OTHER] Sciences of the Universe [physics]/Other, électronique, signal processing, [SDU.OTHER]Sciences of the Universe [physics]/Other, ground penetrating radar, electromagnetic compatibility
Abstract

The Mars96 mission towards plante Mars was to deliver an atmospheris balloon whose metallic guiderope contained a ground penetrating radar that was to sound the planet subsurface up to a one kilometre depth. The Mars96 balloon mission was postponed and then cancelled. This document presents and discusses most of the features of this new radar instrument. Some specific and original parts are described with more details. The performance evaluation, the matching of the instrument to the signals dynamics, and the evaluation of the available data amount build the last chapter of this dissertation., La mission spatiale internationale Mars96 devait emporter vers la planète rouge un aérostat développé en France par le CNES. Le guiderope métallique de cet aérostat devait contenir un radar de sondage de la subsurface jusqu'au kilomètre de profondeur. La mission du ballon sur Mars96 a été reportée puis annulée. Ce mémoire présente et discute l'essentiel des développements de ce nouvel instrument radar, certaines parties spécifiques et originales sont détaillées. L'évaluation de performance, l'étude de la dynamique des signaux avec adaptation de l 'instrument, et l'évaluation de la quantité d'information disponible terminent ce mémoire.

Published
1996

32. Surface Circulation in the Iroise Sea (W. Brittany) from High Resolution HF Radar Mapping

Author

NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV, Sentchev, Alexei, Forget, Phillippe, Barbin, Yves, Yaremchuk, Max, NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV, Sentchev, Alexei, Forget, Phillippe, Barbin, Yves, and Yaremchuk, Max

Abstract

The data from two high-frequency radars (HFR) operating in the Iroise Sea are re-processed by applying an improved version of the direction finding algorithm, removing wave-induced surface currents and the variational interpolation on a regular grid. Combining these processing techniques allowed reconstruction of the surface currents at a level of details that was not previously available. Refined resolution enabled to identify fine-scale structures of surface circulation, to quantify the variability of tidal currents and the residual (time averaged) velocity field, and to explain spatial intermittence in polarization of the tidal current ellipses. The analyzed data span two month-long periods in spring and late summer of 2007. The major findings include (a) a dipole structure in the vorticity field characterized by two oppositely rotating eddies, generated on the leeward side of the Ushant Island at flood (negative polarity) and at ebb (positive polarity); (b) an extremely strong fortnightly variability of tidal currents northwest of the Ushant Island with the highest velocity magnitude of 3.9 m/s caused by the interference of the major semi-diurnal tidal constituents; (c) a significant contribution of the higher order nonlinear tidal harmonics to the surface currents in the Fromveur strait, which maintains strong tidal currents and affects the shape of their fortnightly modulation. The residual circulation is characterized by two distinct zones approximately separated by the 100 m isobath: in the offshore zone the residual currents have a significant contribution of the wind-driven component, whereas the nearshore zone is characterized by extremely strong (up to 0.4 m/s) time-independent residual circulation featuring two permanent anticyclonic eddies: north of the western extremity of the Sein archipelago, and north the Ushant Island. The acquired data and the presented results could be useful for regional model validation and studies of the local eddy dynamics, Published in the Journal of Marine Systems, v109-110 pS153 S168, 2013. Prepared in cooperation with the Laboratoire d'Oc anologie et G osciences, Universit du Littoral-C te d'Opale, Wimereux, France, and the Laboratoire de Sondages Electromagnetiques de l'Environnement Terrestre, Universit du Sud Toulon Var, La Garde, France.

Published
2013

35. Quality Assessment of Commercial Magnoliae Officinalis Cortex by 1H-NMR-based Metabolomics and HPLC Methods.

Author

Jiang, Yong, Vaysse, Julie, Gilard, Véronique, Balayssac, Stéphane, Déjean, Sébastien, Malet-Martino, Myriam, David, Bruno, Fiorini, Christel, and Barbin, Yves

Abstract

ABSTRACT Introduction The quality control of Magnoliae officinalis Cortex, a commonly used traditional Chinese medicine, is currently based on the assay of the two active compounds, honokiol and magnolol, by TLC or HPLC. Objective To compare 1H-NMR-based metabolomics with the HPLC method for controlling the quality of Magnoliae officinalis Cortex. To identify the metabolites contributing to the differences between the samples and to discriminate different medicinal parts and geographic origins of these samples by 1H-NMR-based metabolomics. Methodology 1H-NMR and several multivariate analysis techniques were applied to analyse the extracts of 18 batches of Magnoliae officinalis Cortex commercial samples, and the contents of honokiol and magnolol in these samples were determined by HPLC. The correlation analysis between the data from 1H-NMR and HPLC was performed with the mixOmics software based on an unsupervised method. Results Honokiol and magnolol were the main compounds responsible for the discrimination of samples from different batches, thus proving that the choice of these two compounds as markers for quality assessment by HPLC is relevant. The two sources of Magnoliae officinalis Cortex recorded in the Chinese Pharmacopoeia, Magnolia officinalis and Magnolia officinalis var. biloba, could be differentiated from 1H-NMR data, but the pattern recognition analysis by PLS-DA was unsuccessful in discriminating samples from various geographical origins. Conclusion The combination of 1H-NMR that gives a comprehensive profile of the metabolites and HPLC that targets two biomarkers is an efficient means for a better quality control of Magnoliae officinalis Cortex. Copyright © 2011 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2012
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36. Starfish saponins : 26

