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Littérature scientifique sur le sujet « Ice sheet and climate interactions »

Auteur : Grafiati
Publié le 19 avril 2025

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Articles de revues sur le sujet "Ice sheet and climate interactions"

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Scherrenberg, Meike D. W., Constantijn J. Berends, Lennert B. Stap et Roderik S. W. van de Wal. « Modelling feedbacks between the Northern Hemisphere ice sheets and climate during the last glacial cycle ». Climate of the Past 19, no 2 (8 février 2023) : 399–418. http://dx.doi.org/10.5194/cp-19-399-2023.

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Abstract. During the last glacial cycle (LGC), ice sheets covered large parts of Eurasia and North America, which resulted in ∼120 m of sea level change. Ice sheet–climate interactions have considerable influence on temperature and precipitation patterns and therefore need to be included when simulating this time period. Ideally, ice sheet–climate interactions are simulated by a high-resolution Earth system model. While these models are capable of simulating climates at a certain point in time, such as the pre-industrial (PI) or the Last Glacial Maximum (LGM; 21 000 years ago), a full transient glacial cycle is currently computationally unfeasible as it requires a too-large amount of computation time. Nevertheless, ice sheet models require forcing that captures the gradual change in climate over time to calculate the accumulation and melt of ice and its effect on ice sheet extent and volume changes. Here we simulate the LGC using an ice sheet model forced by LGM and PI climates. The gradual change in climate is modelled by transiently interpolating between pre-calculated results from a climate model for the LGM and the PI. To assess the influence of ice sheet–climate interactions, we use two different interpolation methods: the climate matrix method, which includes a temperature–albedo and precipitation–topography feedback, and the glacial index method, which does not. To investigate the sensitivity of the results to the prescribed climate forcing, we use the output of several models that are part of the Paleoclimate Modelling Intercomparison Project Phase III (PMIP3). In these simulations, ice volume is prescribed, and the climate is reconstructed with a general circulation model (GCM). Here we test those models by using their climate to drive an ice sheet model over the LGC. We find that the ice volume differences caused by the climate forcing exceed the differences caused by the interpolation method. Some GCMs produced unrealistic LGM volumes, and only four resulted in reasonable ice sheets, with LGM Northern Hemisphere sea level contribution ranging between 74–113 m with respect to the present day. The glacial index and climate matrix methods result in similar ice volumes at the LGM but yield a different ice evolution with different ice domes during the inception phase of the glacial cycle and different sea level rates during the deglaciation phase. The temperature–albedo feedback is the main cause of differences between the glacial index and climate matrix methods.
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Gregory, J. M., O. J. H. Browne, A. J. Payne, J. K. Ridley et I. C. Rutt. « Modelling large-scale ice-sheet–climate interactions following glacial inception ». Climate of the Past 8, no 5 (11 octobre 2012) : 1565–80. http://dx.doi.org/10.5194/cp-8-1565-2012.

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Abstract. We have coupled the FAMOUS global AOGCM (atmosphere-ocean general circulation model) to the Glimmer thermomechanical ice-sheet model in order to study the development of ice-sheets in north-east America (Laurentia) and north-west Europe (Fennoscandia) following glacial inception. This first use of a coupled AOGCM–ice-sheet model for a study of change on long palæoclimate timescales is made possible by the low computational cost of FAMOUS, despite its inclusion of physical parameterisations similar in complexity to higher-resolution AOGCMs. With the orbital forcing of 115 ka BP, FAMOUS–Glimmer produces ice caps on the Canadian Arctic islands, on the north-west coast of Hudson Bay and in southern Scandinavia, which grow to occupy the Keewatin region of the Canadian mainland and all of Fennoscandia over 50 ka. Their growth is eventually halted by increasing coastal ice discharge. The expansion of the ice-sheets influences the regional climate, which becomes cooler, reducing the ablation, and ice accumulates in places that initially do not have positive surface mass balance. The results suggest the possibility that the glaciation of north-east America could have begun on the Canadian Arctic islands, producing a regional climate change that caused or enhanced the growth of ice on the mainland. The increase in albedo (due to snow and ice cover) is the dominant feedback on the area of the ice-sheets and acts rapidly, whereas the feedback of topography on SMB does not become significant for several centuries, but eventually has a large effect on the thickening of the ice-sheets. These two positive feedbacks are mutually reinforcing. In addition, the change in topography perturbs the tropospheric circulation, producing some reduction of cloud, and mitigating the local cooling along the margin of the Laurentide ice-sheet. Our experiments demonstrate the importance and complexity of the interactions between ice-sheets and local climate.
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Gregory, J. M., O. J. H. Browne, A. J. Payne, J. K. Ridley et I. C. Rutt. « Modelling large-scale ice-sheet–climate interactions following glacial inception ». Climate of the Past Discussions 8, no 1 (9 janvier 2012) : 169–213. http://dx.doi.org/10.5194/cpd-8-169-2012.

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Abstract. We have coupled the FAMOUS global AOGCM (atmosphere–ocean general circulation model) to the Glimmer thermomechanical ice-sheet model in order to study the development of ice-sheets in North-East America (Laurentia) and North-West Europe (Fennoscandia) following glacial inception. This first use of a coupled AOGCM-ice-sheet model for a study of change on long palæoclimate timescales is made possible by the low computational cost of FAMOUS, despite its inclusion of physical parameterisations of a similar complexity to those of higher-resolution AOGCMs. With the orbital forcing of 115 ka BP, FAMOUS-Glimmer produces ice-caps on the Canadian Arctic islands, on the north-west coast of Hudson Bay, and in Southern Scandinavia, which over 50 ka grow to occupy the Keewatin region of the Canadian mainland and all of Fennoscandia. Their growth is eventually halted by increasing coastal ice discharge. The expansion of the ice-sheets influences the regional climate, which becomes cooler, reducing the ablation, while precipitation increases. Ice accumulates in places that initially do not have positive surface mass balance. The results suggest the possibility that the Laurentide glaciation could have begun on the Canadian Arctic islands, producing a regional climate change that caused or enhanced the growth of ice on the mainland. The increase in albedo due to snow and ice cover is the dominant feedback on the area of the ice-sheets, and acts rapidly, whereas the feedback of topography on SMB does not become significant for several centuries, but eventually has a large effect on the thickening of the ice-sheets. These two positive feedbacks are mutually reinforcing. In addition the change in topography perturbs the tropospheric circulation, producing some reduction of cloud and mitigating the local cooling along the margin of the Laurentide ice-sheet. Our experiments demonstrate the importance and complexity of the interactions between ice-sheets and local climate.
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Abe-Ouchi, Ayako, et Bette Otto-Bliesner. « Ice sheet-climate interactions during the ice age cycle ». PAGES news 17, no 2 (juin 2009) : 73–74. http://dx.doi.org/10.22498/pages.17.2.73.

