Julien Brajard

Présentation

Publications

Article dans une revue (30)

Machine learning approach to study microboring assemblage dynamics in two living massive coral genera Diego Alaguarda,Julien Brajard,Redouane Lguensat,Aline Tribollet Limnology and Oceanography: Methods, 2025, 23 (11), pp.862-881. ⟨10.1002/lom3.10714⟩ Article dans une revue hal-05381195v1
Four-dimensional variational data assimilation with a sea-ice thickness emulator Charlotte Durand,Tobias Sebastian Finn,Alban Farchi,Marc Bocquet,Julien Brajardet al. The Cryosphere, 2025, 19 (11), pp.5613-5637. ⟨10.5194/tc-19-5613-2025⟩ Article dans une revue hal-05376782v1
Predicting Atlantic and Benguela Niño events with deep learning Marie-Lou Bachèlery,Julien Brajard,Massimiliano Patacchiola,Serena Illig,Noel Keenlyside Science Advances , 2025, 11 (14), ⟨10.1126/sciadv.ads5185⟩ Article dans une revue hal-05023607v1
Monitoring the coastal–offshore water interactions in the Levantine Sea using ocean color and deep supervised learning Georges Baaklini,Julien Brajard,Leila Issa,Gina Fifani,Laurent Mortieret al. Ocean Science, 2024, 20 (6), pp.1707-1720. ⟨10.5194/os-20-1707-2024⟩ Article dans une revue hal-04889078v1
Adaptation of a Neuro-Variational Algorithm from SeaWiFS to MODIS-Aqua Sensor for the Determination of Atmospheric and Oceanic Variables Khassoum Correa,Éric Machu,Julien Brajard,Daouda Diouf,Saïdou Moustapha Sallet al. Remote Sensing, 2023, 15 (14), pp.3613. ⟨10.3390/rs15143613⟩ Article dans une revue hal-04262724v1
Machine Learning-Based Improvement of Aerosol Optical Depth from CHIMERE Simulations Using MODIS Satellite Observations Farouk Lemmouchi,Juan Cuesta,Mathieu Lachatre,Julien Brajard,Adriana Comanet al. Remote Sensing, 2023, 15 (1510), ⟨10.3390/rs15061510⟩ Article dans une revue hal-04274400v1
54 years of microboring community history explored by machine learning in a massive coral from Mayotte (Indian Ocean) Diego Alaguarda,Julien Brajard,Gninwoyo Eric Hermann Coulibaly,Marine Canesi,Éric Douvilleet al. Frontiers in Marine Science, 2022, 9, ⟨10.3389/fmars.2022.899398⟩ Article dans une revue hal-03938202v1
Surface circulation properties in the eastern Mediterranean emphasized using machine learning methods Georges Baaklini,Roy El Hourany,Milad Fakhri,Julien Brajard,Leila Issaet al. Ocean Science, 2022, 18 (5), pp.1491-1505. ⟨10.5194/os-18-1491-2022⟩ Article dans une revue hal-03868344v1
Blending drifters and altimetric data to estimate surface currents: Application in the Levantine Mediterranean and objective validation with different data types Georges Baaklini,Leila Issa,Milad Fakhri,Julien Brajard,Gina Fifaniet al. Ocean Modelling, 2021, 166, pp.101850. ⟨10.1016/j.ocemod.2021.101850⟩ Article dans une revue hal-03329128v1
Bridging observations, theory and numerical simulation of the ocean using machine learning Maike Sonnewald,Redouane Lguensat,Daniel C. Jones,Peter D. Dueben,Julien Brajardet al. Environmental Research Letters, 2021, 16 (7), pp.073008. ⟨10.1088/1748-9326/ac0eb0⟩ Article dans une revue hal-03311328v1
Fusion of Rain Radar Images and Wind Forecasts in a Deep Learning Model Applied to Rain Nowcasting Vincent Bouget,Dominique Béréziat,Julien Brajard,Anastase Alexandre Charantonis,Arthur Filoche Remote Sensing, 2021, 13 (2), pp.246. ⟨10.3390/rs13020246⟩ Article dans une revue hal-03112093v1
Partial differential equations for oceanic artificial intelligence Jules Guillot,Guillaume Koenig,Kadi Minbashian,Emmanuel Frénod,Hélène Flourentet al. ESAIM: Proceedings and Surveys, 2021, 70, pp.137-146. ⟨10.1051/proc/202107009⟩ Article dans une revue hal-03265258v1
Combining data assimilation and machine learning to emulate a dynamical model from sparse and noisy observations: A case study with the Lorenz 96 model Julien Brajard,Alberto Carrassi,Marc Bocquet,Laurent Bertino Journal of computational science, 2020, 44, pp.101171. ⟨10.1016/j.jocs.2020.101171⟩ Article dans une revue hal-03147335v1
Estimation of phytoplankton pigments from ocean-color satellite observations in the Senegalo–Mauritanian region by using an advanced neural classifier Khalil Yala,N'Dèye Niang,Julien Brajard,Carlos Mejia,Mory Ouattaraet al. Ocean Science, 2020, 16 (2), pp.513-533. ⟨10.5194/os-16-513-2020⟩ Article dans une revue hal-02904148v1
First Evidence of Anoxia and Nitrogen Loss in the Southern Canary Upwelling System Éric Machu,Xavier Capet,Philippe Estrade,Siny Ndoye,Julien Brajardet al. Geophysical Research Letters, 2019, 46 (5), pp.2619-2627. ⟨10.1029/2018GL079622⟩ Article dans une revue hal-02067752v1
