AV

Arthur Vidard

Chercheur Inria
165
Documents
Affiliation actuelle
  • Mathematics and computing applied to oceanic and atmospheric flows (AIRSEA)

Présentation

Thèmes de recherche

Modélisation inverse pour l’environnement.
Plus particulièrement :

  • Problèmes inverses et assimilation de données pour l’océan : méthode variationnelle, interpolation optimale
  • Assimilation de données lagrangiennes et de séquences d’images : méthode adjointe, contrôle optimal, océanographie, météorologie.
  • Analyse de sensibilité variationnelle : méthodes adjointes
  • Contrôle de paramètres : contrôle optimal

Publications

Publications

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Comparison of ensemble assimilation methods in a hydrological model dedicated to agricultural best management practices

Emilie Rouzies , Claire Lauvernet , Arthur Vidard

Hydrology and Earth System Sciences, 2026, 30 (1), pp.1 - 21. ⟨10.5194/hess-30-1-2026⟩

Article dans une revue hal-05474792v1
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Improvements to the Met Office's global ocean–sea ice forecasting system including model and data assimilation changes

Davi Mignac , Jennifer Waters , Daniel J Lea , Matthew J Martin , James While et al.

Geoscientific Model Development, 2025, 18 (11), pp.3405-3425. ⟨10.5194/gmd-18-3405-2025⟩

Article dans une revue hal-05113966v1
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Introducing time parallelisation within data assimilation

Rishabh Bhatt , Laurent Debreu , Arthur Vidard

SIAM Journal on Scientific Computing, 2025, 47 (2), pp.B533-B557. ⟨10.1137/24M1651903⟩

Article dans une revue hal-03540480v3
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Impact of input forcings variability on the global sensitivity analysis of a hydrological model

Katarina Radišić , Claire Lauvernet , Arthur Vidard

Environmental Modelling and Software, 2025, 192, pp.106522. ⟨10.1016/j.envsoft.2025.106522⟩

Article dans une revue hal-04849856v2
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Global sensitivity analysis of the dynamics of a distributed hydrological model at the catchment scale

Katarina Radišić , Emilie Rouzies , Claire Lauvernet , Arthur Vidard

Socio-Environmental Systems Modelling, 2023, 5, pp.18570:1-17. ⟨10.18174/sesmo.18570⟩

Article dans une revue hal-03884443v2
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How is a global sensitivity analysis of a catchment-scale, distributed pesticide transfer model performed? Application to the PESHMELBA model

Emilie Rouzies , Claire Lauvernet , Bruno Sudret , Arthur Vidard

Geoscientific Model Development, 2023, 16 (11), pp.3137-3163. ⟨10.5194/gmd-16-3137-2023⟩

Article dans une revue hal-04303529v1

Assimilation of Images via Dictionary Learning-Based Sparsity Regularization Strategy: An Application for Retrieving Fluid Flows

Long Li , Jianwei Ma , Francois-Xavier Le Dimet , Arthur Vidard

IEEE Transactions on Geoscience and Remote Sensing, 2022, 60, pp.5907120:1-20. ⟨10.1109/TGRS.2021.3110799⟩

Article dans une revue hal-03534164v1
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Robust calibration of numerical models based on relative regret

Victor Trappler , Élise Arnaud , Arthur Vidard , Laurent Debreu

Journal of Computational Physics, 2021, 426, pp.109952:1-19. ⟨10.1016/j.jcp.2020.109952⟩

Article dans une revue hal-02464780v3
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Joint Estimation of Balanced Motions and Internal Tides From Future Wide‐Swath Altimetry

Florian Le Guillou , Noé Lahaye , Clément Ubelmann , Sammy Metref , Emmanuel Cosme et al.

Journal of Advances in Modeling Earth Systems, 2021, 13 (12), pp.e2021MS002613:1-17. ⟨10.1029/2021MS002613⟩

Article dans une revue hal-03517332v2
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Sea Turtles for Ocean Research and Monitoring: Overview and Initial Results of the STORM Project in the Southwest Indian Ocean

Olivier Bousquet , Mayeul Dalleau , Marion Bocquet , Philippe Gaspar , Soline Bielli et al.

Frontiers in Marine Science, 2020, 7, pp.594080:1-19. ⟨10.3389/fmars.2020.594080⟩

Article dans une revue hal-03199889v1
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Multiscale Representation of Observation Error Statistics in Data Assimilation

Vincent Chabot , Maëlle Nodet , Arthur Vidard

Sensors, 2020, 20 (5), pp.1-20. ⟨10.3390/s20051460⟩

Article dans une revue hal-02421699v2
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Synthesis of Ocean Observations Using Data Assimilation for Operational, Real-Time and Reanalysis Systems: A More Complete Picture of the State of the Ocean

Andrew W. Moore , Matthew J. Martin , Santha Akella , Hernan G. Arango , Magdalena Balmaseda et al.

Frontiers in Marine Science, 2019, 6 (90), pp.1-7. ⟨10.3389/fmars.2019.00090⟩

Article dans une revue hal-02421672v1
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Calibration of the Tranus Land Use Module: Optimisation-Based Algorithms, their Validation, and Parameter Selection by Statistical Model Selection

Thomas Capelle , Peter Sturm , Arthur Vidard , Brian Morton

Computers, Environment and Urban Systems, 2019, 77, pp.101146:1-13. ⟨10.1016/j.compenvurbsys.2017.04.009⟩

Article dans une revue hal-01519654v1
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Topological data assimilation using Wasserstein distance

Long Li , Arthur Vidard , François-Xavier Le Dimet , Jianwei Ma

Inverse Problems, 2019, 35 (1), pp.015006. ⟨10.1088/1361-6420/aae993⟩

Article dans une revue hal-01960206v1
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Optimal transport for variational data assimilation

Nelson Feyeux , Arthur Vidard , Maëlle Nodet

Nonlinear Processes in Geophysics, 2018, 25 (1), pp.55-66. ⟨10.5194/npg-25-55-2018⟩

Article dans une revue hal-01342193v2
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The EU-FP7 ERA-CLIM2 project contribution to advancing science and production of Earth-system climate reanalyses

Roberto Buizza , Stefan Brönnimann , Leopold Haimberger , Patrick Laloyaux , Matthew J. Martin et al.