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NIU, LU, GERRIT LOHMANN, SEBASTIAN HINCK, EVAN J. GOWAN et UTA KREBS-KANZOW. « The sensitivity of Northern Hemisphere ice sheets to atmospheric forcing during the last glacial cycle using PMIP3 models ». Journal of Glaciology 65, no 252 (3 juillet 2019) : 645–61. http://dx.doi.org/10.1017/jog.2019.42.

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ABSTRACTThe evolution of Northern Hemisphere ice sheets through the last glacial cycle is simulated with the glacial index method by using the climate forcing from one General Circulation Model, COSMOS. By comparing the simulated results to geological reconstructions, we first show that the modelled climate is capable of capturing the main features of the ice-sheet evolution. However, large deviations exist, likely due to the absence of nonlinear interactions between ice sheet and other climate components. The model uncertainties of the climate forcing are examined using the output from nine climate models from the Paleoclimate Modelling Intercomparison Project Phase III. The results show a large variability in simulated ice sheets between the different models. We find that the ice-sheet extent pattern resembles summer surface air temperature pattern at the Last Glacial Maximum, confirming the dominant role of surface ablation process for high-latitude Northern Hemisphere ice sheets. This study shows the importance of the upper boundary condition for ice-sheet modelling, and implies that careful constraints on climate output is essential for simulating realistic glacial Northern Hemisphere ice sheets.
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Xie, Zhiang, Dietmar Dommenget, Felicity S. McCormack et Andrew N. Mackintosh. « GREB-ISM v1.0 : A coupled ice sheet model for the Globally Resolved Energy Balance model for global simulations on timescales of 100 kyr ». Geoscientific Model Development 15, no 9 (10 mai 2022) : 3691–719. http://dx.doi.org/10.5194/gmd-15-3691-2022.

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Abstract. We introduce a newly developed global ice sheet model coupled to the Globally Resolved Energy Balance (GREB) climate model for the simulation of global ice sheet evolution on timescales of 100 kyr or longer (GREB-ISM v1.0). Ice sheets and ice shelves are simulated on a global grid, fully interacting with the climate simulation of surface temperature, precipitation, albedo, land–sea mask, topography and sea level. Thus, it is a fully coupled atmosphere, ocean, land and ice sheet model. We test the model in ice sheet stand-alone and fully coupled simulations. The ice sheet model dynamics behave similarly to other hybrid SIA (shallow ice approximation) and SSA (shallow shelf approximation) models, but the West Antarctic Ice Sheet accumulates too much ice using present-day boundary conditions. The coupled model simulations produce global equilibrium ice sheet volumes and calving rates like those observed for present-day boundary conditions. We designed a series of idealized experiments driven by oscillating solar radiation forcing on periods of 20, 50 and 100 kyr in the Northern Hemisphere. These simulations show clear interactions between the climate system and ice sheets, resulting in slow buildup and fast decay of ice-covered areas and global ice volume. The results also show that Northern Hemisphere ice sheets respond more strongly to timescales longer than 100 kyr. The coupling to the atmosphere and sea level leads to climate interactions between the Northern and Southern Hemispheres. The model can run global simulations of 100 kyr d−1 on a desktop computer, allowing the simulation of the whole Quaternary period (2.6 Myr) within 1 month.
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Dutton, Andrea, EJ Stone et A. Carlson. « Ice sheet climate interactions : Implications for coastal engineering ». PAGES news 21, no 1 (mars 2013) : 40. http://dx.doi.org/10.22498/pages.21.1.40.

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Stap, L. B., R. S. W. van de Wal, B. de Boer, R. Bintanja et L. J. Lourens. « Interaction of ice sheets and climate during the past 800 000 years ». Climate of the Past Discussions 10, no 3 (23 juin 2014) : 2547–94. http://dx.doi.org/10.5194/cpd-10-2547-2014.

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Abstract. During the Cenozoic, land ice and climate have interacted on many different time scales. On long time scales, the effect of land ice on global climate and sea level is mainly set by large ice sheets on North America, Eurasia, Greenland and Antarctica. The climatic forcing of these ice sheets is largely determined by the meridional temperature profile resulting from radiation and greenhouse gas (GHG) forcing. As response, the ice sheets cause an increase in albedo and surface elevation, which operates as a feedback in the climate system. To quantify the importance of these climate-land ice processes, a zonally-averaged energy balance climate model is coupled to five one-dimensional ice-sheet models, representing the major ice sheets. In this study, we focus on the transient simulation of the past 800 000 years, where a high-confidence CO2-record from ice cores samples is used as input in combination with Milankovitch radiation changes. We obtain simulations of atmospheric temperature, ice volume and sea level, that are in good agreement with recent proxy-data reconstructions. We examine long-term climate-ice sheet interactions by a comparison of simulations with uncoupled and coupled ice sheets. We show that these interactions amplify global temperature anomalies by up to a factor 2.6, and that they increase polar amplification by 94%. We demonstrate that, on these long time scales, the ice-albedo feedback has a larger and more global influence on the meridional atmospheric temperature profile than the surface-height temperature feedback. Furthermore, we assess the influence of CO2 and insolation, by performing runs with one or both of these variables held constant. We find that atmospheric temperature is controlled by a complex interaction of CO2 and insolation, and both variables serve as thresholds for Northern Hemispheric glaciation.
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Stap, L. B., R. S. W. van de Wal, B. de Boer, R. Bintanja et L. J. Lourens. « Interaction of ice sheets and climate during the past 800 000 years ». Climate of the Past 10, no 6 (4 décembre 2014) : 2135–52. http://dx.doi.org/10.5194/cp-10-2135-2014.

