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Статті в журналах з теми "Forages glaciaires"
McCutcheon, Steven R., and James A. Walker. "Great Mining Camps of Canada 7. The Bathurst Mining Camp, New Brunswick, Part 1: Geology and Exploration History." Geoscience Canada, October 31, 2019, 137–54. http://dx.doi.org/10.12789/geocanj.2019.46.150.
Повний текст джерелаДисертації з теми "Forages glaciaires"
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
Mityar, Hedi. "Approches théorique et expérimentale des écoulements diphasiques dans les têtes de carottier pour le forage glaciaire." Grenoble INPG, 2006. http://www.theses.fr/2006INPG0088.
Повний текст джерелаThe study of the carrots of ice taken from the continent Antarctica allows reaching the climate of the Earth over a wide period of time. The extraction of the carrots of ice is realized by a drill. That this allows extracting samples about 10 cms in diameter and 1 metre long. It thus dives into the borehole in every pass. To avoid the closing of the hole that this is filled with an organic fluid of very nearby density of that of the ice. Cuttings are thus realized in the presence of this fluid. They must be evacuatedto avoid the blockingof drill's head. This evacuation is realized with a system of pumping on a biphasic flow constituted by particles if ice and of the organic fluid. This work is the first one which is interested in the numerical simulation of htis type of flow in a simplified geometry. The experimental approach was centred on the determination of visible coefficients of viscosities and on the exploitation of a prototype representing the drill to the scale 1
Ritz, Catherine. "Un modèle thermo-mécanique d'évolution pour le bassin glaciaire Antarctique Vostok-Glacier Byrd : Sensibilité aux valeurs des paramètres mal connus." Phd thesis, Grenoble 1, 1992. http://tel.archives-ouvertes.fr/tel-00693923.
Повний текст джерелаGential, Luc. "Modélisation du bilan de masse en surface de la calotte glaciaire antarctique." Phd thesis, Grenoble 1, 2007. http://www.theses.fr/2007GRE10092.
Повний текст джерелаThe Antarctic ice sheet surface mass balance (SMB, snow accumulation minus ablation) is sensitive to climate parameters and directly contributes to global mean sea level variations. Therefore, in the perspective of climate change, it is useful to develop tools that can simulate the physical processes involved in the Antarctic surface mass balance. The approach developed in this thesis consists in using a cascade of atmospheric models from large scale to local scale. Thus, a regional climate model (Modèle atmosphérique régional, hereinafter referred to as MAR), forced by European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis, provides a diagnostic physical-based rain- and snowfall disaggregation model with meteorological fields at the regional scale (typically 40-km resolution). In a first part, it is shown that the SMB calculated by MAR is in good agreement with observations in most regions. Nonetheless, runoff appears to be overestimated; the problem vanishes when introducing a dependency of albedo with solar zenithal distance. In a second part, it is shown that although the parameterizations invoked in the disaggregation model are fairly simple, the knowledge of small-scale topography (5-km resolution) is efficiently used to improve the spatial variability of precipitation - and therefore SMB - over coastal regions of Antarctica. Model validation is carried out with the help of snow height measurements provided by automatic weather stations. Over the coastal place of Law Dome, the net accumulation gradient is mostly due to orographic forcing of precipitation (rather than blowing snow). The disaggregation model dramatically underestimates precipitation over the Antarctic Plateau, where polar stratospheric clouds associated with radiative cooling could play a role in the formation of precipitation during the polar night
Gential, Luc. "Modélisation du bilan de masse en surface de la calotte glaciaire antarctique." Phd thesis, Grenoble 1, 2007. http://tel.archives-ouvertes.fr/tel-00189139.
Повний текст джерелаBasile, Isabelle. "Origine des aérosols volcaniques et continentaux de la carotte de glace de Vostok (Antarctique)." Phd thesis, Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10170.
Повний текст джерелаBasile, Isabelle. "Origine des aérosols volcaniques et continentaux de la carotte de glace de Vostok (Antarctique)." Phd thesis, Grenoble 1, 1997. http://tel.archives-ouvertes.fr/tel-00756041.
Повний текст джерелаDelmonte, Barbara. "Origine et variation des concentrations et distributions des poussières d'origine continentale dans les forages de glace en Antarctique." Phd thesis, 2003. http://tel.archives-ouvertes.fr/tel-00701343.
Повний текст джерелаЗвіти організацій з теми "Forages glaciaires"
Steele, K. G., C. L. Baker, and M. B. McClenaghan. Modèles de stratigraphie glaciaire établis à partir de forages, région de Matheson, nord-est de l'Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/194826.
Повний текст джерела