Bulletin of the American Meteorological Society, 2018, 99 (5), pp.1003-1014. ⟨10.1175/BAMS-D-17-0199.1⟩

Article dans une revue hal-01661240v1
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Optimal solution error quantification in variational data assimilation involving imperfect models

Victor Shutyaev , Igor Gejadze , Arthur Vidard , Francois-Xavier Le Dimet

International Journal for Numerical Methods in Fluids, 2017, 83 (3), pp.276-290. ⟨10.1002/fld.4266⟩

Article dans une revue hal-01411666v1
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A level-set based image assimilation method: Potential applications for predicting the movement of oil spills

Long Li , François-Xavier Le Dimet , Jianwei Ma , Arthur Vidard

IEEE Transactions on Geoscience and Remote Sensing, 2017, 55 (11), pp.6330-6343. ⟨10.1109/TGRS.2017.2726013⟩

Article dans une revue hal-01411878v1
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Multigrid solvers and multigrid preconditioners for the solution of variational data assimilation problems

Laurent Debreu , Emilie Neveu , Ehouarn Simon , François-Xavier Le Dimet , Arthur Vidard

Quarterly Journal of the Royal Meteorological Society, 2016, 142 (694), pp.515-528. ⟨10.1002/qj.2676⟩

Article dans une revue hal-00874643v1

Incremental projection approach of regularization for inverse problems

Innocent Souopgui , Hans Emmanuel Ngodock , Arthur Vidard , François-Xavier Le Dimet

Applied Mathematics and Optimization, 2016, 74 (2), pp.303-324. ⟨10.1007/s00245-015-9315-3⟩

Article dans une revue hal-01205235v1
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On model error in variational data assimilation

Victor Shutyaev , Arthur Vidard , François-Xavier Le Dimet , Igor Gejadze

Russian Journal of Numerical Analysis and Mathematical Modelling, 2016, 31 (2), pp.105-113. ⟨10.1515/rnam-2016-0011⟩

Article dans une revue hal-01309018v1
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Formulating LUTI Calibration as an Optimisation Problem: Example of Tranus Shadow Price Estimation

Thomas Capelle , Peter Sturm , Arthur Vidard

Procedia Engineering, 2015, Toward integrated modelling of urban systems, 115, pp.12-20. ⟨10.1016/j.proeng.2015.07.349⟩

Article dans une revue hal-01237639v1
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Accounting for observation errors in image data assimilation

Vincent Chabot , Maëlle Nodet , Nicolas Papadakis , Arthur Vidard

Tellus A: Dynamic meteorology and oceanography, 2015, 67 (23629), pp.19. ⟨10.3402/tellusa.v67.23629⟩

Article dans une revue hal-00923735v3
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NEMOTAM: tangent and adjoint models for the ocean modelling platform NEMO

Arthur Vidard , Pierre-Antoine Bouttier , Franck Vigilant

Geoscientific Model Development, 2015, 8, pp.1245-1257. ⟨10.5194/gmd-8-1245-2015⟩

Article dans une revue insu-01164710v1
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Toward a data assimilation system for NEMO

Pierre-Antoine Bouttier , Eric Blayo , Jean-Michel Brankart , Pierre Brasseur , Emmanuel Cosme et al.

Mercator Ocean Quarterly Newsletter, 2012, 46, pp.24-30

Article dans une revue hal-00945600v1

Assimilation of Image Sequences in Numerical Models

Olivier Titaud , Arthur Vidard , Innocent Souopgui , François-Xavier Le Dimet

Tellus A: Dynamic meteorology and oceanography, 2010, 62 (1), pp.30-47. ⟨10.1111/j.1600-0870.2009.00416.x⟩

Article dans une revue inria-00391876v1
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Assimilation of altimeter data in the ECMWF ocean analysis system 3

Arthur Vidard , Magdalena Balmaseda , David P. Anderson

Monthly Weather Review, 2009, 137 (4), pp.1393-1408. ⟨10.1175/2008MWR2668.1⟩

Article dans une revue inria-00325685v1
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Models, Data and Images for Predicting the Evolution of Geophysical Fluids

François-Xavier Le Dimet , Innocent Souopgui , Olivier Titaud , Arthur Vidard

Acta Mathematica Vietnamica, 2009, 34 (1), pp.37-47

Article dans une revue inria-00326125v1
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The ECMWF Ocean Analysis System: ORA-S3

Magdalena Balmaseda , Arthur Vidard , David P. Anderson

Monthly Weather Review, 2008, 136 (8), pp.3018-3034. ⟨10.1175/2008MWR2433.1⟩

Article dans une revue inria-00182186v1
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A Multivariate Treatment of Bias for Sequential Data Assimilation: Application to the Tropical Oceans

Magdalena Balmaseda , Dick Dee , Arthur Vidard , David P. Anderson

Quarterly Journal of the Royal Meteorological Society, 2007, 133 (622), pp.167-179. ⟨10.1002/qj.12⟩

Article dans une revue inria-00176159v1
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Historical reconstruction of the Atlantic Meridional Overturning Circulation from the ECMWF operational ocean reanalysis

Magdalena Balmaseda , Gregory Smith , Keith Haines , David P. Anderson , Tim Palmer et al.

Geophysical Research Letters, 2007, 34 (23), pp.L23615. ⟨10.1029/2007GL031645⟩

Article dans une revue inria-00181739v1
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Impact of Ocean Observation Systems on Ocean Analysis and Seasonal Forecasts

Arthur Vidard , David P. Anderson , Magdalena Balmaseda

Monthly Weather Review, 2007, 135 (2), pp.409-429. ⟨10.1175/MWR3310.1⟩

Article dans une revue inria-00176154v1

Impact of ARGO on analyses of the global ocean

Magdalena Balmaseda , David P. Anderson , Arthur Vidard

Geophysical Research Letters, 2007, 34 (16), pp.L16605:1-6. ⟨10.1029/2007GL030452⟩

Article dans une revue istex inria-00181749v1

Tropical Atlantic SST prediction with coupled ocean-atmosphere GCMs

Tim Stockdale , Magdalena Balmaseda , Arthur Vidard

Journal of Climate, 2006, 19 (23), pp.6047-6061. ⟨10.1175/JCLI3947.1⟩

Article dans une revue hal-00171446v1

Salinity Assimilation Using S(T): Covariance Relationships

Keith Haines , J. D. Blower , Jean-Philippe Drécourt , C. Liu , Arthur Vidard et al.

