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Artykuły w czasopismach na temat "Champs océaniques"
Peace, Alexander Lewis, Gillian R. Foulger, Christian Schiffer i Ken J. W. McCaffrey. "Evolution of Labrador Sea–Baffin Bay: Plate or Plume Processes?" Geoscience Canada 44, nr 3 (6.10.2017): 91–102. http://dx.doi.org/10.12789/geocanj.2017.44.120.
Pełny tekst źródłaMaes, Christophe. "Dispersion des plastiques marins flottants à la surface des océans". La Météorologie, nr 119 (2022): 053. http://dx.doi.org/10.37053/lameteorologie-2022-0084.
Pełny tekst źródłaJarlan, Lionel, Jaouad Abaoui, Benoît Duchemin, Yves Tourre, Abdelaziz Ouldbba, Sylvain Mangiarotti, Hakim Kharrou i in. "Déterminants climatiques de la variabilité interannuelle des rendements en céréales et prévision précoce. Application a la province de Settat (Maroc)". Revue Française de Photogrammétrie et de Télédétection, nr 204 (8.04.2014): 5–12. http://dx.doi.org/10.52638/rfpt.2013.17.
Pełny tekst źródłaArtaud, Hélène. "Quelques réflexions autour des liens entre océan, arts et sciences. À propos d’un colloque au Muséum national d’histoire naturelle". Natures Sciences Sociétés, 2024. http://dx.doi.org/10.1051/nss/2024031.
Pełny tekst źródłaRodary, Estienne. "Le prédateur inconnu : engagement et distanciation dans les prédations marines". VertigO Volume 23 Numéro 3 (2023). http://dx.doi.org/10.4000/126nk.
Pełny tekst źródłaShiga, John. "Sonar: Empire, Media, and the Politics of Underwater Sound". Canadian Journal of Communication 38, nr 3 (14.09.2013). http://dx.doi.org/10.22230/cjc.2013v38n3a2664.
Pełny tekst źródłaRozprawy doktorskie na temat "Champs océaniques"
Korakas, Alexios. "Approche numérique et expérimentale de la propagation sonore en environnements océaniques tridimensionnels : application aux problèmes inverses". Phd thesis, Ecole Centrale de Lyon, 2010. http://tel.archives-ouvertes.fr/tel-00514915.
Pełny tekst źródłaPoulbot, Valéry. "Contribution à l'étude des champs électriques très basses fréquences en milieu océanique". Phd thesis, Ecole Centrale de Lyon, 1993. http://tel.archives-ouvertes.fr/tel-00139537.
Pełny tekst źródłaArchambault, Théo. "Deep learning for sea surface height reconstruction from multi-variate satellite observations". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS253.
Pełny tekst źródłaThis Ph.D. thesis focuses on reconstructing satellite images of the ocean surface from sparse and noisy measurements. Our objective is the Sea Surface Height (SSH), an important variable to estimate surface currents. It is retrieved through nadir-pointing altimeters, leaving important observation gaps due to their remote sensing technology. Complete SSH maps are produced using linear Optimal Interpolations with low effective resolution.On the other hand, Sea Surface Temperature (SST) products have much higher data coverage, and SST is physically linked to geostrophic currents through advection.This thesis explores deep learning algorithms to estimate SSH fields. Relying on years of data from simulation and observations, deep neural networks are able to learn complex relationships between SSH and SST variables. Using these algorithms and SST observations, we first enhance SSH mapping from a downscaling perspective on a physical simulation. Then, we tackle the SSH interpolation problem on simulation and observation data, with a particular focus on how to transfer the learning in operational settings. Finally, we adapt our method to produce near real-time and forecast estimations
Doin, Marie-Pierre. "Structure des lithosphères océaniques et continentales et anomalies du champ de gravité de la Terre". Paris 6, 1995. http://www.theses.fr/1995PA066072.
Pełny tekst źródłaDanioux, Eric. "Propagation 3D d'ondes inertielles au sein d'un champ turbulent mésoéchelle". Brest, 2007. http://www.theses.fr/2007BRES2010.
