Publications scientifiques

Cette page liste les productions scientifiques ou autres liées notamment à l'observation du niveau de la mer, à l'instrumentation ou aux applications.

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Diet of Haplognathia ruberrima (Gnathostomulida) in a Caribbean marine mangrove

Haplognathia ruberrima is a cosmopolitan gnathostomulid species found in sulfur bacterial mats in mangroves in Guadeloupe (French West Indies). Haplognathia ruberrima presents a δ13C value lower than all measured meiofaunal grazers and lower than the available measured food sources of this environment. This low δ13C value can not be due to specific ingestion of 13C-depleted methanogenic bacteria because abundances of those bacteria are reduced in surficial and deep sediments as revealed by δ13C of bacterial fatty acid.
  • Article scientifique

P.-Y. Pascal, C. Bellemare, W. Sterrer, H. T. S. Boschker, S. Gonzalez-Rizzo, O. Gros
Marine Ecology, volume 36
 Scanning electron microscope analysis of Haplognathia ruberrima individuals freshly collected from marine mangrove. (A): In low magnification, the entire body surface of the individuals analysed presented this general aspect. (B and C): The general aspect is due to the presence of numerous long filaments individually attached to the body surface of the animal. (D): Higher magnification reveals these filaments to be long cilia that are likely responsible for the gliding movement observed in H. ruberrima ind

Regional circulation around New Caledonia from two decades of observations

The regional and near-coastal circulation around New Caledonia is investigated using a compilation of more than 20 years of observations. Velocity profiles acquired by Shipboard Acoustic Doppler Current Profiler (SADCP) during 109 research cruises and ship transits since 1991 are analyzed and compared with absolute geostrophic currents inferred from hydrographic profiles and Argo floats drifts. In addition, altimetric surface currents are used to explore the variability of the circulation at various timescales.
  • Article scientifique

S. Cravatte, E. Kestenare, G. Eldin, A. Ganachaud, J. Lefèvre, F. Marin, C. Menkes, J. Aucan
Journal of Marine Systems, volume 148
Journal of Marine Systems

A new hybrid model for filling gaps and forecast in sea level: application to the eastern English Channel and the North Atlantic Sea (western France)

This research is carried out in the framework of the program Surface Water and Ocean Topography (SWOT) which is a partnership between NASA and CNES. Here, a new hybrid model is implemented for filling gaps and forecasting the hourly sea level variability by combining classical harmonic analyses to high statistical methods to reproduce the deterministic and stochastic processes, respectively.
  • Article scientifique

I. Turki, B. Laignel, N. Kakeh, L. Chevalier, S. Costa
Ocean Dynamics, volume 65
Sea level components at studied stations: the astronomical tides AT(t) (grey points), the residual surges S(t) (white line), and the component SL(t) −MSLV (black line)

Modélisation des niveaux marins extrêmes associés à la circulation des cyclones Lenny (1999) et Omar (2008), commune de saint-pierre, littoral nord-ouest de la Martinique

Les submersions marines sont le plus souvent associées à des conditions météorologiques locales de tempête et aux phénomènes bien connus de surcote résultant du cumul de l’effet barométrique inverse et des vents d'afflux. Le déferlement des vagues joue également un rôle prépondérant dans la surélévation totale. Il provoque des variations du niveau d’eau de deux types : une surélévation statique du niveau moyen (surcote de vague) et des variations instantanées provoquées par le jet de rive. Ces deux phénomènes sont responsables dans certains cas de plus de 2/3 de la surélévation totale.
  • Article scientifique

A. N. Lerma, Y.-F. Thomas, P. Saffache, P. Durand, M. Lamy
Vertigo, volume 14
Localisation du site d'étude, modèles numériques de bathymétrie (MNB) et profils de plages

The contribution of short-waves in storm surges: Two case studies in the Bay of Biscay

This study investigates the contributions of short waves in storm surges through the hindcast of two storms that hit the central part of the Bay of Biscay recently. Despite displaying comparable wind speed and directions in the study area, these two storms induced different storm surges and sea states. Xynthia (27–28th of February 2010) was characterized by large (up to 7 m significant wave height Hs) and short-period waves and induced an exceptional storm surge, locally larger than 1.6 m.
  • Article scientifique

X. Bertin , K. Li, A. Roland, J.-R. Bidlot
Continental Shelf Research, volume 96
Continental Shelf Research

Fortnightly tidal asymmetry inversions and perspectives on sediment dynamics in a macrotidal estuary (Charente, France)

Tidal asymmetry is a phenomenon that characterises estuarine hydrodynamics and has a strong impact on sediment dynamics. Extensive research has been dedicated to studying tidal dynamics in semidiurnal macrotidal estuaries, highlighting several general principles. The ratio of flood to ebb peak velocities and differences in ebb and flood durations are often used to characterise the asymmetry encountered in estuaries.
  • Article scientifique

F. Toublanc, I. Brenon, T. Coulombier, O. Le Moine
Continental Shelf Research, volume 94
Continental Shelf Research

Levelling co-located GNSS and tide gauge stations using GNSS reflectometry

The GNSS reflectometry technique provides geometric information on the environment surrounding the GNSS antenna including the vertical distance to a reflecting surface. We use sea-surface reflections of GPS signals, recorded as oscillations in signal-to-noise ratio (SNR), to estimate the GNSS to tide gauge (TG) levelling tie, and thus the ellipsoidal heights of the TG. We develop approaches to isolate SNR data dominated by sea-surface reflections and to remove SNR frequency changes caused by the dynamic sea surface.
  • Article scientifique

A. Santamaría-Gómez, C. Watson, M. Gravelle, M. King, G. Wöppelmann
Journal of Geodesy, volume 89
Figure 8

GPS observation of geophysical deformations induced by non tidal loading

The temporal and spatial redistribution of the environmental masses deform the surface of the Earth. These deformations are observable by space geodetic techniques such as GNSS. Since highly accurate IGS satellite and clock data are available and sophisticated algorithms have been developped, the integer fixed ambiguity Precise Point Positioning (iPPP) method opened a new era for the Global Navigation Satellite System (GNSS) analysis and its application in geophysical studies.
  • Article scientifique

M. Ferenc
Laboratoire Géomatique et Foncier - Paris, CNAM
Image satellite du Xynthia. Source: NASA.

Trophic role of large benthic sulfur bacteria in mangrove sediment

Large filamentous sulfur-oxidizing bacteria belonging to the Beggiatoacae family can cover large portions of shallow marine sediments surrounding mangroves in Guadeloupe (French West Indies). In order to assess the importance of Beggiatoa mats as an infaunal food source, observations were conducted of the area within mats and at increasing distances from mats. We used natural isotopic compositions and a 13C enrichment study. Both revealed an ingestion of bacterial mats by associated meiofauna, dominated by rotifers and to a smaller extent by small polychaetes and nematodes.
  • Article scientifique

P.-Y. Pascal, S. Dubois, H. T. S. Boschker, O. Gros
Marine Ecology Progress Series, volume 516
Mats of white benthic filamentous sulfur bacteria between mangrove tree roots (water depth = 1 m)