Monthly Weather Review, 2006, 134 (3), pp.759--771

Article dans une revue inria-00325632v1

Multi-model multi-method multi-decadal ocean analyses from the ENACT project

Michael Davey , Matt Huddleston , Bruce Ingleby , Keith Haines , Pierre-Yves Le Traon et al.

Newsletter of the Climate Variability and Predictability Programme (CLIVAR), 2006, 11 (3), pp.22-25

Article dans une revue hal-00171445v1

Variational data analysis with control of the forecast bias

Arthur Vidard , Andrea Piacentini , François-Xavier Le Dimet

Tellus A: Dynamic meteorology and oceanography, 2004, 56 (3), pp.177--188. ⟨10.3402/tellusa.v56i3.14414⟩

Article dans une revue inria-00325592v1
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Determination of optimal nudging coefficients

Arthur Vidard , François-Xavier Le Dimet , Andrea Piacentini

Tellus A: Dynamic meteorology and oceanography, 2003, 55 (1), pp.1--15. ⟨10.3402/tellusa.v55i1.14576⟩

Article dans une revue inria-00325360v1
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4D Variational Data Analysis with Imperfect Model

Arthur Vidard , Eric Blayo , François-Xavier Le Dimet , Andrea Piacentini

Flow, Turbulence and Combustion, 2000, 65 (3), pp.489--504. ⟨10.1023/A:1011452303647⟩

Article dans une revue istex inria-00325356v1
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Variational methods

Maelle Nodet , Arthur Vidard

Handbook of Uncertainty Quantification, Springer International Publishing, pp.1-20, 2016, 978-3-319-11259-6. ⟨10.1007/978-3-319-11259-6_32-1⟩

Chapitre d'ouvrage hal-01251720v1
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Assimilation of Images

Arthur Vidard , Olivier Titaud

Eric Blayo; Marc Bocquet; Emmanuel Cosme; Leticia F. Cugliandolo. Advanced Data Assimilation for Geosciences, Oxford University Press, pp.20, 2014, Lecture Notes of the Les Houches Summer School, 9780198723844

Chapitre d'ouvrage hal-01099711v1

The ECMWF Perspective.

David P. Anderson , Magdalena Balmaseda , Arthur Vidard

E. Chassignet et J. Verron. Ocean Weather Forecasting. An Integrated View of Oceanography., Chapitre 13, Springer, 2006

Chapitre d'ouvrage inria-00325606v1

Reduced order strategies for variational data assimilation in oceanic models

Eric Blayo , Sophie Durbiano , Arthur Vidard , François-Xavier Le Dimet

Bruno Sportisse; François-Xavier Le Dimet. Data Assimilation for Geophysical Flows, Springer-Verlag, 2003

Chapitre d'ouvrage inria-00325368v1
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Assimilation de données et méthodes adjointes pour la géophysique

Arthur Vidard

Optimisation et contrôle [math.OC]. Université de Grenoble, 2012

HDR tel-00939130v1
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Poseidon: A Source-to-Source Translator for Holistic HPC Optimizations of Ocean Models on Regular Grids

Maurice Brémond , Hugo Brunie , Laurent Debreu , Rupert W Ford , Florian Lemarié et al.

SC 2024 - International Conference for High Performance Computing, Networking, Storage, and Analysis, Nov 2024, Atlanta (Georgia), United States. , pp.1-1, 2024, ⟨10.5281/zenodo.11190458⟩

Poster de conférence hal-04811677v1
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Consideration of uncertain forcings in the global sensitivity analysis and metamodeling of a pesticide transfer model

Katarina Radišić , Claire Lauvernet , Arthur Vidard

EGU General Assembly 2024, Apr 2024, Vienna, Austria, Austria. pp.1-1, 2024, ⟨10.5194/egusphere-egu24-19838⟩

Poster de conférence hal-04626611v1
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State-dependent Preconditioning for Data Assimilation

Victor Trappler , Arthur Vidard

2023 - 54th International Liège Colloquium on Ocean Dynamics : Machine Learning and Data Analysis in Oceanography, May 2023, Liège, Belgium. , pp.1-1

Poster de conférence hal-04087646v1
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State-dependent Preconditioning for Data Assimilation

Victor Trappler , Arthur Vidard

ISDA 2023 - 9th International Symposium on Data Assimilation, Oct 2023, Bologne, Italy. , pp.1-1, 2023

Poster de conférence hal-04309242v1
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Regret-based calibration using GPs

Victor Trappler , Élise Arnaud , Laurent Debreu , Arthur Vidard

Journées CIROQUO 2022, May 2022, Grenoble, France

Poster de conférence hal-03681091v1
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Prise en compte d'incertitudes externes dans l'estimation de paramètres d'un modèle de transfert d'eau et de pesticides à l'échelle du bassin versant

Katarina Radišić , Claire Lauvernet , Arthur Vidard , Etienne Leblois

OZCAR 2022 - OZCAR Summer school, "la science de la zone critique", Jul 2022, Barcelonette, France. pp.1-1

Poster de conférence hal-03807197v1
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How to reduce uncertainties in a coupled and spatialized water quality model using data assimilation?

Emilie Rouzies , Claire Lauvernet , Arthur Vidard

vEGU21 - European Geosciences Union, Apr 2021, Vienne, Austria. pp.1

Poster de conférence hal-03462057v1
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How well mesoscale eddies are represented in oceanic models?

Anass El Aouni , Arthur Vidard

2021 - ECMWF/OceanPredict workshop on Advances in Ocean Data Assimilation, May 2021, Shinfield Park, United Kingdom

Poster de conférence hal-03482822v1
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Adaptive Image Assimilation for 2D Velocity Reconstruction

Long Li , Arthur Vidard , François-Xavier Le Dimet , Jianwei Ma

AOGS 2019 - 16th Annual Meeting Asia Oceania Geosciences Society, Jul 2019, Singapore, Singapore

Poster de conférence hal-02263716v2
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Assimilation of image data into a spatialized water and pesticide flux model

Claire Lauvernet , Laure Gatel , Claudio Paniconi , Matteo Camporese , Anna Botto et al.

CMWR 2018 - XXII Computational Methods in Water Resources, Jun 2018, Saint-Malo, France. pp.1, 2018

Poster de conférence hal-02608128v1
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Data assimilation of image data into a spatialized water and pesticide fluxes model

Claire Lauvernet , Laure Gatel , Damiano Pasetto , Arthur Vidard , Maëlle Nodet et al.

