Claire Dufau

Claire Dufau
Collecte Localisation Satellites | CLS · Environment & Climate

Ph.D

About

28
Publications
4,789
Reads
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811
Citations
Additional affiliations
January 2007 - February 2020
Collecte Localisation Satellites
Position
  • Group Leader
March 2004 - July 2006
Laboratoire d'Etudes en Géophysique et Óceanographie Spatiales
Position
  • PostDoc Position
Description
  • Data Assimilation in a 3D model of the Gulf of Lion Supervision :Pierre De Mey
February 2000 - February 2004
Laboratoire d'Aérologie
Position
  • PhD Student
Description
  • Realistic Numerical 3D modeling of the Gulf of Lions during the MOOGLI3 cruise

Publications

Publications (28)
Conference Paper
Full-text available
The problem of marine debris became a concern of world scientists that placed Indonesia as the second contributor of the world. Plastic litter that leaked from the land and came through the river is a major source of Indonesia marine debris. This marine debris is a serious threat for ocean and coastal ecosystems. The Ministry of Marine Affairs and...
Conference Paper
Full-text available
Plastic litter had become world major concerned since 2015 and Indonesia had been placed as the second contributor after China. Around 200,000 metric tons of plastic wastes discharged from Indonesia rivers mainly from Java and Sumatra Islands every year. This surge of waste then become a serious threat to ocean and coastal ecosystem, as well as mar...
Article
Full-text available
It is essential to monitor accurately current sea level changes to better understand and project future sea level rise (SLR). This is the basis to support the design of adaptation strategies to climate change. Altimeter sea level products are operationally produced and distributed by the E.U. Copernicus services dedicated to the marine environment...
Article
Full-text available
Coastal zones are highly dynamical systems affected by a variety of natural and anthropogenic forcing factors that include sea level rise, extreme events, local oceanic and atmospheric processes, ground subsidence, etc. However, so far, they remain poorly monitored on a global scale. To better understand changes affecting world coastal zones and to...
Article
Full-text available
Land-based coastal high-frequency (HF) radar systems provide operational measurements of coastal surface currents (within 1–3m depth) with high spatial (300m–10km) and temporal ( ≤ 1h) sampling resolutions, while the near-continuous altimetry missions provide information, from 1993 until today, on geostrophic currents in the global ocean with typic...
Poster
Full-text available
The combination of different measuring systems in overlapping areas has proven to be a suitable approach to improve ocean monitoring and operational forecasts. The synergy between HF radar and altimetry data, especially in coastal areas, is one example. This study is focused on the South East Bay of Biscay (SE-BoB), an area composed of a narrow she...
Article
Full-text available
Coastal HF radar systems provide operational measurements of coastal surface currents with high spatial (~ 1–5 km) and temporal (~ hourly) sampling resolution while the near continuous altimetry missions afford, from 1993 to nowadays, information of geostrophic currents in the global ocean with typical along-track and temporal sampling resolutions...
Article
Wavenumber spectra of along-track Sea Surface Height from the most recent satellite radar altimetry missions [Jason-2, Cryosat-2, and SARAL/Altika) are used to determine the size of ocean dynamical features observable with the present altimetry constellation. A global analysis of the along-track 1-D mesoscale resolution capability of the present-da...
Article
Full-text available
The European MyOcean project (http://www.myocean.eu.org) provides observations of the ocean dynamic topography from altimeter measurements. Three specific indicators have been developed, based on altimeter data only, in order to monitor the ocean state. The first ocean indicator observes the positive and negative phases of the ENSO events in the tr...
Article
Full-text available
The Congo River in Africa has the world's second highest annual mean daily freshwater discharge and is the second largest exporter of terrestrial organic carbon into the oceans. It annually discharges an average of 1,250 × 109 m3 of freshwater into the southeast Atlantic producing a vast fresh water plume, whose signature can be traced hundreds of...
Article
Full-text available
A large number of SLA observations at a high along track horizontal resolution are an important ingredient of the data assimilation in the Mediterranean Forecasting System (MFS). Recently, new higher-frequency SLA products have become available, and the atmospheric pressure forcing has been implemented in the numerical model used in the MFS data as...
Article
The study of mesoscale and submesoscale [hereafter (sub)mesoscale] hydrodynamic features is essential for understanding thermal and biogeochemical exchanges between coastal areas and the open ocean. In this context, a glider mission was conducted in August 2008, closely co-located and almost simultaneously launched with a JASON 2 altimetric pass, t...
Article
Full-text available
The Sea Level Thematic Assembly Centre from the MyOcean project provides observations of the ocean dynamic topography from altimeter measurements. In order to validate and best make use of the SLTAC products, the ocean state is being monitored through the analysis of ocean indicators based on altimeter data only. Three specific indicators have been...
