Julien Brajard

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Publications

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
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Four-dimensional variational data assimilation with a sea-ice thickness emulator

Charlotte Durand , Tobias Sebastian Finn , Alban Farchi , Marc Bocquet , Julien Brajard et al.

The Cryosphere, 2025, 19 (11), pp.5613-5637. ⟨10.5194/tc-19-5613-2025⟩

Article dans une revue hal-05376782v1
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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
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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 Mortier et al.

Ocean Science, 2024, 20 (6), pp.1707-1720. ⟨10.5194/os-20-1707-2024⟩

Article dans une revue hal-04889078v1
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Machine Learning-Based Improvement of Aerosol Optical Depth from CHIMERE Simulations Using MODIS Satellite Observations

Farouk Lemmouchi , Juan Cuesta , Mathieu Lachatre , Julien Brajard , Adriana Coman et al.

Remote Sensing, 2023, 15 (1510), ⟨10.3390/rs15061510⟩

Article dans une revue hal-04274400v1
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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 Sall et al.

Remote Sensing, 2023, 15 (14), pp.3613. ⟨10.3390/rs15143613⟩

Article dans une revue hal-04262724v1
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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 Douville et al.

Frontiers in Marine Science, 2022, 9, ⟨10.3389/fmars.2022.899398⟩

Article dans une revue hal-03938202v1
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Surface circulation properties in the eastern Mediterranean emphasized using machine learning methods

Georges Baaklini , Roy El Hourany , Milad Fakhri , Julien Brajard , Leila Issa et al.

Ocean Science, 2022, 18 (5), pp.1491-1505. ⟨10.5194/os-18-1491-2022⟩

Article dans une revue hal-03868344v1
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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 Fifani et al.

Ocean Modelling, 2021, 166, pp.101850. ⟨10.1016/j.ocemod.2021.101850⟩

Article dans une revue hal-03329128v1
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Bridging observations, theory and numerical simulation of the ocean using machine learning

Maike Sonnewald , Redouane Lguensat , Daniel C. Jones , Peter D. Dueben , Julien Brajard et al.

Environmental Research Letters, 2021, 16 (7), pp.073008. ⟨10.1088/1748-9326/ac0eb0⟩

Article dans une revue hal-03311328v1
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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
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Partial differential equations for oceanic artificial intelligence

Jules Guillot , Guillaume Koenig , Kadi Minbashian , Emmanuel Frénod , Hélène Flourent et al.

ESAIM: Proceedings and Surveys, 2021, 70, pp.137-146. ⟨10.1051/proc/202107009⟩

Article dans une revue hal-03265258v1
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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
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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 Ouattara et al.

Ocean Science, 2020, 16 (2), pp.513-533. ⟨10.5194/os-16-513-2020⟩

Article dans une revue hal-02904148v1
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First Evidence of Anoxia and Nitrogen Loss in the Southern Canary Upwelling System

Éric Machu , Xavier Capet , Philippe Estrade , Siny Ndoye , Julien Brajard et al.

Geophysical Research Letters, 2019, 46 (5), pp.2619-2627. ⟨10.1029/2018GL079622⟩

Article dans une revue hal-02067752v1
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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
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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 Badran et al.

Geoscientific Model Development, 2017, 10 (1), pp.85-104. ⟨10.5194/gmd-10-85-2017⟩

Article dans une revue hal-01492602v1
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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. Sarma et al.

Continental Shelf Research, 2017, 148, pp.64-88. ⟨10.1016/j.csr.2017.08.011⟩

Article dans une revue hal-01651900v1
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Modelling surface currents in the Eastern Levantine Mediterranean using surface drifters and satellite altimetry

Leila Issa , Julien Brajard , Milad Fakhri , Daniel Hayes , Laurent Mortier et al.

Ocean Modelling, 2016, 104, pp.1-14. ⟨10.1016/j.ocemod.2016.05.006⟩

Article dans une revue hal-01357669v1
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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
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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 Brajard et 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
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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 Sorror et 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 Santer et 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
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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
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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 Menna et al.

EGU General assembly 2020, May 2020, virtual, Zimbabwe. ⟨10.5194/egusphere-egu2020-20407⟩

Communication dans un congrès hal-03082863v1
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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
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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
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Determination of phytoplankton groups from ocean color spectral measurements in the Senegalo-Mauritanian upwelling

Ymane Taoufiq , Ousmane Farikou , Séverine Alvain , Julien Brajard , Michel Crépon et 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 Santer et al.

American Meteorological Society Annual Meeting, 2012, La Nouvelle Orléans, United States

Communication dans un congrès hal-00750316v1

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

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

Variational data assimilation in NEMO using YAO

Mohamed Berrada , Julien Brajard , Charles Deltel , Michel Crépon , Fouad Badran et 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 Crépon et al.

Congrès European Geophysical Union, 2011, Vienne, Austria

Communication dans un congrès hal-00750241v1