CNA-2016 : Colloque National d'Assimilation de Données 2016, Nov 2016, Grenoble, France. pp.1, 2016

Poster de conférence hal-02605355v1
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Optimal Transportation for Data Assimilation

Nelson Feyeux , Maëlle Nodet , Arthur Vidard

5th International Symposium for Data Assimilation (ISDA 2016), Jul 2016, Reading, United Kingdom. , 2016

Poster de conférence hal-01349637v1
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Data assimilation of image data into a spatialized water and pesticide fluxes model

Claire Lauvernet , Laure Gatel , Damiano Pasetto , Arthur Vidard , Maëlle Nodet et al.

Workshop on Data Assimilation in Terrestrial Systems, Sep 2016, Bonn, Germany. pp.1, 2016

Poster de conférence hal-02604600v1
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Taking into account correlated observation errors by progressive assimilation of multiscale information

Vincent Chabot , Maëlle Nodet , Arthur Vidard

American Geophysical Union Fall Meeting, Dec 2016, San Francisco, United States. 2016

Poster de conférence hal-01402906v1
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Toward variational data assimilation for coupled models: first experiments on a diffusion problem

Rémi Pellerej , Arthur Vidard , Florian Lemarié

ISDA 2016, Jul 2016, Reading, United Kingdom. 2016

Poster de conférence hal-01412165v1
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Application of optimal transport to data assimilation

Nelson Feyeux , Maëlle Nodet , Arthur Vidard

Special semester on new trends in calculus of variation, Dec 2014, Linz, Austria

Poster de conférence hal-01097190v1
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Toward variational assimilation of SARAL/Altika altimeter data in a North Atlantic circulation model at eddy-permitting resolution: assessment of a NEMO-based 4D-VAR system

Pierre-Antoine Bouttier , Jean-Michel Brankart , Guillem Candille , Arthur Vidard , Eric Blayo et al.

OST/ST Altimetry 2014, Oct 2014, Konstanz, Germany

Poster de conférence hal-01100879v1
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Utilisation du transport optimal pour l'assimilation de données

Nelson Feyeux , Maëlle Nodet , Arthur Vidard

Colloque National sur l'Assimilation de données (CNA), Dec 2014, Toulouse, France. 2014

Poster de conférence hal-01097186v1

The SEABASS reference configuration of NEMO: a demonstrator of NEMO-ASSIM tools

Pierre-Antoine Bouttier , Eric Blayo , Jean-Michel Brankart , Pierre Brasseur , Giovanni Abdelnur Ruggiero et al.

Colloque National sur l'Assimilation de Données, Dec 2013, Toulouse, France

Poster de conférence hal-01100890v1
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Report on fully coupled data assimilation in simplified systems with implications for Earth system reanalysis

Arthur Vidard , Rémi Pellerej , Florian Lemarié

[Research Report] Inria Grenoble Rhône-Alpes. 2017

Rapport (rapport de recherche) hal-01667509v1
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Implementation of the weak constraint 4D-Var in NEMOVAR

Bénédicte Lemieux , Arthur Vidard

[Contract] D3.2.1 & D3.2.2, 2012, pp.105

Rapport (rapport contrat/projet) hal-00941614v1
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NEMO Tangent & Adjoint Models (NemoTam) Reference Manual & User's Guide

Arthur Vidard , Franck Vigilant , Rachid Benshila , Charles Deltel

[Contract] D1.3, INRIA. 2011, pp.44

Rapport (rapport contrat/projet) hal-00941626v1
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Sensitivity analysis through adjoint method: application to the GLORYS reanalysis

Arthur Vidard , Elisabeth Rémy , Eric Greiner

[Contract] n° 08/D43, 2011, pp.11

Rapport (rapport contrat/projet) hal-00940839v1
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Assimilation of Lagrangian Data Documentation of the observation operator. Demonstrator for the twin experiments

Claire Chauvin , Arthur Vidard , Maëlle Nodet

[Contract] D2.3.1, 2010, pp.16

Rapport (rapport contrat/projet) hal-00941640v1
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Using a SEEK filter as data assimilation kernel in NEMOVAR inner loops

Bénédicte Lemieux , Jean-Michel Brankart , Arthur Vidard

[Contract] D3.3, 2010, pp.44

Rapport (rapport contrat/projet) hal-00941701v1
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Assimilation of Lagrangian Data in an operational framework

Claire Chauvin , Maëlle Nodet , Arthur Vidard , Pierre-Antoine Bouttier

[Research Report] RR-7840, INRIA. 2010, pp.27

Rapport (rapport de recherche) hal-00652456v1
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Simplification operator and its inverse for multi-incremental assimilation

Arthur Vidard

[Contract] 2010, pp.15

Rapport (rapport contrat/projet) hal-00940214v1
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Assimilation of Lagrangian Data in NEMOVAR

Claire Chauvin , Maëlle Nodet , Arthur Vidard

[Intern report] 2010, pp.15

Rapport inria-00543659v1
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Vector field regularization by generalized diffusion

Innocent Souopgui , François-Xavier Le Dimet , Arthur Vidard

[Research Report] RR-6844, INRIA. 2009, pp.20

Rapport (rapport de recherche) inria-00360904v2
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Spatio-temporal structure extraction and denoising of geophysical fluid image sequences using 3D curvelet transforms

Jianwei Ma , Olivier Titaud , Arthur Vidard , François-Xavier Le Dimet

[Research Report] RR-6683, INRIA. 2008, pp.30

Rapport (rapport de recherche) inria-00329599v1
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Assimilation of Image Sequences in Numerical Models

Olivier Titaud , Arthur Vidard , Innocent Souopgui , François-Xavier Le Dimet

[Research Report] RR-6701, INRIA. 2008, pp.33

Rapport (rapport de recherche) inria-00332815v1

Development of the ECMWF seasonal forecast System 3

David L.T. Anderson , Magdalena Balmaseda , Tim Stockdale , Laura Ferranti , Frédéric Vitart et al.

[Research Report] Technical Memorandum, number 503, ECMWF. 2007, pp.56

Rapport (rapport de recherche) inria-00176170v1

The ECMWF System 3 ocean analysis

Magdalena Balmaseda , Arthur Vidard , David P. Anderson

[Research Report] Technical Memorandum, ECMWF, number 508., 2007, pp.47

Rapport (rapport de recherche) inria-00176165v1
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Building the Tangent and Adjoint codes of the Ocean General Circulation Model OPA with the Automatic Differentiation tool TAPENADE

Moulay Hicham Tber , Laurent Hascoet , Arthur Vidard , Benjamin Dauvergne

[Research Report] RR-6372, INRIA. 2007, pp.28

Rapport (rapport de recherche) inria-00192415v2

Salinity assimilation using S(T) relationships: part I theory.

