Publications scientifiques

Precise and stable measurements of sea level are critical for understanding long-term climate trends. This study investigates the stability of sea level measurements using tide gauges and GNSS-based instruments at the Corsica calibration site. The calibration and validation of satellite altimetry missions require an uncertainty of ± 0.3 mm/yr at a global scale and ± 1 mm/yr at a regional scale. The study also evaluates the vertical land motion (VLM) of the reference GNSS site (RG00) and its impact on long-term sea level trends.

The grounding zones (GZ) of marine‐terminating glaciers, where ice transitions from grounded to floating, experience strong mechanical changes in response to ocean tides. The spatial and temporal dynamics of these changes remain poorly documented, as they require multi‐scale observations capable of resolving internal ice deformation. Here, we use seismic observations, collected across different years and various scales, coupled with GNSS observations, to evaluate the brittle deformation at the GZ and shear margins of the Astrolabe Glacier (East Antarctica, Terre Adélie).

Brest and Marseille tide gauges time series between 1885 and 2022 data gaps are filled with data from neighboring tide gauges thanks to a combination model that does not alter original trends. Continuous relative sea level time series obtained from this step are then corrected from the inverse barometer effect and/or periodic components. Time series are systematically explored to form all possible sub-time series, from 20 years length to the full time span, and adjusted with linear and quadratic fits.

A FEM model of Shallow Wave Equations (SWE-FEM) is studied, taking into account the variable bathymetry of semi-enclosed sea basins. The model, with a spatially varying Coriolis term, is implemented for the description of combined refraction–diffraction effects, from which the eigenperiods and eigenmodes of extended geographical sea areas are calculated by means of a low-order FEM scheme. The model is applied to the western Mediterranean basin, illustrating its versatility to easily include the effects of geographical characteristics like islands and other coastal features.

Intertidal marshes are important habitats for nekton. However, historical draining and dyking hampered European coastal wetlands. Marsh restoration is therefore critical not only to improve their capacity to protect coastal lines but also to rehabilitate their ecological functionalities. The benefits of intertidal marsh restoration for nekton community composition and feeding ecology are examined in a case study within the largest macrotidal estuary in Western Europe (Gironde).

The Regions Of Freshwater Influence (ROFIs) are defined as the area on the continental shelf in the vicinity of estuaries, where freshwater from the river significantly influence water properties and circulation. These regions are subject to a variety of dynamic forcings, including tides, winds and river runoffs, which exhibit considerable variability. The objective of this study is to identify the dominant time scales of variability of the three major ROFIs (Seine, Loire, and Gironde) of the French continental shelf and their evolution over the last two decades.

The COAST-HF_Marel-Iroise station is a scientific floating platform in the Ifremer in situ test site of Sainte Anne du Portzic equipped with various sensors to monitor the local metocean conditions (Trasch Martin, 2023). It provides a rich array of input data for field campaign on mooring line tension of this station, both with and without the presence of biofouling.

Le marégraphe de Marseille est à la fois le bâtiment et l'appareil d'observation du niveau de la mer qu'il abrite. Créé en 1885 pour déterminer le niveau moyen de la mer formant l'origine des altitudes continentales françaises, il observe le niveau de la mer depuis cette époque. Classé monument historique et désormais complété d'instruments géophysiques modernes, il forme un observatoire dédié à la géodésie et aux sciences du changement climatique.