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Abstract. During the Cenozoic, land ice and climate interacted on many different timescales. On long timescales, the effect of land ice on global climate and sea level is mainly set by large ice sheets in North America, Eurasia, Greenland and Antarctica. The climatic forcing of these ice sheets is largely determined by the meridional temperature profile resulting from radiation and greenhouse gas (GHG) forcing. As a response, the ice sheets cause an increase in albedo and surface elevation, which operates as a feedback in the climate system. To quantify the importance of these climate–land ice processes, a zonally averaged energy balance climate model is coupled to five one-dimensional ice sheet models, representing the major ice sheets. In this study, we focus on the transient simulation of the past 800 000 years, where a high-confidence CO2 record from ice core samples is used as input in combination with Milankovitch radiation changes. We obtain simulations of atmospheric temperature, ice volume and sea level that are in good agreement with recent proxy-data reconstructions. We examine long-term climate–ice-sheet interactions by a comparison of simulations with uncoupled and coupled ice sheets. We show that these interactions amplify global temperature anomalies by up to a factor of 2.6, and that they increase polar amplification by 94%. We demonstrate that, on these long timescales, the ice-albedo feedback has a larger and more global influence on the meridional atmospheric temperature profile than the surface-height-temperature feedback. Furthermore, we assess the influence of CO2 and insolation by performing runs with one or both of these variables held constant. We find that atmospheric temperature is controlled by a complex interaction of CO2 and insolation, and both variables serve as thresholds for northern hemispheric glaciation.
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Van Breedam, Jonas, Philippe Huybrechts et Michel Crucifix. « A Gaussian process emulator for simulating ice sheet–climate interactions on a multi-million-year timescale : CLISEMv1.0 ». Geoscientific Model Development 14, no 10 (25 octobre 2021) : 6373–401. http://dx.doi.org/10.5194/gmd-14-6373-2021.

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Abstract. On multi-million-year timescales, fully coupled ice sheet–climate simulations are hampered by computational limitations, even at coarser resolutions and when using asynchronous coupling schemes. In this study, a novel coupling method CLISEMv1.0 (CLimate–Ice Sheet EMulator version 1.0) is presented, where a Gaussian process emulator is applied to the climate model HadSM3 and coupled to the ice sheet model AISMPALEO. The temperature and precipitation fields from HadSM3 are emulated to feed the mass balance model in AISMPALEO. The sensitivity of the evolution of the ice sheet over time is tested with respect to the number of predefined ice sheet geometries that the emulator is calibrated on. Additionally, the model performance is evaluated in terms of the formulation of the ice sheet parameter (being ice sheet volume, ice sheet area or both) and the coupling time. Sensitivity experiments are conducted to explore the uncertainty introduced by the emulator. In addition, different lapse rate adjustments are used between the relatively coarse climate model and the much finer ice sheet model topography. It is shown that the ice sheet evolution over a million-year timescale is strongly sensitive to the definition of the ice sheet parameter and to the number of predefined ice sheet geometries. With the new coupling procedure, we provide a computationally efficient framework for simulating ice sheet–climate interactions on a multi-million-year timescale that allows for a large number of sensitivity tests.
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Thèses sur le sujet "Ice sheet and climate interactions"

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Henderson, Browne Oliver James. « Numerical modelling of large-scale ice-sheet-climate interactions ». Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515704.

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Sanchez-Montes, Maria Luisa. « Climate-ice sheet-ocean interactions in the Gulf of Alaska through the Pliocene and Pleistocene ». Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12634/.

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Global climate is characterised by a long term cooling trend since the Pliocene. However, we lack climate records from the North Pacific to confirm this. The proximity of the GOA to the Mount St. Elias, the highest mountain in the world uplifted during the Plio-Pleistocene, makes the location a target to study the Pacific climate evolution towards present climate, the influence over the growth of large ice sheets over North America as well as the tectonic-ice sheet-climate interactions. This is important as the mid-Pliocene and MIS 5e have been identified as potential analogues for current climate. This thesis focuses on the Pliocene and Pleistocene study of Site U1417 (~700km away from the coast) and U1418 (~150km away from the coast) from the Gulf of Alaska, recovered during IODP Expedition 341. Biomarker extraction and analyses are used for sea surface temperature (SSTs from UK37 and UK37’ indices), sea surface salinity (C37:4), terrestrial and aquatic organic carbon inputs (long, short chain n-alkanes, TAR index, TOC, TON, δ13C and δ15N), marine productivity (alkenone, β-sitosterol, brassicasterol, dinosterol, TOC, TON, δ13C and δ15N concentrations) reconstructions at both sites. We conclude that SST during the early Pleistocene in the GOA was an average of 1°C warmer than during the late Pliocene, the last 500kyr and at modern. The Cordilleran Ice-Sheet developed since 2.8 Ma due to St. Elias tectonic uplift. The Cordilleran Ice-Sheet growth is fed by the humidity of a relatively warm and stratified surface ocean and orographic precipitation since the Pliocene. During the last 500 kyr, warmer SST intervals are associated with a decrease in ocean stratification. Nutrient availability in the GOA is the main control for coccolithophore productivity export reduction since the early Pleistocene. Modern ocean circulation across the North Pacific was established during the LGM and possibly since MIS 4.
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Ladant, Jean-Baptiste. « Interactions climat-calotte durant la greenhouse Crétacé-Paléogène (120-34 Ma) : influence de la paléogéographie et du CO2 atmosphérique ». Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLV019/document.

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Les enregistrements climatiques globaux à l’échelle géologique entre le Crétacé et le début du Cénozoïque indiquent des variations de grande amplitude. Sur le long terme, celles-ci sont déterminées par l’équilibre entre la composition atmosphérique en gaz à effet de serre, principalement le CO2, issus du dégazage volcanique et l’altération continentale, modulée par les mouvements tectoniques des continents. Dans cette thèse, les liens entre paléogéographie et CO2 ont été étudiés dans le contexte des interactions entre climat et calottes de glace au cours d’un intervalle de temps dit de « greenhouse », entre 120 et 34 Ma. L’utilisation d’une suite de modèles impliquant un modèle couplé moyenne résolution, un modèle atmosphérique haute résolution et un modèle de calotte de glace, a permis de montrer que les changements paléogéographiques survenant au Crétacé ont régulé la présence de glace en Antarctique. Dans un second temps, une nouvelle méthode de couplage climat-calotte a été développée pour étudier la glaciation Eocène-Oligocène. Ces développements ont permis de reconstruire une évolution fidèle de celle-ci, en bon accord avec les données. Deux rétroactions liées à cette glaciation et à la chute concomitante du CO2 atmosphérique sont étudiées. En premier lieu, l’impact de la glaciation sur le Courant Circumpolaire Antarctique est abordé, montrant que celle-ci génère une intensification de ce courant. Ensuite, au sein d’une étude mêlant données et modèles pour documenter la présence de moussons en Asie dès l’Eocène moyen, il est montré que le changement climatique de la fin de l’Eocène induit une baisse d’intensité de la mousson asiatique. Enfin, dans la perspective d’analyser les conséquences des changements paléogéographiques du Cénozoïque sur la biogéochimie marine, des tests de sensibilité aux passages océaniques de Panama et de Drake ont été réalisés
On geological timescales, global climate proxies indicate that variations of large magnitude occur between the Cretaceous and the Cenozoic. On the long term, these variations are mostly determined by the equilibrium between the greenhouse gases composition of the atmosphere, primarily the CO2, and continental weathering set up by the spatial location of Earth’s landmasses. Here, the links between paleogeography and CO2 are looked upon in a climate-ice sheet interactions framework during a greenhouse period of Earth history (120 – 34 Ma). A suite of models involving both coupled and ice sheet models have been used to demonstrate that paleogeographic reorganizations have regulated the presence of ice over Antarctica during the Cretaceous. In a second time and using a similar setup, a new method for climate-ice sheet coupling have been developed and applied to the Eocene-Oligocene (EO) glaciation to yield a new scenario of ice evolution, in good agreement with data. Two feedbacks related to this glaciation and the coeval atmospheric CO2 fall are investigated. First, it is shown that the EO glaciation generates an intensification of the Antarctic Circumpolar Current. Second, within a data-model study demonstrating active Asian monsoons as old as the mid-Eocene, it is shown that the climatic change at the end of the Eocene is responsible for a reduction in the intensity of the Asian monsoon. Finally, with the aim of analysing the effect of paleogeographic changes on marine biogeochemistry during the Cenozoic, sensitivity tests to Drake Passage and Panama Seaway have been carried out
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Hoang, 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.