Keith Haines , Arthur Vidard , J. D. Blower , Jean-Philippe Drécourt , C. Liu et al.

[Research Report] ECMWF Research Department Memorandum #458, 2005

Rapport (rapport de recherche) inria-00325649v1

Impact of ocean observation systems on ocean analysis and seasonal forecasts.

Arthur Vidard , David P. Anderson , Magdalena Balmaseda

[Research Report] ECMWF Research departement memorandum #460, 2004

Rapport (rapport de recherche) inria-00325636v1

Ocean Data Assimilation at ECMWF

Arthur Vidard , David P. Anderson , Tim Stockdale , Magdalena Balmaseda , Alberto Troccoli

[Research Report] rapport WMO, 2003

Rapport (rapport de recherche) inria-00325641v1
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Effect of forcing uncertainty in the sensitivity and calibration of a pesticide transfer model

Katarina Radišić , Claire Lauvernet , Arthur Vidard

SAMO 2025 - 11th International Conference on Sensitivity Analysis of Model Output, Apr 2025, Grenoble, France

Communication dans un congrès hal-05076842v1
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Calibration robuste d'un modèle hydrologique de transfert de pesticides par métamodélisation

Katarina Radišić , Claire Lauvernet , Arthur Vidard

JMSC 2024 - 5ème édition des Journées de Modélisation des Surfaces Continentales, Jun 2024, Strasbourg, France. pp.1-49

Communication dans un congrès hal-04622409v1
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Robust calibration of a water and pesticide transfer model at the catchment scale

Katarina Radišić , Claire Lauvernet , Arthur Vidard

mexico 2024 - Rencontres annuelles du réseau Mexico, INRAE Lyon-Villeurbanne, Dec 2024, Villeurbanne, France

Communication dans un congrès hal-04828019v1
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Consideration of external uncertainties in the estimation of parameters of a water and pesticide transfer model at the watershed scale

Katarina Radišić , Claire Lauvernet , Arthur Vidard

3ème Séminaire du réseau Eaux et systèmes agricoles, Feb 2023, Montpellier, France

Communication dans un congrès hal-04008833v1
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Calibrating a hydrological model robustly to rain perturbations with stochastic surrogates

Katarina Radišić , Claire Lauvernet , Arthur Vidard

LEFE/MANU 2023 - Colloque sur les Méthodes mathématiques et numériques, Météo France, Jun 2023, Toulouse, France

Communication dans un congrès hal-04383513v1
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Sensitivity analysis with external stochastic forcings : application to a water and pesticide transfer model

Katarina Radišić , Claire Lauvernet , Arthur Vidard

MEXICO 2023 - Rencontres annuelles du réseau Mexico, AgroParisTech, Dec 2023, Palaiseau, France. pp.1-36

Communication dans un congrès hal-04383540v1
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Robust calibration of a hydrological model with stochastic surrogates

Katarina Radišić , Claire Lauvernet , Arthur Vidard

MASCOT-NUM 2023 - Workshop Méthodes d'Analyse Stochastique pour les Codes et Traitement NUMériques, Julien Bect (Université Paris-Saclay, CNRS, CentraleSupélec, L2S); Nicolas Bousquet (EDF R&D); Bertrand Iooss (EDF R&D) Anthony Nouy (Centrale Nantes, LMJL); Sidonie Lefebvre (ONERA, DOTA); Anthony Nouy (Centrale Nantes, LMJL); Emmanuel Vazquez (Université Paris-Saclay, CNRS, CentraleSupélec, L2S), Apr 2023, Le Croisic, France. pp.1-2

Communication dans un congrès hal-03983100v1
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Data assimilation to quantify and reduce uncertainty in ecohydrology modelling

Claire Lauvernet , Emilie Rouzies , Arthur Vidard , Alexandre Devers , Jean-Philippe Vidal et al.

Séminaire ITES 2023, ITES, Nov 2023, Strasbourg, France

Communication dans un congrès hal-04387935v1

Which data assimilation method and data source for a multi-compartment hydrology/water quality model? Application on the PESHMELBA model in a small agricultural catchment

Emilie Rouzies , Claire Lauvernet , Arthur Vidard

EGU22 - European Geosciences Union General Assembly, Européan Geosciences Union (EGU), May 2022, Vienne, Austria

Communication dans un congrès hal-03799183v1
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Sensitivity analysis of a spatio-temporal hydrological model for water and pesticide transfers

Katarina Radišić , Emilie Rouzies , Claire Lauvernet , Arthur Vidard

SAMO 2022 - Tenth International Conference on Sensitivity Analysis of Model Output, Mar 2022, Tallahassee, Florida, United States

Communication dans un congrès hal-03800833v1
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Multi-sources data assimilation in a spatialized model of water and pesticide transfers

Emilie Rouzies , Claire Lauvernet , Arthur Vidard

Journées de Modélisation des Surfaces Continentales (JMSC) 2022, Oct 2022, Saint-Martin-d’Hères, France

Communication dans un congrès hal-04389182v1
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Calibrating a Hydrological Model for Pesticide Transfer while Considering Rain Uncertainty

Katarina Radišić , Claire Lauvernet , Arthur Vidard

AGU Fall Meeting 2022 - Science Leads the Future, Dec 2022, Chicago, United States. pp.1-1

Communication dans un congrès hal-03812018v1
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How can we quantify and reduce the uncertainty of a watershed-scale pesticide transfer model? A comparison of several approaches

Emilie Rouzies , Claire Lauvernet , Bruno Sudret , Arthur Vidard

UNCECOMP 2021 - 4th International Conference on Uncertainty Quantification in Computational Sciences and Engineering, Jun 2021, Athènes, Greece. pp.1-14

Communication dans un congrès hal-03462086v1
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Assimilating surface moisture satellite images into a coupled and spatialized water quality model: strategies and challenges

Emilie Rouzies , Claire Lauvernet , Arthur Vidard

International EnKF workshop 2021, Jun 2021, Bergen, Norway. pp.1-17

Communication dans un congrès hal-03462143v1
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Sensitivity Analysis of a Spatio-Temporal Hydrological Model for Pesticide Transfers