Data assimilation as a learning tool to infer ordinary differential equation representations of dynamical models Marc Bocquet,Julien Brajard,Alberto Carrassi,Laurent Bertino Nonlinear Processes in Geophysics, 2019, 26 (3), pp.143-162. ⟨10.5194/npg-26-143-2019⟩ Article dans une revue hal-02517929v1
A Spatial and Temporal Analysis of Atmospherics Parameters Retrieved by a Neuro-varationnal Method off the West African Coast Daouda Diouf,Sylvie Thiria,Awa Niang,Julien Brajard,Michel Crepin Journal of Geography, Environment and Earth Science International, 2019, 23 (4), pp.1-14 Article dans une revue hal-05333185v1
Variational assimilation of land surface temperature within the ORCHIDEE Land Surface Model Version 1.2.6 Hector-Simon Benavidès Pinjosovsky,Sylvie Thiria,Catherine Ottle,Julien Brajard,Fouad Badranet al. Geoscientific Model Development, 2017, 10 (1), pp.85-104. ⟨10.5194/gmd-10-85-2017⟩ Article dans une revue hal-01492602v1
Silicon cycle in Indian estuaries and its control by biogeochemical and anthropogenic processes Mangalaa Kameswari Rajasekaran,Damien Cardinal,Julien Brajard,D.B. Rao,N.S. Sarmaet al. Continental Shelf Research, 2017, 148, pp.64-88. ⟨10.1016/j.csr.2017.08.011⟩ Article dans une revue hal-01651900v1
Modelling surface currents in the Eastern Levantine Mediterranean using surface drifters and satellite altimetry Leila Issa,Julien Brajard,Milad Fakhri,Daniel Hayes,Laurent Mortieret al. Ocean Modelling, 2016, 104, pp.1-14. ⟨10.1016/j.ocemod.2016.05.006⟩ Article dans une revue hal-01357669v1
High Performance Numerical Validation using Stochastic Arithmetic Pacôme Eberhart,Julien Brajard,Pierre Fortin,Fabienne Jézéquel Reliable Computing, 2015, 21, pp.35-52 Article dans une revue hal-01254446v1
Inferring the seasonal evolution of phytoplankton groups in the Senegalo-Mauritanian upwelling region from satellite ocean-color spectral measurements Ousmane Farikou,Salam Sawadogo,Awa Niang,Daouda Diouf,Julien Brajardet al. Journal of Geophysical Research. Oceans, 2015, 120 (9), pp.6581--6601. ⟨10.1002/2015JC010738⟩ Article dans une revue istex hal-01507522v1
Multivariate analysis of the Senegalo-Mauritanien area by merging satellite remote sensing ocean color and SST observations Ousmane Farikou,Salam Sawadogo,Niang Awa,Julien Brajard,Carlos Mejia Journal of Research in Environmental and Earth Sciences, 2013, ⟨10.19026/RJEES.5.5733⟩ Article dans une revue hal-02079429v1
Retrieving aerosol characteristics and sea-surface chlorophyll from satellite ocean color multi-spectral sensors using a neural-variational method Daouda Diouf,Awa Niang,Julien Brajard,Michel Crépon,Sylvie Thiria Remote Sensing of Environment, 2013, 130, pp.74 - 86. ⟨10.1016/j.rse.2012.11.002⟩ Article dans une revue istex hal-01495282v1
Atmospheric correction of MERIS data for case-2 waters using a neuro-variational inversion Julien Brajard,Richard Santer,Michel Crépon,Sylvie Thiria Remote Sensing of Environment, 2012, 126, pp.51 - 61. ⟨10.1016/j.rse.2012.07.004⟩ Article dans une revue istex hal-01495015v1
Atmospheric correction of SeaWiFS ocean color imagery in the presence of absorbing aerosols off the Indian coast using a neuro-variational method Julien Brajard,Cyril Moulin,Sylvie Thiria Geophysical Research Letters, 2008, 35, pp.20604. ⟨10.1029/2008GL035179⟩ Article dans une revue hal-00752788v1
Inversion of satellite ocean colour imagery and geoacoustic characterization of seabed properties: Variational data inversion using a semi-automatic adjoint approach Fouad Badran,Mohamed Berrada,Julien Brajard,Michel Crépon,Charles Sorroret al. Journal of Marine Systems, 2008, 69 (1-2), pp.126--136. ⟨10.1016/j.jmarsys.2007.02.018⟩ Article dans une revue istex hal-01507523v1
Estimating aerosol parameters above the ocean from MERIS observations using topological maps Julien Brajard,Awa Niang,Salam Sawadogo,Frank Fell,Richard Santeret al. International Journal of Remote Sensing, 2007, 28 (3-4), pp.781--795. ⟨10.1080/01431160600821101⟩ Article dans une revue hal-01507524v1
Validation of a neuro-variational inversion of ocean colour images Julien Brajard,Cédric Jamet,Cyril Moulin,Sylvie Thiria Advances in Space Research, 2006, 38 (10), pp.2169-2175. ⟨10.1016/j.asr.2006.03.039⟩ Article dans une revue istex hal-00750296v1
Use of a neuro-variational inversion for retrieving oceanic and atmospheric constituents from satellite ocean colour sensor: Application to absorbing aerosols Julien Brajard,Cédric Jamet,Cyril Moulin,Sylvie Thiria Neural Networks, 2006, 19, pp.178-185. ⟨10.1016/j.neunet.2006.01.015⟩ Article dans une revue istex hal-00122477v1

