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Artykuły w czasopismach na temat "Interactions entre calottes glaciaires et le climat"
Rose, Catherine V., Adam C. Maloof, Blair Schoene, Ryan C. Ewing, Ulf Linnemann, Mandy Hofmann i John M. Cottle. "The End-Cryogenian Glaciation of South Australia". Geoscience Canada 40, nr 4 (20.12.2013): 256. http://dx.doi.org/10.12789/geocanj.2013.40.019.
Pełny tekst źródłaRozprawy doktorskie na temat "Interactions entre calottes glaciaires et le climat"
Beghin, Pauline. "Interactions entre les calottes polaires et la circulation atmosphérique pendant les âges glaciaires". Electronic Thesis or Diss., Versailles-St Quentin en Yvelines, 2015. http://www.theses.fr/2015VERS003V.
Pełny tekst źródłaThe last glacial period is characterized by the presence of two large ice sheets covering Canada and North Eurasia. These ice sheets are a key element of the climatic system by interacting with all the components of the Earth system. The aim of this thesis is to determine by which mechanisms changes in atmospheric circulation may have induced a teleconnexionbetween the Northern hemisphere paleo-ice sheets. The use of a simplified coupled climate-ice sheet model allowed to test separately the influence of the ice-sheet topography and albedo on temperature and precipitation fields throughout the last glacial cycle and to highlight the role of atmospheric circulation within the synergy of past boreal ice sheets.To investigate in more details the underlying mechanisms, the use of a general circulation model was necessary.I therefore carried out an inter-comparisonof the PMIP3 models to examine the GCM responsesto glacial conditions. This work allowed to determinethe role of glacial conditions on the shift of the NorthAtlantic jet stream position and to establish a relationshipbetween this shift and the amount of precipitationover southern Europe. The last part of this thesisis devoted to the respective role of each ice sheeton atmospheric circulation changes observed underglacial conditions. To achieve this, I performed idealizedexperiments with the atmospheric circulationmodel LMDZ. The results highlight the key influenceof the North American ice sheet on the Eurasian icesheet surface mass balance
Beghin, Pauline. "Interactions entre les calottes polaires et la circulation atmosphérique pendant les âges glaciaires". Thesis, Versailles-St Quentin en Yvelines, 2015. http://www.theses.fr/2015VERS003V/document.
Pełny tekst źródłaThe last glacial period is characterized by the presence of two large ice sheets covering Canada and North Eurasia. These ice sheets are a key element of the climatic system by interacting with all the components of the Earth system. The aim of this thesis is to determine by which mechanisms changes in atmospheric circulation may have induced a teleconnexionbetween the Northern hemisphere paleo-ice sheets. The use of a simplified coupled climate-ice sheet model allowed to test separately the influence of the ice-sheet topography and albedo on temperature and precipitation fields throughout the last glacial cycle and to highlight the role of atmospheric circulation within the synergy of past boreal ice sheets.To investigate in more details the underlying mechanisms, the use of a general circulation model was necessary.I therefore carried out an inter-comparisonof the PMIP3 models to examine the GCM responsesto glacial conditions. This work allowed to determinethe role of glacial conditions on the shift of the NorthAtlantic jet stream position and to establish a relationshipbetween this shift and the amount of precipitationover southern Europe. The last part of this thesisis devoted to the respective role of each ice sheeton atmospheric circulation changes observed underglacial conditions. To achieve this, I performed idealizedexperiments with the atmospheric circulationmodel LMDZ. The results highlight the key influenceof the North American ice sheet on the Eurasian icesheet surface mass balance
Philippon, Gwenaëlle. "Rôle des calottes glaciaires dans le système climatique : Analyse des interactions entre un modèle de calotte de glace Antarctique et un modèle de climat". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2007. http://tel.archives-ouvertes.fr/tel-00328184.
Pełny tekst źródłaHoang, Thi Khanh Dieu. "A numerical approach to understanding rates of ice sheet build-up during the Quaternary". Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASJ002.
Pełny tekst źródłaDuring the Quaternary (since 2.6 Ma), ice sheets experience different advance-retreat episodes corresponding to glacial-interglacial cycles. Studying these episodic events provides a better understanding of the mechanisms behind the Earth's evolution, improving the future projection for the current global warming.Simulating ice sheet-climate interactions for long timescales requires numerical modeling approaches that sufficiently represent the real system while maintaining low computational costs. In the first part of this thesis, I utilize an Earth System of Intermediate Complexity (iLOVECLIM) coupled to the 3D ice sheet model GRISLI to simulate the abrupt ice sheet advance during the beginning of the last glacial cycle (120-115 kaBP). The results indicate glacial inceptions cannot be explained solely by the astronomical theory (the influence of orbital forcings). The roles of the biosphere and ocean through different feedback mechanisms must be included to explain the location and extent of ice sheet advance. Also, an appropriate simulation of the ice sheet accumulation process is essential to obtain results consistent with the paleo records.In the second part of the thesis, I investigate the behaviors of a multi-layer snow model BESSI to provide a more physics-based surface mass balance (SMB) simulation for iLOVECLIM-GRISLI. The snow model exhibits good results compared to a state-of-the-art Regional Climate Model MAR for the present-day climate under different ice sheet conditions. For the Last Interglacial (130-116 kaBP), BESSI forced by iLOVECLIM shows higher sensitivity to the climate forcings than the existing SMB parameterization of iLOVECLIM-GRISLI. Additionally, the SMB evolution simulated by BESSI-iLOVECLIM is also in an acceptable range compared to other studies. However, since this snow model is more physics-based than the existing parameterization, the influence of biases of iLOVECLIM is more significant for BESSI, hampering its performance. With further work to come on bias correction and the coupling method, my study paves the way for the use of BESSI in the coupling between the iLOVECLIM climate model and the GRISLI ice sheet model