Katarina Radišić , Emilie Rouzies , Claire Lauvernet , Arthur Vidard

Rencontres MEXICO 2021, Nov 2021, Toulouse, France

Communication dans un congrès hal-03473097v1

How can we quantify and reduce uncertainties of a catchment-scale pesticide transfer model? Application to the PESHMELBA model

Emilie Rouzies , Claire Lauvernet , Arthur Vidard

Rencontres Mexico 2021, Nov 2021, Toulouse, France. pp.1-31

Communication dans un congrès hal-03462164v1

Sensitivity analysis to evaluate a new spatialized process-oriented model of water and pesticide transfers at the catchment scale

Emilie Rouzies , Claire Lauvernet , Bruno Sudret , Clémentine Prieur , Robert Faivre et al.

iEMSs 2020 - 10th Conference on International Environmental Modelling and Software Society, Sep 2020, Brussels, Belgium. pp.1-40

Communication dans un congrès hal-03124472v1

How can we quantify and reduce the uncertainty of a watershed-scale pesticide transfer model? A comparison of several approaches

Emilie Rouzies , Claire Lauvernet , Arthur Vidard

AGU, Fall meeting 2020, Dec 2020, Online, United States. pp.1

Communication dans un congrès hal-03124554v1

Life-time independent approach to Lagrangian vortices detection

Anass El Aouni , Arthur Vidard

JpGU-AGU 2020 - Joint Meeting on Japan Geoscience Union, Amercian Geophysical Union, May 2020, Makuhari, Japan. pp.1-2

Communication dans un congrès hal-03482804v1
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Toward variational data assimilation for coupled models: first experiments on a diffusion problem

Rémi Pellerej , Arthur Vidard , Florian Lemarié

CARI 2016, Oct 2016, Tunis, Tunisia

Communication dans un congrès hal-01337743v1
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Optimisation-Based Calibration and Model Selection for the Tranus Land Use Module

Thomas Capelle , Peter Sturm , Arthur Vidard , Brian Morton

14th World Conference on Transport Research, Jul 2016, Shanghai, China

Communication dans un congrès hal-01396793v1

Improving coupled model solution mathematical consistency through data assimilation

Arthur Vidard , Rémi Pellerej , Florian Lemarié

International workshop on coupled data assimilation, Oct 2016, Toulouse, France

Communication dans un congrès hal-01411978v1

Wavelet based representation of observation error covariance

Arthur Vidard , Vincent Chabot , Maëlle Nodet

1st GODAE OceanView Data Assimilation Task Team (DA-TT) Workshop, May 2015, Exeter, United Kingdom

Communication dans un congrès hal-01251665v1
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Contributions to the calibration of integrated land use and transportation models

Thomas Capelle , Peter Sturm , Arthur Vidard , Brian Morton

14th International Conference on Computers in Urban Planning and Urban Management, Jul 2015, Boston, United States

Communication dans un congrès hal-01237628v1
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Formulating LUTI Calibration As an Optimisation Problem: Estimation of Tranus Shadow Price and Substitution Parameters

Thomas Capelle , Peter Sturm , Arthur Vidard , Brian Morton

AAAI-15 Workshop on Computational Sustainability, Jan 2015, Austin, TX, United States

Communication dans un congrès hal-01237622v1
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Dealing whith occultation when accounting for observation error correlation in a wavelet space

Arthur Vidard , Maëlle Nodet , Vincent Chabot

8th International Workshop on the Analysis of Multitemporal Remote Sensing Images - Multitemp 2015, Jul 2015, Annecy, France. pp.1-4, ⟨10.1109/Multi-Temp.2015.7245791⟩

Communication dans un congrès hal-01251711v1

Toward variational assimilation of SARAL/Altika altimeter data in a North Atlantic circulation model at eddy-permitting resolution: assessment of a NEMO-based 4D-VAR system

Pierre-Antoine Bouttier , Jean-Michel Brankart , Guillem Candille , Arthur Vidard , Eric Blayo et al.

European Geophysical Union General Assembly 2015, Apr 2015, Vienna, Austria

Communication dans un congrès hal-01250601v1

Optimal transport for data assimilation

Nelson Feyeux , Arthur Vidard , Maëlle Nodet

Workshop transport optimal : théorie et applications, Oct 2015, Bordeaux, France

Communication dans un congrès hal-01251809v1

Global 1° 4D-var ocean reanalysis, is it worth the pain?

Arthur Vidard

1st GODAE OceanView Data Assimilation Task Team (DA-TT) Workshop, May 2015, Exeter, United Kingdom

Communication dans un congrès hal-01251659v1

SEABASS : une configuration de référence pour l'évaluation de systèmes d'assimilation avec le modèle de circulation océanique NEMO

Pierre-Antoine Bouttier , Eric Blayo , Jean-Michel Brankart , Pierre Brasseur , Emmanuel Cosme et al.

Colloque National sur l'Assimilation de données, Dec 2014, Toulouse, France

Communication dans un congrès hal-01093780v1

Performances des méthodes variationnelles d’Assimilation de Données pour le modèle océanique NEMO

Pierre-Antoine Bouttier , Eric Blayo , Jacques Verron , Arthur Vidard

Colloque National sur l'Assimilation de Données, Dec 2014, Toulouse, France

Communication dans un congrès hal-01100884v1

Accounting for correlated observation errors in image data assimilation

Arthur Vidard , Vincent Chabot , Maëlle Nodet

Workshop on correlated observation errors in data assimilation, ESA - University of Reading, Apr 2014, Reading, United Kingdom

Communication dans un congrès hal-00984508v1

Accounting for correlated observation errors in image assimilation

Maëlle Nodet , Vincent Chabot , Arthur Vidard

Filtering High Dimensional Complex Systems, Jun 2014, Warwick, United Kingdom

Communication dans un congrès hal-01096772v1

Accounting for correlated observation errors in image assimilation

Maëlle Nodet , Vincent Chabot , Arthur Vidard

Réunion des Sciences de la Terre RST2014, Oct 2014, Pau, France

Communication dans un congrès hal-01096782v1
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Formulating LUTI calibration as an optimisation problem: example of Tranus shadow-price estimation

Thomas Capelle , Peter Sturm , Arthur Vidard

Symposium "Towards integrated modelling of urban systems", Oct 2014, Lyon, France

Communication dans un congrès hal-01093248v1
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Vers une prise en compte des corrélations spatiales au sein des erreurs d’observation pour des séquences d'images

Vincent Chabot , Maëlle Nodet , Arthur Vidard

Congrès National d'Assimilation de données, Dec 2014, Toulouse, France

Communication dans un congrès hal-01096901v1
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A survey on the calibration and validation of integrated land use and transportation models

Patrick Bonnel , Nicolas Coulombel , Emmanuel Prados , Peter Sturm , Élise Arnaud et al.