Author

Riccio, R., Iorizzi, M., Squillage-Greco, O., Minale, L., Laurent, Dominique, and Barbin, Yves

Subjects
EXTRACTION, SAPONINE, IDENTIFICATION, SUBSTANCE NATURELLE, ANALYSE SPECTRALE, ANALYSE STRUCTURALE, ETOILE DE MER
Published
1985

38. Suppressing Radio Frequency Interference in HF Radars.

Author

Gurgel, Klaus-Werner and Barbin, Yves

Subjects
RADIO frequency, INTERFERENCE (Sound), RADAR, DETECTORS, FREQUENCIES of oscillating systems
Abstract

The article discusses a four-step method to reduce the impact of radio frequency interference (RFI) from high-frequency radar. The first two steps aim to avoid RFI whenever possible, select the cleanest frequency bands for operation and scan for the best operating frequency prior to running each measurement cycle. The last two steps eliminate RFI appearing within a measurement cycle and spurious echoes received by the radar.

Published
2008

39. COMETARY SCIENCE. Properties of the 67P/Churyumov-Gerasimenko interior revealed by CONSERT radar.

Author

Kofman W, Herique A, Barbin Y, Barriot JP, Ciarletti V, Clifford S, Edenhofer P, Elachi C, Eyraud C, Goutail JP, Heggy E, Jorda L, Lasue J, Levasseur-Regourd AC, Nielsen E, Pasquero P, Preusker F, Puget P, Plettemeier D, Rogez Y, Sierks H, Statz C, Svedhem H, Williams I, Zine S, and Van Zyl J

Abstract

The Philae lander provides a unique opportunity to investigate the internal structure of a comet nucleus, providing information about its formation and evolution in the early solar system. We present Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT) measurements of the interior of Comet 67P/Churyumov-Gerasimenko. From the propagation time and form of the signals, the upper part of the "head" of 67P is fairly homogeneous on a spatial scale of tens of meters. CONSERT also reduced the size of the uncertainty of Philae's final landing site down to approximately 21 by 34 square meters. The average permittivity is about 1.27, suggesting that this region has a volumetric dust/ice ratio of 0.4 to 2.6 and a porosity of 75 to 85%. The dust component may be comparable to that of carbonaceous chondrites., (Copyright © 2015, American Association for the Advancement of Science.)

Published
2015
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40. Quality assessment of commercial Magnoliae officinalis Cortex by ¹H-NMR-based metabolomics and HPLC methods.

Author

Jiang Y, Vaysse J, Gilard V, Balayssac S, Déjean S, Malet-Martino M, David B, Fiorini C, and Barbin Y

Subjects
Biphenyl Compounds chemistry, China, Drugs, Chinese Herbal analysis, Drugs, Chinese Herbal chemistry, Ecosystem, Lignans chemistry, Metabolome, Multivariate Analysis, Quality Control, Sensitivity and Specificity, Chromatography, High Pressure Liquid methods, Magnetic Resonance Spectroscopy methods, Magnolia chemistry, Metabolomics methods, Software
Abstract

Introduction: The quality control of Magnoliae officinalis Cortex, a commonly used traditional Chinese medicine, is currently based on the assay of the two active compounds, honokiol and magnolol, by TLC or HPLC., Objective: To compare ¹H-NMR-based metabolomics with the HPLC method for controlling the quality of Magnoliae officinalis Cortex. To identify the metabolites contributing to the differences between the samples and to discriminate different medicinal parts and geographic origins of these samples by ¹H-NMR-based metabolomics., Methodology: ¹H-NMR and several multivariate analysis techniques were applied to analyse the extracts of 18 batches of Magnoliae officinalis Cortex commercial samples, and the contents of honokiol and magnolol in these samples were determined by HPLC. The correlation analysis between the data from ¹H-NMR and HPLC was performed with the mixOmics software based on an unsupervised method., Results: Honokiol and magnolol were the main compounds responsible for the discrimination of samples from different batches, thus proving that the choice of these two compounds as markers for quality assessment by HPLC is relevant. The two sources of Magnoliae officinalis Cortex recorded in the Chinese Pharmacopoeia, Magnolia officinalis and Magnolia officinalis var. biloba, could be differentiated from ¹H-NMR data, but the pattern recognition analysis by PLS-DA was unsuccessful in discriminating samples from various geographical origins., Conclusion: The combination of ¹H-NMR that gives a comprehensive profile of the metabolites and HPLC that targets two biomarkers is an efficient means for a better quality control of Magnoliae officinalis Cortex., (Copyright © 2011 John Wiley & Sons, Ltd.)

Published
2012
Full Text
View/download PDF

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