Rozprawy doktorskie na temat „Marine Ice sheet”
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Koester, Alexandria Jo. "Rapid thinning of the Laurentide Ice Sheet in coastal Maine, USA during late Heinrich Stadial 1:". Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107308.
Pełny tekst źródłaFew data are available to infer the thinning rate of the Laurentide Ice Sheet (LIS) through the last deglaciation, despite its importance for constraining past ice sheet response to climate warming. We measured 31 cosmogenic 10Be exposure ages in samples collected on coastal mountainsides in Acadia National Park and from the slightly inland Pineo Ridge moraine complex, a ~100-km-long glaciomarine delta, to constrain the timing and rate of LIS thinning and subsequent retreat in coastal Maine. Samples collected along vertical transects in Acadia National Park have indistinguishable exposure ages over a 300 m range of elevation, suggesting that rapid, century-scale thinning occurred at 15.2 ± 0.7 ka, similar to the timing of abrupt thinning inferred from cosmogenic exposure ages at Mt. Katahdin in central Maine (Davis et al., 2015). This rapid ice sheet surface lowering, which likely occurred during the latter part of the cold Heinrich Stadial 1 event (19-14.6 ka), may have been due to enhanced ice-shelf melt and calving in the Gulf of Maine, perhaps related to regional oceanic warming associated with a weakened Atlantic Meridional Overturning Circulation at this time. The ice margin subsequently stabilized at the Pineo Ridge moraine complex until 14.5 ± 0.7 ka, near the onset of Bølling Interstadial warming. Our 10Be ages are substantially younger than marine radiocarbon constraints on LIS retreat in the coastal lowlands, suggesting that the deglacial marine reservoir effect in this area was ~1,200 14C years, perhaps also related to the sluggish Atlantic Meridional Overturning Circulation during Heinrich Stadial 1
Thesis (MS) — Boston College, 2017
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences
Nicholl, Joseph Anthony Leo. "Changes in ice sheet dynamics across the mid-Pleistocene transition recorded in North Atlantic sediments". Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648858.
Pełny tekst źródłaSimmons, Sarah-Louise. "An investigation into the effect of glacially exported nutrients from the Greenland Ice Sheet on marine primary production". Thesis, University of Bristol, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.742982.
Pełny tekst źródłaCook, Carys Patricia. "Insights into the behaviour of the Pliocene East Antarctic ice sheet from provenance studies of marine sediments using radiogenic isotopoes". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/14262.
Pełny tekst źródłaSacchetti, Fabio. "Late Quaternary sedimentation associated with the British-Irish Ice Sheet on the NW Irish continental slope: a marine geological and geophysical investigation". Thesis, University of Manchester, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646396.
Pełny tekst źródłaLeigh, Sasha Naomi Bharier. "A study of the dynamics of the British Ice Sheet during Marine Isotope Stages 2 and 3, focusing on Heinrich Events 2 and 4 and their relationship to the North Atlantic glaciological and climatological conditions /". St Andrews, 2007. http://hdl.handle.net/10023/525.
Pełny tekst źródłaHibbert, Fiona Danielle. "Dynamics of the British Ice Sheet and prevailing hydrographic conditions for the last 175,000 years : an investigation of marine sediment core MD04-2822 from the Rockall Trough". Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/3136.
Pełny tekst źródłaHill, Heather W. "Abrupt climate change during the last glacial period : a Gulf of Mexico perspective". [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001539.
Pełny tekst źródłaVan, Aalderen Victor. "Modéliser l'évolution du climat global et de la calotte eurasienne pendant la dernière déglaciation". Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASJ029.