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Au cours du Quaternaire (depuis 2.6 Ma), les calottes glaciaires connaissent différents épisodes d'avancée-retrait correspondant aux cycles glaciaires-interglaciaires. L'étude de ces événements épisodiques permet de mieux comprendre les mécanismes à l'origine de l'évolution de la Terre et d'améliorer les prévisions dans le contexte du réchauffement climatique actuel.La simulation des interactions entre les calottes polaires et le climat sur des échelles de temps aussi longues nécessite des approches de modélisation numérique qui représentent suffisamment le système réel tout en maintenant des coûts de calcul faibles. Dans la première partie de cette thèse, j'utilise un modèle système terre système terrestre de complexité intermédiaire (iLOVECLIM) couplé au modèle 3D de calotte polaires GRISLI pour simuler l'avancée abrupte de la calotte glaciaire au début du dernier cycle glaciaire (120-115 kaBP). Les résultats indiquent que les débuts de glaciation ne peuvent pas être expliqués uniquement par la théorie astronomique (en résponse aux forçages orbitaux). Les rôles de la biosphère et de l'océan par le biais de différents mécanismes de rétroaction doivent être inclus pour expliquer la localisation et l'étendue de l'avancée de la calotte glaciaire. De plus, une simulation appropriée du processus d'accumulation de la calotte glaciaire est essentielle pour obtenir des résultats corrects.Dans la deuxième partie de la thèse, j'étudie les comportements d'un modèle de neige multicouche BESSI afin de fournir une simulation de bilan de masse de surface (SMB) davantage basée sur la physique pour iLOVECLIM-GRISLI. Le modèle de neige présente de bons résultats par rapport à un modèle climatique régional MAR de pointe pour le climat actuel dans différentes conditions de calotte glaciaire. Pour le dernier interglaciaire (130-116 kaBP), BESSI forcé par iLOVECLIM montre une plus grande sensibilité aux forçages climatiques que la paramétrisation SMB existante d'iLOVECLIM-GRISLI. En outre, l'évolution du SMB simulée par BESSI-iLOVECLIM se situe également dans une fourchette acceptable par rapport à d'autres études. Cependant, comme ce modèle de neige est davantage fondé sur la physique que la paramétrisation existante, l'influence des biais d'iLOVECLIM est plus importante pour BESSI, ce qui nuit à ses performances. Moyennant des travaux à venir sur la correction de biais et la méthode de couplage, mon étude ouvre la voie à l'utilisation de BESSI dans le cadre du couplage entre le modèle de climat iLOVECLIM et le modèle de calottes glaciaires GRISLI
During 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
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Ladant, Jean-Baptiste. « Interactions climat-calotte durant la greenhouse Crétacé-Paléogène (120-34 Ma) : influence de la paléogéographie et du CO2 atmosphérique ». Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLV019.

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Les enregistrements climatiques globaux à l’échelle géologique entre le Crétacé et le début du Cénozoïque indiquent des variations de grande amplitude. Sur le long terme, celles-ci sont déterminées par l’équilibre entre la composition atmosphérique en gaz à effet de serre, principalement le CO2, issus du dégazage volcanique et l’altération continentale, modulée par les mouvements tectoniques des continents. Dans cette thèse, les liens entre paléogéographie et CO2 ont été étudiés dans le contexte des interactions entre climat et calottes de glace au cours d’un intervalle de temps dit de « greenhouse », entre 120 et 34 Ma. L’utilisation d’une suite de modèles impliquant un modèle couplé moyenne résolution, un modèle atmosphérique haute résolution et un modèle de calotte de glace, a permis de montrer que les changements paléogéographiques survenant au Crétacé ont régulé la présence de glace en Antarctique. Dans un second temps, une nouvelle méthode de couplage climat-calotte a été développée pour étudier la glaciation Eocène-Oligocène. Ces développements ont permis de reconstruire une évolution fidèle de celle-ci, en bon accord avec les données. Deux rétroactions liées à cette glaciation et à la chute concomitante du CO2 atmosphérique sont étudiées. En premier lieu, l’impact de la glaciation sur le Courant Circumpolaire Antarctique est abordé, montrant que celle-ci génère une intensification de ce courant. Ensuite, au sein d’une étude mêlant données et modèles pour documenter la présence de moussons en Asie dès l’Eocène moyen, il est montré que le changement climatique de la fin de l’Eocène induit une baisse d’intensité de la mousson asiatique. Enfin, dans la perspective d’analyser les conséquences des changements paléogéographiques du Cénozoïque sur la biogéochimie marine, des tests de sensibilité aux passages océaniques de Panama et de Drake ont été réalisés
On geological timescales, global climate proxies indicate that variations of large magnitude occur between the Cretaceous and the Cenozoic. On the long term, these variations are mostly determined by the equilibrium between the greenhouse gases composition of the atmosphere, primarily the CO2, and continental weathering set up by the spatial location of Earth’s landmasses. Here, the links between paleogeography and CO2 are looked upon in a climate-ice sheet interactions framework during a greenhouse period of Earth history (120 – 34 Ma). A suite of models involving both coupled and ice sheet models have been used to demonstrate that paleogeographic reorganizations have regulated the presence of ice over Antarctica during the Cretaceous. In a second time and using a similar setup, a new method for climate-ice sheet coupling have been developed and applied to the Eocene-Oligocene (EO) glaciation to yield a new scenario of ice evolution, in good agreement with data. Two feedbacks related to this glaciation and the coeval atmospheric CO2 fall are investigated. First, it is shown that the EO glaciation generates an intensification of the Antarctic Circumpolar Current. Second, within a data-model study demonstrating active Asian monsoons as old as the mid-Eocene, it is shown that the climatic change at the end of the Eocene is responsible for a reduction in the intensity of the Asian monsoon. Finally, with the aim of analysing the effect of paleogeographic changes on marine biogeochemistry during the Cenozoic, sensitivity tests to Drake Passage and Panama Seaway have been carried out
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6

Hill, 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.

