Добірка наукової літератури з теми "Traceurs climatiques"
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Статті в журналах з теми "Traceurs climatiques"
Monier, Vincent, Myriam Ben Saad, and Fernanda Sabrinni-Chatelard. "Aménités territoriales et dérèglement climatique : quelles conséquences pour les modèles de développement résidentiels des communes littorales de la région Provence-Alpes Côte d’Azur ?" Mondes en développement 203, no. 3 (November 6, 2023): 59–81. http://dx.doi.org/10.3917/med.203.0059.
Повний текст джерелаCriqui, Patrick, and Emmanuel Hache. "Garder le cap de la transition énergie-climat." Futuribles N° 455, no. 4 (June 16, 2023): 5–26. http://dx.doi.org/10.3917/futur.455.0005.
Повний текст джерелаZosso Francolini, Ismaël. "Tracer le chemin des possibles : le projet Alplab, un laboratoire en montagne pour questionner la démocratie." Didactica Historica 1, no. 1 (2015): 141–46. http://dx.doi.org/10.33055/didacticahistorica.2015.001.01.141.
Повний текст джерелаBenoit, Benjamin, and Christophe Maurel. "Penser la résilience climatique dans les organisations : un enjeu de « durabilité »." Vie & sciences de l'entreprise N° 220, no. 2 (September 13, 2024): 10–32. http://dx.doi.org/10.3917/vse.220.0010.
Повний текст джерелаSautman, Francesca Canadé. "Du “temps qu’il fait” au temps vécu à la Renaissance : Nature, traces, et textes." Revista de História da Sociedade e da Cultura 18 (December 22, 2018): 343–62. http://dx.doi.org/10.14195/1645-2259_18_18.
Повний текст джерелаSouth, Nigel, Rob White2, and Florence Dubois. "L’émergence et l’avenir de la criminologie environnementale1." Criminologie 49, no. 2 (December 19, 2016): 15–44. http://dx.doi.org/10.7202/1038415ar.
Повний текст джерелаCrotti, P. "Le peuplement paléolithique et mésolithique de la Suisse : la question de l'utilisation des étages montagnards dans les Alpes." Geographica Helvetica 63, no. 3 (September 30, 2008): 167–75. http://dx.doi.org/10.5194/gh-63-167-2008.
Повний текст джерелаÇiner, Attila. "Une revue de la répartition et de l’extension des glaciations pléistocènes et des glaciers actuels en Turquie*." Géographie physique et Quaternaire 57, no. 2-3 (September 22, 2005): 205–18. http://dx.doi.org/10.7202/011314ar.
Повний текст джерелаTouazi, M., and J. P. Laborde. "Modélisation pluie-débit à l’échelle annuelle en Algérie du nord." Revue des sciences de l'eau 17, no. 4 (April 12, 2005): 503–16. http://dx.doi.org/10.7202/705546ar.
Повний текст джерелаGrubrich-Simitis, Ilse, and Ilse Grubrich-Simitis. "Trauma ou pulsion – pulsion et trauma. Leçons à partir de la fantaisie phylogénétique (1915) de Sigmund Freud." Revue française de psychanalyse Vol. 86, no. 3 (May 17, 2022): 599–628. http://dx.doi.org/10.3917/rfp.863.0599.
Повний текст джерелаДисертації з теми "Traceurs climatiques"
Armandine, Les Landes Antoine. "Impact des variations climatiques sur les ressources hydrogéologiques." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S101/document.
Повний текст джерелаGroundwater resources represent approximately 98% of global freshwater resources available for humans on our planet; therefore groundwater is fundamental resource of our societies. Due to climate change and strong link between climate and the cycle of water, an understandable concern is appeared about the potential impacts of climate change on water resources. Nowadays, growing body of evidence supports the fact that changes in climatic conditions (temperature, precipitation, evaporation…) impact the hydrologic cycle and consequently groundwater resources. The identification of groundwater sensibility to climate variations has become essential. The climate is a highly complex system where its variations drive by many factors both natural and human occurs on all time scales. Climatic changes are not a new phenomenon, groundwater resources have already been impacted by effects of climatic variations, are impacting presently and will be in the future. The work carried out under this thesis covered this problematic to characterize the groundwater resources sensibility to climate variations. With the help of environmental tracers analyzed at the regional scale, impacts of major climate events occurred since the last millions years (marine transgression and glacial period) have been identified in the current hydrogeologic system. Then, support by hydrogeological modeling the impact of climate change has been studied through the specific relationships between groundwater and surface water bodies and ocean. All these studies highlight the important sensibility of groundwater resources to climate variations in terms of quality (salinization) and quantity (lower water levels). Hydrogeological resources are particularly sensitive to climate and hydrological variations (recharge changes, seawater intrusion…), as well as to non-climatic factors (human activities). Thus groundwater resources management needs to consider both climatic and non-climatic risks and the long-term adaptation of these systems
Arnoux, Marie. "Interactions lacs-eaux souterraines et sensibilité aux changements climatiques et environnementaux." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS581/document.