Article
Near the coasts, satellite altimeter techniques are unfortunately limited by a growth of their error budget. This quality loss is due on one hand to the land contamination in the altimetric and the radiometric footprints until respectively 10km and 50km and on the other hand to inaccurate geophysical corrections (tides, high-frequency processes for...
Article
Full-text available
A large number of SLA observations at a high along track horizontal resolution are an important ingredient of the data assimilation in the Mediterranean Forecasting System (MFS). Recently new higher frequency SLA products have become available, and the atmospheric pressure forcing has been implemented in the numerical model used in the MFS data ass...
Article
Full-text available
The impact of the assimilation of MyOcean Sea Level Anomalies along track data on the analyses of the Sicily Channel Regional Model was studied. The numerical model has a resolution of 1/32° degrees and is capable to reproduce mesoscale and sub-mesoscale features. The impact of the SLA assimilation is studied by comparing a simulation (SIM, which d...
Article
Full-text available
The impact of the assimilation of MyOcean sea level anomalies along-track data on the analyses of the Sicily Channel Regional Model was studied. The numerical model has a resolution of 1/32 • degrees and is capable to repro-duce mesoscale and sub-mesoscale features. The impact of the SLA assimilation is studied by comparing a simulation (SIM, which...
Chapter
By providing a large number of sea surface height observations globally and continuously, satellite altimetry provides a key contribution to the study of the global ocean. In coastal oceans, however, the use of altimetry is not as mature as in the deep oceans, owing to a number of problems that are discussed in other chapters of this book. Given th...
Article
Since the launch of Topex-Poseidon in 1992, satellite altimetry has become one of the most essential elements of the Earth's observing system. Its global view of the ocean state has permitted numerous improvements in the environment understanding, particularly in the global monitoring of climate changes and ocean circulation. Near the coastlines wh...
Article
As part of Jason-2 project, CNES is conducting a study to improve altimeter products in coastal areas and inland waters. This 18-months-project named PISTACH for « Prototype Innovant de Système de Traitement pour les Applications Côtières et l'Hydrologie » is structured in three phases. In the first months of the project, a study of the user needs...
Article
As part of Jason-2 project, CNES is currently funding a dedicated study to improve satellite radar altimetry products over coastal areas and continental waters. The PISTACH (Prototype Innovant de Système de Traitement pour les Applications Côtières et l'Hydrologie) project is organized around 3 phases: *Phase 1: user needs and structure of coastal/...
Article
The circulation of the Gulf of Lion, a large continental shelf north of the western basin of the Mediterranean Sea, is complex and highly variable. During stratified conditions, unexpected barotropic eastward currents can be detected, mostly in the western part of the gulf. Care is given to retrieve inertial oscillations when necessary. The primiti...
Article
[1] The Gulf of Lion's hydrodynamics are investigated with a numerical simulation of the 1998–1999 winter, performed with a three-dimensional (3-D) free-surface model and real forcings. The model initial state derives from the large-scale outputs of the MOM (1/8°) using a specific initialization method. The model results are validated with an ocean...
Article
Full-text available
1] Hydrological and currentmeter observations were collected on the continental shelf and slope of the Gulf of Lion during the FETCH experiment (13 March to 15 April 1998). Results from the first part of the cruise, characterized by strong northern winds, are presented. The hydrological structures evidence well-mixed water masses on the eastern and...
Article
The 3D hydrodynamic coastal model Symphonie developed at Laboratoire d'Aerologie (Toulouse) is used to analyse the set of data collected during the French Moogli3 cruise (11-21 January 1999). This modelling uses a 3km horizontal grid spacing. At the free-surface, realistic forcings are applied: air-sea fluxes are calculated thanks to a bulk formula...

Projects

Project (1)
Project
The project aims at strengthening Indonesian institutions awareness and knowledge about marine pollution by plastics, in order to implement appropriate interventions. prevention and recommendation, through support to the monitoring and modelling of marine debris. Our intention is to propose a statistical view of possible sites for accumulation of plastics for different seasons and different nino/nina years. The statistical will be obtained by changing different parameters of numerical models and Lagrangian schemes and running realistic long simulation. Validate the models and hypothesis against in-situ data, including dedicated launch of drifters and microplastics cruise on a test case region, north of Java Island. The project will also include a series of in situ validation, both for Lagrangian trajectory in a specific site off the Java Coast and collect in-situ data for validation of the ocean model. The project will be shaped following 4 work packages including ocean numerical experiments, Lagrangian experiments, observations and capacity building and communication. This project is funded by the Agence Francaise de Developpement (AFD) in Indonesia.