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7

Pohl, Alexandre. « Compréhension du climat de l’Ordovicien à l’aide de la modélisation numérique ». Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV081.

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L’Ordovicien (485–444 Ma) est une période géologique caractérisée par laconcomitance d’une glaciation majeure et de l’une des 5 plus grandes extinctions de masse del’histoire de la Terre. Cette thèse avait pour objectif d’améliorer la compréhension de l’évolutiondu climat à cette époque à l’aide de la modélisation numérique, ain de fournir une imagecohérente de la glaciation. Nous avons d’abord démontré que la coniguration continentaleordovicienne induit une dynamique océanique particulière, à l’origine d’une instabilité climatiquepermettant un refroidissement brutal du climat global sans variation importante de laconcentration atmosphérique en CO2 (pCO2). Dans un deuxième temps, un modèle innovantcouplé climat-calotte a permis de produire la première simulation de la mise en place de la glaciationsupportée par les données géologiques, sous un scénario cohérent de baisse de la pCO2.Les résultats indiquent que les premières glaces continentales se seraient mises en place dèsl’Ordovicien Moyen (465 Ma), quelque 20 millions d’années plus tôt qu’initialement envisagé.Dans ce scénario, le franchissement de l’instabilité climatique ordovicienne marque la miseen place du maximum glaciaire au cours de l’Ordovicien terminal Hirnantien (445–444 Ma).Des expériences réalisées avec un modèle de végétation primitive montrent que le développementdes plantes non-vasculaires a pu constituer le mécanisme à l’origine de la chute de lapCO2, via une intensiication de l’altération des surfaces continentales. Enin, les interactionsentre climat et biosphère marine ont été envisagées selon 2 axes complémentaires. (i) De nouvellescontraintes ont été fournies pour comprendre la paléobiogéographie des communautésmarines, par la publication de cartes de la circulation océanique de surface modélisée sousdiférentes pCO2 au cours de l’Ordovicien Inférieur, Moyen et Supérieur. (ii) Les relationsentre variations climatiques et état redox de l’océan ont été étudiées avec un modèle d’océanrécent bénéiciant d’un module de biogéochimie marine (MITgcm). Les simulations suggèrentdes anoxies partielles (durant le Katien) ou globales (durant le Silurien inférieur) au cours dela transition Ordovicien–Silurien. Elles démontrent également que l’extinction de l’Ordovicienterminal ne serait pas liée à un évènement d’anoxie
The Ordovician (485–444 Ma) is a geological period characterized by theconcomitance of a major glaciation and one of the “Big Five” mass extinction events thatpunctuated the Earth’s history. This dissertation aimed at developing a better understandingof the climatic evolution at that time through numerical modeling, in order to providea consistent picture of the glaciation. First, it was shown that the Ordovician continentalconiguration leads to a particular ocean dynamics, which induces in turn the development ofa climatic instability that allows global climate to cool suddenly in response to subtle changesin the atmospheric partial pressure of CO2 (pCO2). Secondly, an innovative climate-ice sheetcoupled model produced the irst simulation of the glaciation that is supported by geologicaldata, in the context of a decrease in pCO2. Results show that glacial onset may have occurredas early as the Mid Ordovician (465 Ma), i.e., some 20 million years earlier than thoughtinitially. In this scenario, the climatic instability is reached during the latest Ordovician andaccounts for the onset of the Hirnantian glacial maximum (445–444 Ma). Experiments conductedwith a non-vascular vegetation model reveal that the origination and expansion of theirst land plants signiicantly intensiied continental weathering during the Ordovician andpotentially drove the drop in atmospheric CO2. Finally, the interactions between climate andthe marine biosphere were investigated based on 2 complementary axes. (i) News constraintson the paleobiogeography of marine living communities were brought through the publicationof maps showing the ocean surface circulation modeled at various pCO2 levels during theEarly, Middle and Late Ordovician. (ii) The relationships between climatic variations andthe redox state of the ocean were studied using a recent ocean model with biogeochemical capabilities(MITgcm). The simulations suggest partial and global oceanic anoxic events duringthe Katian and the early Silurian respectively. They also show that anoxia is probably notresponsible for the latest Ordovician mass extinction event
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8

Pohl, Alexandre. « Compréhension du climat de l’Ordovicien à l’aide de la modélisation numérique ». Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV081.

