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Literatura académica sobre el tema "Ventilation de l'océan"
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Artículos de revistas sobre el tema "Ventilation de l'océan"
Delpech, Audrey. "Les courants jets sous-marins : enjeux climatiques et défis scientifiques". La Météorologie, n.º 123 (2023): 039. http://dx.doi.org/10.37053/lameteorologie-2023-0093.
Texto completoTesis sobre el tema "Ventilation de l'océan"
Couespel, Damien. "La désoxygénation de l'océan au cours du 21ème siècle : influence des processus de petite et moyenne échelle". Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS097.
Texto completoThe amount of oxygen in the ocean has decreased since the middle of the 20th century. According to climate projections, this will continue into the 21st century with effects on biogeochemical cycles, aquatic organisms and ecosystems. In the subsurface, deoxygenation is controlled by: 1) solubility, determining the amount of oxygen that can be dissolved, 2) respiration, using oxygen to remineralize organic matter and 3) surface/subsurface exchanges. These mechanisms are affected by climate change: 1) the solubility decreases as the temperature increases, 2) the production of organic matter at the surface decreases, thus decreasing the subsurface respiration and 3) the surface/subsurface exchanges are slowed down due to the increase in stratification. The relative contribution of each of these mechanisms to deoxygenation is still poorly understood. To estimate it, we calculated the transport of oxygen through the base of the mixed layer as well as the respiration under the mixed layer in a climate projection. Our results show that each mechanism contributes in equal proportion to deoxygenation. This result was obtained with a low resolution model. However, studies indicate that small-scale processes can influence the mechanisms controlling deoxygenation, but there is still no estimate of their effects. We have therefore developed an idealized configuration allowing us to perform climate change experiments that explicitly solve these processes. In this framework, our results show that small scale processes attenuate 1) deoxygenation and 2) the responses of the mechanisms involved
Millet, Bruno. "Tracer and model constraints on the ventilation of the deep Pacific Ocean". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASJ019.
Texto completoThe Pacific Ocean represents about 50% of the global ocean volume, making it an essential player in global biogeochemical cycles and their response to external perturbations. In particular, the deep Pacific Ocean hosts major reservoirs of carbon and nutrients, whose size and variations are largely controlled by physical tracer transports. In this thesis, we aim to better understand and constrain the transport of tracers in the deep Pacific Ocean across climate states. We use historical and new observations of conservative tracers, notably oxygen isotopes, combined with numerical models of ocean circulation. We show that isopycnal mixing is an essential control of the ventilation of Pacific mid-depths. A return of abyssal waters to the surface is identified in the modern subarctic Pacific. This upwelling pathway may have been weaker during the Last Glacial Maximum about 20,000 years ago, and the deep North Pacific may have been more strongly layered; however, evidence for the required end member changes in the south of the basin to explain this deep layering remains sparse. State-of-the-art prognostic models of global ocean circulation struggle to represent observationally inferred tracer pathways and turn-over times in the modern North Pacific. However, these tracer pathways remain insufficiently constrained and the underlying dynamics are poorly understood. Analysis of in-situ measurements of the oxygen-18 (18O) isotopic ratio of seawater provides an efficient means to better constrain the origins and routes of tracers in the deep ocean: insights on these routes are derived from existing 18O observations in the Southern, Indian, and Pacific Oceans. We suggest that additional measurements of 18O from modern ocean water samples, and from calcite shells in sediment cores, would provide valuable constraints on present-day and past tracer reservoirs and fluxes in the deep ocean
Radwan, Jean. "Contribution à la mise au point d'une technique de mesure du Kr85 dans l'océan : étude et réalisation d'un système d'extraction, de séparation et de mesure du Krypton total dissous". Paris 6, 1986. http://www.theses.fr/1986PA066529.
Texto completoArchambeau, Anne-Sophie. "Circulation et ventilation dans le secteur indien ouest de l'ocean austral : utilisation de traceurs". Paris 6, 1999. http://www.theses.fr/1999PA066017.
Texto completoDutay, Jean-Claude. "Influence du melange vertical et de la couche de melange sur la ventilation de l'ocean. Simulations numeriques des traceurs transitoires tritium-helium3 et cfcs avec le modele opa". Paris 6, 1998. http://www.theses.fr/1998PA066112.
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