Communication dans un congrès (18)

Learning 4DVAR inversion directly from observations Arthur Filoche,Julien Brajard,Anastase Alexandre Charantonis,Dominique Béréziat Workshop on Machine Learning and Data Assimilation for Dynamical Systems (MLDADS), International Conference on Computational Science (ICCS), Jul 2023, Prague, Czech Republic Communication dans un congrès hal-03863390v2
Variational assimilation of Geophysical images leveraging deep learning tools Arthur Filoche,Dominique Béréziat,Julien Brajard,Anastase Alexandre Charantonis ORASIS 2021, Centre National de la Recherche Scientifique [CNRS], Sep 2021, Saint Ferréol, France Communication dans un congrès hal-03339674v1
Mesoscale Activity in the Eastern Mediterranean: Blending Altimetry with in situ observations Georges Baaklini,Leila Issa,Julien Brajard,Milad Fakhri,Milena Mennaet al. EGU General assembly 2020, May 2020, virtual, Zimbabwe. ⟨10.5194/egusphere-egu2020-20407⟩ Communication dans un congrès hal-03082863v1
Completing physics-based models by learning hidden dynamics through data assimilation Arthur Filoche,Julien Brajard,Anastase Alexandre Charantonis,Dominique Béréziat NeurIPS 2020, workshop AI4Earth, Dec 2020, Vancouver (virtual), Canada Communication dans un congrès hal-03004938v1
Can a neural network learn a numerical model ? Julien Brajard,Anastase Alexandre Charantonis,Jérôme Sirven EGU General Assembly, Apr 2018, Vienne, Austria Communication dans un congrès hal-02067473v1
Improving CADNA Performance on GPUs Pacôme Eberhart,Baptiste Landreau,Julien Brajard,Pierre Fortin,Fabienne Jézéquel 2018 IEEE International Parallel and Distributed Processing Symposium Workshops (IPDPSW), May 2018, Vancouver, Canada. pp.1016-1025, ⟨10.1109/IPDPSW.2018.00156⟩ Communication dans un congrès hal-01858537v1
Predicting Ocean Dynamics through Machine Learning: Application on Sea-Surface Suspended Particulate Mater Julien Brajard,Anastase Alexandre Charantonis,Frédéric Jourdin American Meteorological Society Annual Meeting 2017, American Meteorological Society, Jan 2017, Seattle, United States Communication dans un congrès hal-01477182v1
Estimation of Round-off Errors in OpenMP Codes Pacôme Eberhart,Julien Brajard,Pierre Fortin,Fabienne Jézéquel IWOMP 2016 - 12th International Workshop on OpenMP, Riken AICS, Oct 2016, Nara, Japan. pp.3-16, ⟨10.1007/978-3-319-45550-1_1⟩ Communication dans un congrès hal-01380131v1
Determination of phytoplankton groups from space: application to senegalo-mauritanean upwelling Yala Khalil,Julien Brajard,Michel Crépon,Éric Machu,N'Dèye Niang EGU General Assembly, 2016, Vienne, Austria. pp.15098 Communication dans un congrès hal-01507521v1
Ensemble variational data assimilation with a shallow-water model: preliminary results Julien Brajard,Jérôme Sirven,Olivier Talagrand EGU General Assembly, Apr 2016, Vienne, Austria. pp.14836 Communication dans un congrès hal-01507519v1
Towards high performance stochastic arithmetic Pacôme Eberhart,Julien Brajard,Pierre Fortin,Fabienne Jézéquel 16th international symposium on Scientific Computing, Computer Arithmetic and Validated Numerics (SCAN 2014), Sep 2014, Würzburg, Germany. pp.47-48 Communication dans un congrès hal-01217244v1