Pełny tekst źródłaThe marine West Antarctic ice sheet is characterized by being largely in contact with the ocean. The latest observations reveal an acceleration in its mass loss over the last few decades, mainly due to increased melting under floating ice shelves. However, its future evolution remains highly uncertain, due to our poor understanding of the physical processes at play between the ice sheet and the ocean.The last deglaciation (21 ka-11 ka) is one of the most recent major climatic changes in our history. This period is marked by an increase in global atmospheric temperatures and the melting of the North American and Eurasian ice sheets. The study of the Barents-Kara Ice Sheet (BKIS), which covered the Barents and Kara Seas during the Last Glacial Maximum (LGM, 21 ka) and was an integral part of the Eurasian Ice Sheet, is of particular interest because of its common features with present-day West Antarctica. Identifying the mechanisms responsible for its retreat allows to provide information to better understand the West Antarctic behavior within under present and future climatic conditions.The impact of climate on the evolution of a marine ice sheet depends on two main processes: The surface mass balance, depending on atmospheric temperatures and precipitation, and melting under floating ice, related to oceanic temperatures and salinity. In order to identify the mechanisms triggering the BKIS retreat, I used the GRISLI2.0 ice-sheet model to analyse the ice-sheet response to climate perturbations at the LGM. This study highlighted the key role of atmospheric temperatures in triggering the melting of the ice sheet via surface melting, while ocean temperatures had only a limited impact despite a large part of BKIS being in contact with the ocean. I also identified that the total retreat of BKIS could be attributed to a mechanical instability at the grounding line, caused by a decrease in ice thickness resulting from an increase in surface melting.In order to better understand the impact of ice sheets on the global climate, I have also carried out the first transient simulation of the last deglaciation with the IPSL-CM5A2 model, modifying the geometry of the ice sheets provided by the GLAC-1D reconstruction at some key periods. The simulations show a warming trend in line with the reconstructions, particularly during MWP1A, which was characterised by an abrupt rise in atmospheric temperatures. Using sensitivity experiments, I have shown that changes in the ice sheet geometry have contributed to the increase in atmospheric temperatures via temperature-altitude feedbacks and the albedo effect. Moreover, I have shown that ocean dynamics have been significantly altered by freshwater fluxes from the melting ice sheets. This has led to a weakening of the strength of the Atlantic Meridional Overturning Circulation and a reduction of its deepening, resulting in a warming slowdown, mainly located in the North Atlantic Ocean. In addition, the IPSL-CM5A2 experiments all simulate a shutdown of the Antarctic bottom water circulation at the onset of MWP1A, leading to a significant cooling of about 100 years in the Amundsen Sea, followed by a restart of this circulation.This work is contributing to a better understanding of the complex mechanisms governing the dynamics of the ice sheets and their interaction with the climate, while also providing a basis for anticipating the consequences of current and future climate change, particularly in West Antarctica
Nowicki, Sophie Marie Jeanne. "Modelling the transition zone of marine ice sheets". Thesis, University College London (University of London), 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499076.
Pełny tekst źródłaDavison, Stephen. "Reconstructing the last Pleistocene (Late Devensian) glaciation on the continental margin of northwest Britain". Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/766.
Pełny tekst źródłaSabine, Marjolaine. "Contribution relative des forçages climatiques et des processus sédimentaires dans la répartition spatio-temporelle des sédiments des mers nordiques (mers de Norvège, du Groenland et de Barents)". Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0047.
Pełny tekst źródłaThis study focuses on the study of the Middle Pleistocene to Late Quaternary sedimentation patterns and palaeoenvironmental conditions of the Nordic seas (Barents, Iceland, Norwegian and Greenland seas), which mark the transition between the North Atlantic and the Arctic oceans. It is based upon a compilation of acoustic data (bathymetry, multibeam imagery) and sedimentological data (calypso piston cores) retrieved during two cruises leaded by the Shom institute. Sedimentary records showed a large variability of the sedimentary processes at play in those seas, depending of the climatic stages and, thus, of extension or decay conditions of the surrounding ice-sheets. Glacimarine, contouritic, hemipelagic and gravity sedimentary facies are recorded in those sedimentary archives. High resolution stratigraphy was obtained using a combination of radiocarbon datings, XRF geochemistry, oxygen isotopic data and biostratigraphy. This allowed to investigate the sedimentary inputs and processes occurring in those seas from the Middle Quaternary (the beginning of the Mid-Pleistocene Transition) to the Late Holocene. It also allowed a better characterization of the variation in the boreal ice-sheet extension, and to identify periods of Atlantic Waters influence over the core sites
Tooze, SC. "Characterising the deglacial history of the East Antarctic ice sheet in central Wilkes Land using marine sediment cores". Thesis, 2022. https://eprints.utas.edu.au/47561/1/Tooze_whole_thesis.pdf.
Pełny tekst źródła"Laurentide ice sheet meltwater influences and millennial-scale climate oscillations on the northwestern slope of the Gulf of Mexico during Marine Isotope Stage 6 and Termination II". Thesis, 2009. http://hdl.handle.net/1911/61948.
Pełny tekst źródła"Numerical and theoretical treatment of grounding line movement and ice shelf buttressing in marine ice sheets". NEW YORK UNIVERSITY, 2010. http://pqdtopen.proquest.com/#viewpdf?dispub=3365701.
Pełny tekst źródła"Diachronous behavior of the Antarctic ice sheets: Weddell Sea, Antarctica". Thesis, 2012. http://hdl.handle.net/1911/70453.
Pełny tekst źródłaSwadling, KM. "Influence of seasonal ice formation on life cycle strategies of Antarctic copepods". Thesis, 1998. https://eprints.utas.edu.au/22306/1/whole_SwadlingKerrieMarguerite1998_thesis_.pdf.
Pełny tekst źródłaPotter, Emma-Kate. "Sea level, ice sheets and climate during marine isotope sub-stages 5a and 5c". Phd thesis, 2002. http://hdl.handle.net/1885/148684.
Pełny tekst źródłaPesjak, L. "The variability of ocean circulation, productivity, and sea ice in the Adélie region, East Antarctica, over the last two glacial cycles". Thesis, 2022. https://eprints.utas.edu.au/47523/1/Pesjak_whole_thesis.pdf.
Pełny tekst źródłaDarlington, Andrea. "Geophysical constraints on mantle viscosity and its influence on Antarctic glacial isostatic adjustment". Thesis, 2012. http://hdl.handle.net/1828/4001.
Pełny tekst źródłaGraduate