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L’Ordovicien (485–444 Ma) est une période géologique caractérisée par laconcomitance d’une glaciation majeure et de l’une des 5 plus grandes extinctions de masse del’histoire de la Terre. Cette thèse avait pour objectif d’améliorer la compréhension de l’évolutiondu climat à cette époque à l’aide de la modélisation numérique, ain de fournir une imagecohérente de la glaciation. Nous avons d’abord démontré que la coniguration continentaleordovicienne induit une dynamique océanique particulière, à l’origine d’une instabilité climatiquepermettant un refroidissement brutal du climat global sans variation importante de laconcentration atmosphérique en CO2 (pCO2). Dans un deuxième temps, un modèle innovantcouplé climat-calotte a permis de produire la première simulation de la mise en place de la glaciationsupportée par les données géologiques, sous un scénario cohérent de baisse de la pCO2.Les résultats indiquent que les premières glaces continentales se seraient mises en place dèsl’Ordovicien Moyen (465 Ma), quelque 20 millions d’années plus tôt qu’initialement envisagé.Dans ce scénario, le franchissement de l’instabilité climatique ordovicienne marque la miseen place du maximum glaciaire au cours de l’Ordovicien terminal Hirnantien (445–444 Ma).Des expériences réalisées avec un modèle de végétation primitive montrent que le développementdes plantes non-vasculaires a pu constituer le mécanisme à l’origine de la chute de lapCO2, via une intensiication de l’altération des surfaces continentales. Enin, les interactionsentre climat et biosphère marine ont été envisagées selon 2 axes complémentaires. (i) De nouvellescontraintes ont été fournies pour comprendre la paléobiogéographie des communautésmarines, par la publication de cartes de la circulation océanique de surface modélisée sousdiférentes pCO2 au cours de l’Ordovicien Inférieur, Moyen et Supérieur. (ii) Les relationsentre variations climatiques et état redox de l’océan ont été étudiées avec un modèle d’océanrécent bénéiciant d’un module de biogéochimie marine (MITgcm). Les simulations suggèrentdes anoxies partielles (durant le Katien) ou globales (durant le Silurien inférieur) au cours dela transition Ordovicien–Silurien. Elles démontrent également que l’extinction de l’Ordovicienterminal ne serait pas liée à un évènement d’anoxie
The Ordovician (485–444 Ma) is a geological period characterized by theconcomitance of a major glaciation and one of the “Big Five” mass extinction events thatpunctuated the Earth’s history. This dissertation aimed at developing a better understandingof the climatic evolution at that time through numerical modeling, in order to providea consistent picture of the glaciation. First, it was shown that the Ordovician continentalconiguration leads to a particular ocean dynamics, which induces in turn the development ofa climatic instability that allows global climate to cool suddenly in response to subtle changesin the atmospheric partial pressure of CO2 (pCO2). Secondly, an innovative climate-ice sheetcoupled model produced the irst simulation of the glaciation that is supported by geologicaldata, in the context of a decrease in pCO2. Results show that glacial onset may have occurredas early as the Mid Ordovician (465 Ma), i.e., some 20 million years earlier than thoughtinitially. In this scenario, the climatic instability is reached during the latest Ordovician andaccounts for the onset of the Hirnantian glacial maximum (445–444 Ma). Experiments conductedwith a non-vascular vegetation model reveal that the origination and expansion of theirst land plants signiicantly intensiied continental weathering during the Ordovician andpotentially drove the drop in atmospheric CO2. Finally, the interactions between climate andthe marine biosphere were investigated based on 2 complementary axes. (i) News constraintson the paleobiogeography of marine living communities were brought through the publicationof maps showing the ocean surface circulation modeled at various pCO2 levels during theEarly, Middle and Late Ordovician. (ii) The relationships between climatic variations andthe redox state of the ocean were studied using a recent ocean model with biogeochemical capabilities(MITgcm). The simulations suggest partial and global oceanic anoxic events duringthe Katian and the early Silurian respectively. They also show that anoxia is probably notresponsible for the latest Ordovician mass extinction event
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9

Gomez, Natalya Alissa. « On Sea Level - Ice Sheet Interactions ». Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11242.

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This thesis focuses on the physics of static sea-level changes following variations in the distribution of grounded ice and the influence of these changes on the stability and dynamics of marine ice sheets. Gravitational, deformational and rotational effects associated with changes in grounded ice mass lead to markedly non-uniform spatial patterns of sea-level change. I outline a revised theory for computing post-glacial sea-level predictions and discuss the dominant physical effects that contribute to the patterns of sea-level change associated with surface loading on different timescales. I show, in particular, that a large sea-level fall (rise) occurs in the vicinity of a retreating (advancing) ice sheet on both short and long timescales. I also present an application of the sea-level theory in which I predict the sea-level changes associated with a new model of North American ice sheet evolution and consider the implications of the results for efforts to establish the sources of Meltwater Pulse 1A. These results demonstrate that viscous deformational effects can influence the amplitude of sea-level changes observed at far-field sea-level sites, even when the time window being considered is relatively short (≤ 500 years).
Earth and Planetary Sciences
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10

Davies, Bethan Joan. « British and Fennoscandian ice-sheet interactions during the Quaternary ». Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2225/.

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Northeastern England and the North Sea Basin is a critical location to examine the influence of glaciation in the northern Hemisphere during the Quaternary. This region was a zone of confluence between the British and Fennoscandian Ice Sheets, and harboured several dynamic ice lobes sourced from northern Scotland, the Cheviots, the Lake District and the Southern Uplands. The region thus has some of the most complex exposures of Middle to Late Pleistocene sediments in Britain, with both interglacial and glacial sediments deposited in terrestrial and marine settings, and being sourced from both the British Isles and northern continental Europe. The research undertaken involved a thorough reinvestigation of the Quaternary sediments of northeast England, making use of enhanced exposures in coastal sections following the cessation of colliery waste dumping, and in boreholes from the North Sea. It used detailed sedimentological, stratigraphical, chronostratigraphical, lithological, petrological, and geochemical techniques to investigate their depositional processes, age, provenance signatures, and regional correlatives to construct an independent model of the eastern margin of the British-Irish Ice Sheet (BUS) throughout the Quaternary, and its interaction in the North Sea Basin with the Fennoscandian Ice Sheet (PIS). This region was a zone of confluence between ice lobes sourced from northern Scotland, the Cheviots, the Lake District and the Southern Uplands, and is ideally placed for investigating the geological record of the North Sea Lobe during the Late Devensian. In addition. County Durham has one of the most northerly exposures of Middle Pleistocene sediments in Britain, including a raised beach and a Scandinavian till. This project focussed on a variety of localities in northeastern England and in the North Sea Basin, including Whitburn Bay, Shippersea Bay, Hawthorn Hive, and Warren House Gill. At Whitburn Bay, the Blackhall and Horden glacigenic members are exposed in superposition and are Late Devensian in age. The lower Blackhall Member here is interpreted as a subglacial traction till with a high percentage of locally derived erratics. A boulder pavement at the top of the till points to a switch in ice-bed conditions and the production of a melt-out lag prior to the deposition of the upper, Horden Member. This second traction till contains erratics and heavy minerals derived from crystalline bedrock sources in the Cheviot Hills and northeast Scotland, including tremolite, andalusite, kyanite and rutile. Within the Horden Member are numerous sand, clay and gravel-filled channels incised into the diamicton, which are attributed to a low energy, distributed, subglacial canal drainage system. Coupled with the hydrofractures and the boulder pavement, this suggests that a partly decoupled, fast flowing ice stream deposited the Horden Member. The eastward, on-shore direction of ice movement indicates that the ice stream was confined in the North Sea Basin, possibly by the presence of Scandinavian ice. From Hawthorn Hive to Warren House Gill, the Blackhall and Horden members are separated by the Peterlee Sands and Gravels, ice-proximal outwash sediments. Beneath the glacial sequence, some 500 m to the south is the Easington Raised Bench. The partly calcreted interglacial beach lies directly on Magnesian Limestone bedrock at 33 m O.D., and consists of beds of unconsolidated, well-bedded, imbricated, well- rounded sands and gravels. It has been dated to MIS 7 by amino acid geochronology and OSL dating. The beach contains exotic gravel, including flint, and previous workers have reported Norwegian erratics. The only currently extant source for these is the Scandinavian Drift at Warren House Gill. Warren House Gill is a classic Middle Pleistocene site, and has a complex stratigraphy, consisting of a lower "Scandinavian Drift" with overlying estuarine sediments, and an upper "Main Cheviot Drift", which comprises two tills and glaciotectonised, interstratified sands and silts, traditionally interpreted as Devensian in age. The lowest grey Scandinavian Drift is a grey, laminated clay with dropstones. It contains marine bivalve fragments, foraminifera, and clasts of northeastern Scotland and Norwegian provenance, as well as Magnesian Limestone, chalk, flint, and Triassic red marl from the North Sea. Reworked palynomorphs include Eocene dinoflagellate cysts. This is interpreted as a Middle Pleistocene glaciomarine deposit, and is renamed the 'Ash Gill Member' of the Warren House Formation, with inputs from both Scottish and Scandinavian sources. It is dated to the Middle Pleistocene by AAR dates on the shell fauna, and by the relationship to the MIS 7 age raised beach. The overlying well sorted pink and red interbedded sands and silts contain carbonate nodules and rare clasls. These shallow subaqueous sediments were deposited through suspension settling and bottom current activity, and they may be reworked loess. They are named the 'Whitesides Member' and are the highest member in the Warren House Formation. The overlying "Cheviot Drift" consists of two ice-marginal traction tills (the Blackhall and Horden members), separated by interbedded glaciofluvial red silts and sands. The till lithologies are indicative of a northern British provenance, and are rich in limestone, coal, sandstone, greywacke and dolerile. The Blackhall Member was deposited by ice during MIS 4, during a period of maximum extent of the British and Fennoscandian ice sheets and contact in the central North Sea. The Horden Member was deposited in an ice- marginal landsystem by the Late Devensian North Sea Lobe, and is correlative with the Skipsea Member in Yorkshire and the Bolders Bank Formation offshore. The Swarte Bank, Coal Pit, Fisher and Bolders Bank formations from the North Sea Basin were also examined. These subglacial and glaciomarine sediments, ranging from MIS 12 to MIS 2 in age, were all found to show a similar provenance from the Grampians, Aberdeenshire and the Scottish Highlands, indicating repeat ice-flow pathways during the Quaternary. This research has significant implications for British Quaternary stratigraphy, as it indicates that Fennoscandian ice was a significant influence on the BIIS throughout the Quaternary, and that on multiple occasions, Fennoscandian ice directly impacted the coast of eastern England. During MIS 12, a marine embayment opened in northeast England between the British and Fennoscandian ice sheets. Ice rafted material derived from both Scottish and Norwegian sources was deposited in this marine embayment. The Ash Gill Member of the Warren House Formation is an isolated remnant of this ancient glaciomarine environment, and it is separated from the overlying Devensian sediments by a substantial unconformity. During the Early Devensian, ice sourced in Scotland flowed eastwards through the Tyne Gap, where it was joined by a minor component of Lake District ice. This was a stage of maximum configuration of the BIIS, with contact with the FIS offshore. During the Last Glacial Maximum, the North Sea Lobe was constrained by the FIS offshore, forcing the North Sea Lobe onshore. This project found no evidence of Lake District erratics in County Durham, but found detrital material in the subglacial tills from the coast of northeastern Scotland.
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Livres sur le sujet "Ice sheet and climate interactions"