Determination of phytoplankton groups from ocean color spectral measurements in the Senegalo-Mauritanian upwelling Ymane Taoufiq,Ousmane Farikou,Séverine Alvain,Julien Brajard,Michel Créponet al. Ocean Optics, The Oceanography Society (TOS), Oct 2014, Portland, Maine, United States Communication dans un congrès hal-01191676v1
Numerical Validation of Data Assimilation Codes Generated by the YAO Software Julien Brajard,Pei Li,Fabienne Jézéquel,Hector-Simon Benavidès Pinjosovsky,Sylvie Thiria SIAM Annual Meeting, Jul 2013, San Diego, CA, United States Communication dans un congrès hal-01216453v1
Neuro-Variational Inversion Applied to Ocean Color Remote Sensing Julien Brajard,Daouda Diouf,Hector-Simon Benavidès Pinjosovsky,Michel Crépon,Richard Santeret al. American Meteorological Society Annual Meeting, 2012, La Nouvelle Orléans, United States Communication dans un congrès hal-00750316v1
Inversion of sea surface data to retrieve the vertical distribution of phytoplankton using a statistical methodology Anastase Alexandre Charantonis,Sylvie Thiria,Cyril Moulin,Julien Brajard Congrès European Geophysical Union, 2011, Vienne, Austria Communication dans un congrès hal-00750248v1
Inverse method for the retrieval of ocean vertical profiles using self-organizing maps and hidden Markov models - Application on Ocean Colour Satellite Image Inversion Anastase Alexandre Charantonis,Julien Brajard,Cyril Moulin,Fouad Badran,Sylvie Thiria NCTA 2011 : NCTA- International Conference on Neural Computation Theory and Applications, 2011, Paris, France Communication dans un congrès hal-00750300v1
Variational data assimilation in NEMO using YAO Mohamed Berrada,Julien Brajard,Charles Deltel,Michel Crépon,Fouad Badranet al. Congrès European Geophysical Union, 2011, Vienne, Austria Communication dans un congrès hal-00750253v1
Atmospheric correction and chlorophyll-a restitution in presence of Saharan dusts Daouda Diouf,Julien Brajard,Awa Niang,Salam Sawadogo,Michel Créponet al. Congrès European Geophysical Union, 2011, Vienne, Austria Communication dans un congrès hal-00750241v1

Poster de conférence (1)

Modeling Surface Currents in the Eastern Levantine Mediterranean Leila Issa,Julien Brajard,Milad Fakhri,Laurent Mortier,Pierre-Marie Poulain EGU General Assembly, Apr 2015, Vienna, Austria. 17, pp.8888 Poster de conférence hal-01191755v1

Chapitre d'ouvrage (1)

Spatial Distribution of Aerosol Optical Thickness Retrieved from SeaWiFS Images by a Neural Network Inversion over the West African Coast Daouda Diouf,Awa Niang,Julien Brajard,Salam Sawadogo,Michel Créponet al. Aerosols-Science and Case Studies, InTech, 2016, 978-953-51-2843-4. ⟨10.5772/65874⟩ Chapitre d'ouvrage hal-01507520v1

Pré-publication, Document de travail (3)

Towards diffusion models for large-scale sea-ice modelling Tobias Sebastian Finn,Charlotte Durand,Alban Farchi,Marc Bocquet,Julien Brajard 2025 Pré-publication, Document de travail hal-05376232v1
Learning Dynamical Systems from Partial Observations Ibrahim Ayed,Emmanuel de Bézenac,Arthur Pajot,Julien Brajard,Patrick Gallinari 2019 Pré-publication, Document de travail hal-02418376v1
Automatic generation of parallel and coherent code using the YAO variational data assimilation framework Luigi Nardi,Julien Brajard,Sylvie Thiria,Fouad Badran,Pierre Fortin 2016 Pré-publication, Document de travail hal-00783328v2