Pełny tekst źródłaA current problem in physical oceanography is to identify the sources of energy at the origin of the abyssal mixing associated with thermohaline circulation. An important source s the inertial waves generated by wind. However, the mechanisms driving this energy from the surface to the deep mixing are poorly understood. We study here the tridimensional propagation of inertial waves in a fully turbulent mesoscale eddy field with a primitive equations numerical model. After presenting a review of works to date, we describe various methods for extracting the inertial signal. The 3-D propagation of inertial waves is then described and rationalized. In particular, twa dramatic maxima of the vertical velocity have been found around 100 m and 1700 m. The deep maximum s explained by the decoupling — induced by mesoscale eddies — between high and low vertical modes of inertial velocities. Finally, a new resonance mechanism, associated with the deep maximum, generating small horizontal scales and a frequency twice the inertial frequency, is described. These characteristics suggest that the strong deep vertical velocities could participate to abyssal mixing
Pouliquen, Gaud. "Les anomalies magnétiques marines : contraintes sur les variations courtes périodes des processus de l'accrétion et de l'intensité du champ magnétique terrestre". Paris 7, 2001. http://www.theses.fr/2001PA077236.
Pełny tekst źródłaPoulbot, Valéry. "Contribution à l'étude des champs électriques très basses fréquence en milieu océanique : Elèctromètre expérimental haute-sensibilité : Modélisation du système à l'aide d'éléments". Ecully, Ecole centrale de Lyon, 1993. http://www.theses.fr/1993ECDL0036.
Pełny tekst źródłaWald, Lucien. "Apport de la télédétection spatiale en infrarouge proche et moyen à la connaissance du milieu marin : relations entre le champ de température et le champ de courant, observations de l'état de surface et mesures de la vitesse du vent, la dynamique de la couche superficielle en mer Ligure". Phd thesis, Université du Sud Toulon Var, 1985. http://tel.archives-ouvertes.fr/tel-00955230.
Pełny tekst źródłaGuimbard, Sébastien. "Interprétation et modélisation de mesures à distance de la surface marine dans le domaine micro−onde". Versailles-St Quentin en Yvelines, 2010. http://www.theses.fr/2010VERS0067.
Pełny tekst źródłaThis dissertation presents a general investigation on the use and interpretation of remote sensing measurements of the sea surface at microwave frequencies and specifically aims at better characterizing sea surface roughness effects on emissivity. A review of the state of the art of the scattering and emission theories of the sea surface at microwave frequencies is first proposed. Theorical links between active and passive remote sensing measurements are recalled and discused. Based on electromagnetic models and several active/passive data set analysis, a consistent semi-empirical model of the mutl-incidence angle emissivity change associated with the surface roughness variation is developed. The latter characterizes emissivity changes in terms of Fresnel Reflection coefficient and two rough sea surface statistical parameters. Based on this parameterization, a methodology is proposed to quantify the impacts of ocean surface roughness on the brightness temperature observed in the new mutli-angular data from SMOS
Baaklini, Georges. "Characterization of the Eastern Mediterranean surface dynamics : Insights from drifter assimilation and machine learning techniques". Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS186.
Pełny tekst źródłaAn accurate estimation of the surface circulation is crucial because of its direct impact on physical and bio-geochemical water properties. However, currents estimation remains challenging because the stream field is affected by quickly changing flows. This problem increases in the Eastern Mediterranean Sea, where in-situ observations are relatively scarce and the inaccuracies of altimetric observations increase. Therefore, some of the mesoscale features are still debated or unknown, especially in the Levantine Basin. The thesis goal is to characterize these highly-evolving mesoscale features. In the first part of the thesis, we present a variational assimilation method that merges altimetry with drifters to improve the surface circulation representation along and around the assimilated drifters’ trajectories. We assess the method’s efficiency by comparing the velocities resulting from assimilation with independent in-situ observations and ocean color images. We use the corrected velocities to characterize short-term and local events occurring in the Levantine Basin. However, because of the significant spatio-temporal gaps in drifters’ coverage, the assimilation does not allow a continuous investigation of all the mesoscale patterns and their long-term variabilities in the basin. In the second part of the thesis, we use machine learning techniques to build a catalog of the several circulation regimes in the Levantine Basin, providing a long-term characterization of these features. We also try to explain the possible reasons behind previous contradictory assessments about some features, such as the Mid-Mediterranean Jet. The obtained results in the thesis improve the knowledge of the main mesoscale features’ characteristics, behaviors, and tendencies. The thesis applications could take advantage of other in-situ observations and of future altimetric missions like SWOT, promising to mitigate some of the actual altimetric shortcomings