1

MacAyeal, D. R. Changes in glaciers and ice sheets : Observations, modelling and environmental interactions. Sous la direction de International Glaciological Society. Cambridge, UK : International Glaciological Society, 2014.

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Abe-Ouchi, Ayako. Ice sheet response to climate changes : A modelling approach. Zurich : Geographisches Institut ETH, 1993.

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United States. National Aeronautics and Space Administration., dir. Assessment of climate variability of the Greenland Ice Sheet : Integration of in situ and satellite data. Boulder, CO : University of Colorado, Cooperative Institute for Research in Environmental Sciences, 1994.

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Atsumu, Ohmura, et ETH Greenland Expedition (1st : 1990), dir. Energy and mass balance during the melt season at the equilibrium line altitude, Paakitsq, Greenland Ice Sheet (69⁰34'25.3" North, 49⁰17'44.1"West, 1175 M A.S.L.). Zurich : Dept. of Geography, ETH, 1991.

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Ice in the climate system. Berlin : Springer-Verlag, 1993.

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Lurcock, Pontus, et Fabio Florindo. Antarctic Climate History and Global Climate Changes. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780190676889.013.18.

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Antarctic climate changes have been reconstructed from ice and sediment cores and numerical models (which also predict future changes). Major ice sheets first appeared 34 million years ago (Ma) and fluctuated throughout the Oligocene, with an overall cooling trend. Ice volume more than doubled at the Oligocene-Miocene boundary. Fluctuating Miocene temperatures peaked at 17–14 Ma, followed by dramatic cooling. Cooling continued through the Pliocene and Pleistocene, with another major glacial expansion at 3–2 Ma. Several interacting drivers control Antarctic climate. On timescales of 10,000–100,000 years, insolation varies with orbital cycles, causing periodic climate variations. Opening of Southern Ocean gateways produced a circumpolar current that thermally isolated Antarctica. Declining atmospheric CO2 triggered Cenozoic glaciation. Antarctic glaciations affect global climate by lowering sea level, intensifying atmospheric circulation, and increasing planetary albedo. Ice sheets interact with ocean water, forming water masses that play a key role in global ocean circulation.
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Lurcock, Pontus, et Fabio Florindo. Antarctic Climate History and Global Climate Changes. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780190699420.013.18.

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Antarctic climate changes have been reconstructed from ice and sediment cores and numerical models (which also predict future changes). Major ice sheets first appeared 34 million years ago (Ma) and fluctuated throughout the Oligocene, with an overall cooling trend. Ice volume more than doubled at the Oligocene-Miocene boundary. Fluctuating Miocene temperatures peaked at 17–14 Ma, followed by dramatic cooling. Cooling continued through the Pliocene and Pleistocene, with another major glacial expansion at 3–2 Ma. Several interacting drivers control Antarctic climate. On timescales of 10,000–100,000 years, insolation varies with orbital cycles, causing periodic climate variations. Opening of Southern Ocean gateways produced a circumpolar current that thermally isolated Antarctica. Declining atmospheric CO2 triggered Cenozoic glaciation. Antarctic glaciations affect global climate by lowering sea level, intensifying atmospheric circulation, and increasing planetary albedo. Ice sheets interact with ocean water, forming water masses that play a key role in global ocean circulation.
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Khare, Neloy. Climate Variability of Southern High Latitude Regions : Sea, Ice, and Atmosphere Interactions. Taylor & Francis Group, 2022.

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Khare, Neloy. Climate Variability of Southern High Latitude Regions : Sea, Ice, and Atmosphere Interactions. CRC Press LLC, 2022.