Повний текст джерелаIn the face of modern anthropogenic pressures, the preservation of freshwater resources, particularly groundwater, is paramount. This study investigates interactions between small lakes and groundwater in Quebec, where more than 10% of the territory is covered by freshwater including one million inventoried lakes, to determine whether these lakes may be used as indicators of groundwater change. Twenty-one kettle lakes, set in fluvioglacial deposits, have been specifically targeted for this study due to the high likelihood of connection to shallow unconfined aquifers. Groundwater flows were quantified via lake water balances coupled with two natural tracers of groundwater: stable isotopes of water and Radon-222. On a regional scale the majority of these lakes are characterized by an important annual groundwater inflow and a short-to-medium groundwater flushing time. Daily multi-layer modeling of one of the study lakes, Lake Lacasse, highlights the importance of conducting measurements of these complementary tracers on the water column at the local scale. Different climate and environmental change scenarios were tested to determine the long-term evolution of lake geochemistry. The results indicate that the sensitivity of the isotopic composition of lake water to changes in recharge by year 2050 is mainly controlled by the amount of the total lake balance contributed by groundwater, with an optimum sensitivity for 50-80% of the total inflows contributed by groundwater. This research demonstrates that the geochemical signatures of lakes can be used to indicate future groundwater change in response to climate and environmental evolution, which may assist in improvements to the sustainable management of freshwater resources
Ourbak, Timothée. "Variations climatiques interannuelles à interdécennales dans le Pacifique tropical telles qu'enregistrées par les traceurs géochimiques contenus dans les coraux massifs." Bordeaux 1, 2006. http://www.theses.fr/2006BOR13193.
Повний текст джерелаMoreno, Eva. "Propriétés magnétiques des sédiments de la marge du Portugal : traceurs des variations climatiques et océanographiques en Atlantique Nord depuis 340 000 ans." Aix-Marseille 3, 2000. http://www.theses.fr/2000AIX30050.
Повний текст джерелаMagnetic properties of sediments cored along the Portugal Margin have been analyzed and compared to other paleoenviromental indicators in order to reconstruct the climatic variations and oceanic regimes in the North Atlantic during the past 340 000 years. Three mechanisms of mineral transport have been identified : 1) iceberg rafting responsible for IRD (Ice Rafted Detritus) deposition , 2) eolian transport of dust and 3) deep water currents responsible for the transport of fine-grained magnetic minerals. The IRD contain a magnetic fraction (Ti-magnetite) associated with quartz and silicate grains. Their rhythmicity determined by the collapse of Northern ice caps, varies between 5 000 and 11 000 years. The precisely dated IRD layers identified by peaks Sl to S4 are contemporaneous with the Heinrich events HI to H4. IRD layers have also been identified during stages 5, 6 and 7, showing the existence of Heinrich-like events
Bouchet, Marie. "Coherent dating of deep polar ice cores and implications for understanding climate mechanisms." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASJ020.
Повний текст джерелаIt is possible to gain insights from past climate natural variability in order to constrain the response of the climate system to change in the external forcing and future projections. Paleoclimate data provide empirical estimates of pre-anthropic large-scale climate change across a range of timescales, including the long timescales (several thousand years) associated with the glacial-interglacial transitions of great amplitude that affected Earth's climate every ~100 thousand years over the past million years. This is of particular interest for climatic projections, as it may allow for the estimation of the rate of ice cap melting. Furthermore, paleoclimate data can be employed to investigate "tipping point" events, which show the potential for rapid (over a few decades) and significant instabilities in the climate system. Among the paleo archives, deep polar ice cores are distinctive in that they offer direct records of ancient global atmospheric composition in greenhouse gases and documented past local changes in snowfall and temperature. My PhD focused on the EPICA Dome C (EDC) drilling site in East Antarctica which provides the oldest continuous ice core record so far. It documents climate change that occurred over a wide range of timescales (from a few decades to several thousands of years) over the past 800,000 years. While water isotopes are classically used to infer past temperature and accumulation rate when measured in ice cores, we show that δ¹⁵N of N2 measured in air bubbles trapped in ice core can be a complementary tool. δ¹⁵N of N2 indeed reflects the depth of bubble enclosure in the ice sheet, itself driven by surface temperature and snow accumulation rate at surface. A new record of δ¹⁵N of N2 over the last 800 kyr is presented and provides an accurate identification of the lead-lag relationship between atmospheric CO₂ and Antarctic climate over deglaciations. Secondly, I developed a precise, coherent timescale for five deep polar ice cores, spanning the past 800,000 years, known as the Antarctic Ice Core Chronology (AICC) 2023. This timescale is built using the probabilistic dating model Paleochrono-1.1 and constrained by new EDC measurements and glaciological modeling outputs. This permitted to reduce the average uncertainty of the EDC age scale from 1,700 to 900 years. The revised chronology aligns better with independent and absolute chronologies of other paleo archives.Furthermore, we proposed a methodology for constructing coherent, relative, and absolute chronologies for marine and glacial archives over past glacial-interglacial cycles. Evaluating the sensitivity of the coherent chronology to dating methodologies produced robust error bars, aiding in the precise identification of climatic event sequences (e.g. relative timing of changes in insolation, atmospheric greenhouse gases, global sea level, and regional temperatures) during glacial-interglacial transitions. In a preliminary study, we identify a few-year lead of atmospheric CO2 with respect to sea level in six of the seven latest deglaciations. Further research is needed to study the implications of such chronologies to understand the causal relationships between external forcing and the climate's internal response.My approach combined glaciological and statistical modeling with an experimental analysis of air trapped in EDC ice core and a data analysis of various paleo records from polar ice cores, marine sedimentary cores and speleothems. My research contributes significantly to improving climate reconstructions from ice cores, reducing dating uncertainties, and developing coherent chronological frameworks. These advancements enhance our understanding of the climate's response to an external forcing and of the interactions between different Earth System components during glacial-interglacial transitions
Freudenthal, Sébastien. "Utilisation des fréons comme traceurs de la circulation profonde en Atlantique tropical. : identification et suivi de la composante récente de l'eau de la Mer du Labrador entre 1990 et 2000." Paris 6, 2002. http://www.theses.fr/2002PA066522.