Symposium "Towards integrated modelling of urban systems", Oct 2014, Lyon, France

Communication dans un congrès hal-01093254v1

Accounting for correlated observation errors in image assimilation

Maëlle Nodet , Vincent Chabot , Arthur Vidard

Microlocal analysis and applications, Jun 2014, Nice, France

Communication dans un congrès hal-01096770v1
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Accounting for correlated observation errors in image data assimilation

Vincent Chabot , Arthur Vidard , Maëlle Nodet , Nicolas Papadakis

Conférence Africaine sur la Recherche en Informatique et Mathématiques Appliquées (CARI'14), Oct 2014, Saint Louis, Senegal

Communication dans un congrès hal-01119039v1
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Assimilation de séquences d'images : vers une prise en compte des corrélations spatiales au sein des erreurs d'observation

Vincent Chabot , Maëlle Nodet , Nicolas Papadakis , Arthur Vidard

Journées Francophones "Extraction et Gestion des Connaissances" (EGC'14), Jan 2014, Rennes, France. pp.1-11

Communication dans un congrès hal-00942711v1
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Assimilation directe de séquences d'images de traceur passif : application aux équations de Saint-Venant

Vincent Chabot , Maëlle Nodet , Arthur Vidard , Nicolas Papadakis

Colloque du Groupe de Recherche et d'Etudes de Traitement du Signal et des Images (GRETSI'13), Sep 2013, Brest, France. pp.1-4

Communication dans un congrès hal-00913992v1

The control of non-linear mesoscale ocean circulation through altimetric data assimilation revisited using a variational approach

Pierre-Antoine Bouttier , Eric Blayo , Jacques Verron , Pierre Brasseur , Arthur Vidard

OSTST Meeting, Oct 2013, Boulder, United States

Communication dans un congrès hal-00924723v1

Multi resolution variational data assimilation system for the ocean

Arthur Vidard , Laurent Debreu , Emilie Neveu

EGU 2013 - European Geosciences Union General Assembly 2013, Apr 2013, Vienne, Austria

Communication dans un congrès hal-00877890v1

Transport optimal pour l'assimilation de données images

Maëlle Nodet , Arthur Vidard

Atelier prospective ARC3 Région Rhône-Alpes, Sep 2013, Lyon, France

Communication dans un congrès hal-00921884v1

Multi Resolution Variational Data Assimilation Schemes With Application to a Realistic Ocean Model

Arthur Vidard , Laurent Debreu , Emilie Neveu

Sixth WMO Symposium on Data Assimilation, Oct 2013, College Park, United States

Communication dans un congrès hal-00877893v1
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Assimilation d'images et de structures

Nicolas Papadakis , Vincent Chabot , Alexandros Makris , Maëlle Nodet , Arthur Vidard

Colloque du Groupe de Recherche et d'Etudes de Traitement du Signal et des Images (GRETSI'13), Sep 2013, Brest, France. pp.1-4

Communication dans un congrès hal-00836062v3

Assimilation directe de séquences d'images bruités

Vincent Chabot , Maëlle Nodet , Arthur Vidard , Nicolas Papadakis

Colloque National sur l'Assimilation de Données, Dec 2012, Nice, France

Communication dans un congrès hal-00763248v1

Assimilation directe de séquences d'images

Vincent Chabot , Nicolas Papadakis , Maëlle Nodet , Arthur Vidard

Advanced data assimilation for geosciences, May 2012, Les Houches, France

Communication dans un congrès hal-00763200v1

Extensive validation and diagnostics for the tangent and adjoint models - Application to NEMO

Arthur Vidard , Franck Vigilant , Rachid Benshila

2012 Ocean Sciences Meeting, AGU, Feb 2012, Salt Lake City, United States

Communication dans un congrès hal-00765426v1

Toward Direct Data Assimilation of Image Sequences in Numerical Models

Arthur Vidard , Innocent Souopgui , Olivier Titaud , François-Xavier Le Dimet

ICIAM2011 - 8th International Congress on Industrial & Applied Mathematics, Jul 2011, Vancouver, Canada

Communication dans un congrès hal-00648562v1

Assimilation of Images: A variational framework

François-Xavier Le Dimet , M. Yussuf Hussaini , Nicolas Papadakis , Innocent Souopgui , Arthur Vidard

ISEC - International Symposium on Earth-science Challenges, Sep 2011, Norman, Oklahoma, United States

Communication dans un congrès hal-00769825v1

Toward the Assimilation of Images

François-Xavier Le Dimet , Innocent Souopgui , Arthur Vidard

AMS Annual Meeting, Jan 2011, Seattle, United States

Communication dans un congrès hal-00769826v1

Assimilation of SARAL/AltiKa data for physical ocean prediction and ecosystem monitoring

Jacques Verron , Pierre Brasseur , Jean-Michel Brankart , Emmanuel Cosme , Eric Blayo et al.

Second SARAL/AltiKa Science Workshop, Mar 2011, Ahmedabad, India

Communication dans un congrès hal-00769114v1

Assimilation of Lagrangian Data in a Variational framework

Claire Chauvin , François-Xavier Le Dimet , Maëlle Nodet , Innocent Souopgui , Olivier Titaud et al.

EGU General Asembly, Apr 2011, Vienne, Austria

Communication dans un congrès inria-00587252v1

Méthodes déterministes d'analyse de sensibilité

Arthur Vidard

Journée de l'Atelier Modélisation du Cluster Environnement : Méthodes d'analyse de sensibilité, Oct 2011, Grenoble, France

Communication dans un congrès hal-00648574v1

NEMOVAR, a state of the art Variational Data Assimilation system for NEMO

Arthur Vidard

Hydrodynamic modeling of the Black Sea Dynamics, MHI-NASU, Sep 2011, Sébastopol, Ukraine

Communication dans un congrès hal-00648566v1

Régularisation par diffusion généralisée pour les problèmes inverses mal posés : application au traitement d'images en géophysique

Innocent Souopgui , Arthur Vidard , François-Xavier Le Dimet

CANUM 2010 - 40e Congrès National d'Analyse Numérique, Société de Mathématiques Appliquées et Industrielles, May 2010, Carcans-Maubuisson, France

Communication dans un congrès inria-00544370v1
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A new approach for regularization of inverse problems in images processing

Innocent Souopgui , Emmanuel Kamgnia , François-Xavier Le Dimet , Arthur Vidard

CARI'10 - 10th African Conference on Research in Computer Science and Applied Mathematics, Oct 2010, Yamoussoukro, Côte d’Ivoire. pp.173-180

Communication dans un congrès hal-00539635v1

Direct Assimilation of Image Sequences

Arthur Vidard , Innocent Souopgui , François-Xavier Le Dimet , Olivier Titaud

Altimetry for Oceans and Hydrology, EUMETSAT and CNES, Oct 2010, Lisbonne, Portugal

Communication dans un congrès inria-00544348v1

VODA: Variational Ocean Data Assimilation for multi-scale applications.