Повний текст джерелаHuntsman-Mapila, Philippa. "Bassins de rift à des stades précoces de leur développement : l'exemple du bassin Makgadikgadi-Okavango-Zambezi, Botswana et du bassin Sud-Tanganyika (Tanzanie et Zambie) : composition géochimique des sédiments : traceurs des changements climatiques et tectoniques." Brest, 2006. https://tel.archives-ouvertes.fr/tel-00161196.
Повний текст джерелаThis thesis presents the results of a multidisciplinary study of sediments, with an emphasis on geochemistry, with the following objectives: I) improve our understanding of geochemical processes occurring as a result of erosion, transport and deposition in two rift basin in their early stage of development; 2) reconstruct environments in these two regions of the rift during the Late Pleistocene and Holocene and 3) define sedimentary and geochemical criteria to allow us to discriminate tectonic setting and climate change in nascent and early stage rift basins. 11e two basins chosen to represent early stage rift development were I) the Makgadikgadi-Okavango-Zambezi basin located in NW Botswana md 2) the Mpulungu Basin, located at the south-western extremity of Lake Tanganyika. The geochemicat study of sediments and water of the Okavango Delta revealed the presence of elevated arsenic in the groundwater occurring as n result of the dissolution of oxides under reducing conditions. The presence of elevated arsenic in the sediments is linked to organic rich clays, deposited under lacustrine conditions during periods of higher rainfall et possible impoundment of the river by die Thamalakane Fault. The geochemical results were used as n proxy for climate change in the Mpulungu basin. The results indicate n remarkable excursion winch coincides with the Younder Dryas event, Tins environmental event appears to be the most important event in southem Lai Tanganyika during the period 23 —3 ka, winch is characterized by the transport of weathered material into die basin due ton change in vegetation cove in the catchment area
Pichon, Jean-Jacques. "Les diatomées, traceurs de l'évolution climatique et hydrogéologique de l'Océan austral au cours du dernier cycle climatique." Bordeaux 1, 1985. http://www.theses.fr/1985BOR10622.
Повний текст джерелаBourdin, Clément. "Enregistrement des variations climatiques par les éléments traces dans les spéléothèmes." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00863089.
Повний текст джерелаBiscéré, Tom. "Effets des métaux et des changements climatiques sur les coraux." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS382.
Повний текст джерелаCoral reefs have largely degraded in recent decades under the influence of human activities. Among those disturbances, the increase in metal concentrations affects many reefs worldwide (e.g. Australian Great Barrier Reef, Costa Rica, Red Sea, New Caledonia). Furthermore, reefs have now to face climate change, and more particularly temperature increase and ocean acidification. In this context, the aims of my thesis were to (1) determine the effects of the main metals present in lateritic sediments (iron, manganese, nickel and cobalt) on coral physiology using concentrations representative of those measured along the New Caledonian coastline, and to (2) define their potential roles in this context of climate change. My results showed that metals affect coral metabolism in different ways. While at ambient temperature, a nickel or manganese enrichment stimulates host metabolism and symbiont photosynthesis, conversely a cobalt enrichment inhibits calcification and becomes even toxic for the host and symbionts, from 1 μg L-1. Despite its importance in photosynthetic processes, an iron enrichment induces a decrease in Symbiodinium densities and an inhibition of calcification rates. Under thermal stress, manganese enhances coral tolerance to temperature increase, likely by stimulating their antioxidant defenses, while nickel worsens its effects by decreasing even more their growth. These works represent an important step towards a better understanding of coral responses to metal enrichment and would explain, to some extent, species susceptibility to climate change
Звіти організацій з теми "Traceurs climatiques"
Carter, J., and N. L. Hastings. Current state of coastal change monitoring and mapping in Canada: towards a national framework. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/pzkcg43b8e.
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