Pierre-Antoine Bouttier , Arthur Vidard

Colloque National d'Assimilation de Données, INSU, Dec 2010, Grenoble, France

Communication dans un congrès inria-00544354v1
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Generalised diffusion based regularization for inverse problem in image processing

Innocent Souopgui , Arthur Vidard , François-Xavier Le Dimet

EngOpt 2010 - 2nd International Conference on Engineering Optimization, Technical University of Lisbon and Institute of Mechanical Engineering, Sep 2010, Lisbon, Portugal

Communication dans un congrès inria-00519330v1

Direct Assimilation of Image Sequences

Innocent Souopgui , Arthur Vidard , Olivier Titaud , François-Xavier Le Dimet

Colloque National sur l'Assimilation de Données, Éric Blayo, Marc Bocquet, Emmanuel Cosme, Olivier Talagrand, Jacques Verron, Arthur Vidard, Anne Pierson (assistance secrétariat), Dec 2010, Grenoble, France

Communication dans un congrès inria-00544372v1

Direct data assimilation of image sequences in numerical models

Arthur Vidard

5th WMO International Symposium on Data Assimilation, Oct 2009, Melbourne, Australia

Communication dans un congrès hal-00769820v1

Assimilation of Lagrangian Data in a Variational framework

Claire Chauvin , François-Xavier Le Dimet , Maëlle Nodet , Innocent Souopgui , Olivier Titaud et al.

LAPCOD 2009 - Lagrangian Analysis and Prediction of Coastal and Ocean Dynamics, Sep 2009, La Londe Les Maures, France

Communication dans un congrès inria-00418719v1

Images as Observations in Data Assimilation

Emmanuel Kamgnia , François-Xavier Le Dimet , Innocent Souopgui , Arthur Vidard

NumCoop09 - Numerical methods and North-South Cooperation, Mar 2009, Yaoundé, Cameroon

Communication dans un congrès inria-00391875v1

Toward Assimilation of Sequences of Images in Numerical Models

Arthur Vidard , François-Xavier Le Dimet , Innocent Souopgui , Olivier Titaud

CSE09 - SIAM Conference on Computational Science and Engineering, Mar 2009, Miami, United States

Communication dans un congrès hal-00795816v1

Direct data assimilation of image sequences

Arthur Vidard

SIAM Conference on Computational Science and Engineering, Mar 2009, Miami, United States

Communication dans un congrès hal-00769818v1

A 4D-Var SEEK smoother hybrid. Towards applications in oceanography

Monika Krysta , Eric Blayo , Emmanuel Cosme , Jacques Verron , Arthur Vidard

WWRP/THORPEX Workshop on 4D-Var and Ensemble Kalman filter inter-comparisons, Nov 2008, Buenos Aires, Argentina

Communication dans un congrès inria-00344503v1

Adapting reduced-size control subspace in hybrid data assimilation

Monika Krysta , Eric Blayo , Emmanuel Cosme , Jacques Verron , Arthur Vidard

GODAE Final Symposium, Nov 2008, Nice, France

Communication dans un congrès inria-00344506v1

Hybridisation of data assimilation methods for applications in oceanography

Monika Krysta , Eric Blayo , Emmanuel Cosme , Céline Robert , Jacques Verron et al.

2008 Ocean Sciences Meeting, American Geophysical Union, Mar 2008, Orlando, United States

Communication dans un congrès inria-00344502v1
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Assimilation of Images in Numerical Models in Geophysics

Arthur Vidard , François-Xavier Le Dimet , Innocent Souopgui , Olivier Titaud

EngOpt 2008 - International Conference on Engineering Optimization, COPPE/UFRJ, Jun 2008, Rio de Janeiro, Brazil

Communication dans un congrès inria-00319972v1

Une approche hybride variationnelle-stochastique pour l'assimilation de données

Monika Krysta , Eric Blayo , Emmanuel Cosme , Céline Robert , Jacques Verron et al.

SMAI 2007 - 3e congrès national de mathématiques appliquées et industrielles, Jun 2007, Praz-sur-Arly, France

Communication dans un congrès hal-00795350v1

Hybrid method for data assimilation in oceanography

Monika Krysta , Eric Blayo , Emmanuel Cosme , Céline Robert , Jacques Verron et al.

IUGG XXIV 2007 - XXIV General Assembly of the International Union of Geodesy and Geophysics, Jul 2007, Perugia, Italy

Communication dans un congrès hal-00387428v1

Altimeter Assimilation in a Global Ocean General Circulation Model

Arthur Vidard

Enhancement of Data Assimilation in the Oceanographic Models, MHI, Jun 2007, Sevastopol, Ukraine

Communication dans un congrès inria-00176163v1

Impact of ARGO temperature and salinity measurements in the new ECMWF ocean analysis system, with focus on the interaction with altimeter data

Magdalena Balmaseda , Arthur Vidard , David L.-T. Anderson

15 years of progress in radar altimetry, Mar 2006, Venise, Italy

Communication dans un congrès hal-00171653v1

Assimilation of altimeter data in the ECMWF ocean analysis system

Arthur Vidard , Magdalena Balmaseda , David L.-T. Anderson

15 years of progress in radar altimetry, Mar 2006, Venise, Italy

Communication dans un congrès hal-00171652v1

PALM: A modular data assimilation system

Andrea Piacentini , Anne Fouilloux , Eric Greiner , Thierry Lagarde , Arthur Vidard

Third international symposium on assimilation of observations in meteorology and oceanography, WMO, Jun 1999, Québec City, Canada

Communication dans un congrès inria-00325653v1