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Khare, Neloy. Climate Variability of Southern High Latitude Regions : Sea, Ice, and Atmosphere Interactions. Taylor & Francis Group, 2022.

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Chapitres de livres sur le sujet "Ice sheet and climate interactions"

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Broccoli, A. J., et S. Manabe. « Climate Model Studies of Interactions between Ice Sheets and the Atmosphere-Ocean System ». Dans Ice in the Climate System, 271–90. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85016-5_17.

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Letréguilly, Anne, et Catherine Ritz. « Modelling of the Fennoscandian Ice Sheet ». Dans Ice in the Climate System, 21–46. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85016-5_2.

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Budd, W. F., et P. Rayner. « Modelling Ice Sheet and Climate Changes through the Ice Ages ». Dans Ice in the Climate System, 291–319. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85016-5_18.

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Lemke, P. « Modelling Sea Ice - Mixed Layer Interaction ». Dans Modelling Oceanic Climate Interactions, 243–69. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84975-6_7.

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Whillans, I. M., et C. J. van der Veen. « Controls on Changes in the West Antarctic Ice Sheet ». Dans Ice in the Climate System, 47–54. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85016-5_3.

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Paterson, W. S. B. « World Sea Level and the Present Mass Balance of the Antarctic Ice Sheet ». Dans Ice in the Climate System, 131–40. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85016-5_8.

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Andrews, J. T., K. Tedesco et A. E. Jennings. « Heinrich Events : Chronology and Processes, East-Central Laurentide Ice Sheet and NW Labrador Sea ». Dans Ice in the Climate System, 167–86. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85016-5_11.

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van Ypersele, J. P. « Sea-Ice Interactions in Polar Regions ». Dans Energy and Water Cycles in the Climate System, 295–322. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-76957-3_12.

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Grosswald, Mikhail G. « Extent and Melting History of the Late Weichselian Ice Sheet, the Barents-Kara Continental Margin ». Dans Ice in the Climate System, 1–20. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-85016-5_1.

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Scherer, Reed P. « Quaternary interglacials and the West Antarctic Ice Sheet ». Dans Earth's Climate and Orbital Eccentricity : The Marine Isotope Stage 11 Question, 103–12. Washington, D. C. : American Geophysical Union, 2003. http://dx.doi.org/10.1029/137gm08.

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Actes de conférences sur le sujet "Ice sheet and climate interactions"

1

Piccione, Gavin, Terry Blackburn, Slawek Tulaczyk, Troy Rasbury, Paul Northrup et Brandon Cheney. « SUBGLACIAL PRECIPITATES RECORD EAST ANTARCTIC ICE SHEET RESPONSE TO PLEISTOCENE CLIMATE CYCLES ». Dans GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-359728.

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Daugherty, Matt. « Epidemiological significance of vector behavior : Interactions with plant resistance traits and climate ». Dans 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.92953.

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Tarasov, Lev, Taimaz Bahadory et Marilena Sophie Geng. « THE RELATIONSHIP BETWEEN TERRESTRIAL ICE SHEET MARGINS AND MEAN SUMMER TEMPERATURE FROM FULLY COUPLED ICE AND CLIMATE MODELLING ». Dans GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-358330.

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Coll, Moshe. « Climate changes and biological pest control : From tri-trophic interactions to geographical distribution ». Dans 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.93309.

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Ding, Jianqing. « Climate warming affects biological control by shifting interactions of invasive plants and insects ». Dans 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.95034.

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Prothro, Lindsay O., Lauren M. Simkins, Wojciech Majewski et John B. Anderson. « SEDIMENTARY PROCESSES AT PALEO-GROUNDING LINES : GLACIAL AND OCEANOGRAPHIC INTERACTIONS DURING ICE-SHEET RETREAT ». Dans GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-301342.

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Ginsberg, Howard S. « Interactions of climate change with geology, infrastructure, and human demography : Implications for vectors and pathogens ». Dans 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.94698.

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Heggy, Essam. « Exploring Deserts Response to Climate Change from the Orbiting Arid Subsurface and Ice Sheet Sounder (OASIS) ». Dans IGARSS 2021 - 2021 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2021. http://dx.doi.org/10.1109/igarss47720.2021.9553810.

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Powell, Evelyn, Robert P. Ackert, Christine Burrill, Matthew J. Zimmerer, Konstantin Latychev, Jerry X. Mitrovica et James Davis. « ANTARCTIC ICE SHEET AND SOLID EARTH INTERACTIONS : IMPLICATIONS FOR MANTLE VISCOSITY INFERENCES AND WEST ANTARCTIC VOLCANISM ». Dans GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-383552.

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Ahmed, Aziz, M. Abdullah Al Maruf, Arun Kr Dev et Mohammed Abdul Hannan. « Preliminary Analytical Formulation of Ice-Floater Interactions Including the Effect of Wave Load ». Dans ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78340.

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Diminishing ice presence in the Arctic provides the potential for extended operable period for oil and gas exploration in the Arctic. Floaters are a flexible solution for such scenario whereas they can fully take advantage of the extended drilling season as well as operate in other harsh environment regions during the off-season. Such floaters can disconnect and reconnect to avoid large ice features such as icebergs and multi-year ice ridges. However, they still need to encounter relatively large level ice. Accompanying icebreakers will ideally assist in breaking the level ice into manageable pieces. The interaction of such level ice floes with floater has a significant influence on the dynamic ice load on the floater and resulting mooring load. There is significant uncertainty in the simulation of level ice-floater interaction numerically. Most of the current research focuses on the influence of ice breaking and subsequent flow of the broken ice around the floater. However, the hydrodynamic load due to the incoming level ice will also affect the response of the floater, which is usually not simulated. A recent study simulated the multibody hydrodynamics of level ice and floater Such multibody hydrodynamic analysis is computationally expensive, and complexity in the modelling is a hindrance to its implementation in the design phase. The present study, therefore, employs a conservative estimation to include the effect of wave load on the floater in addition to the ice load. Parametric studies are performed to estimate this effect by varying the incoming wave amplitude and wave period, ice sheet thickness, ice drift velocity, floater’s hull angle, mooring stiffness and the distance of large ice-sheet from the floater. Significant impacts of waves on the floater in terms of total force are observed which clearly reflects the importance of this study. The effect of mooring stiffness on total load is also investigated at the end of this study which can be considered as a foundation for further research on optimizing the mooring stiffness for such kind of arctic floater.
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Rapports d'organisations sur le sujet "Ice sheet and climate interactions"

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Cenedese, Claudia, et Mary-Louise Timmermans. 2017 program of studies : ice-ocean interactions. Woods Hole Oceanographic Institution, novembre 2018. http://dx.doi.org/10.1575/1912/27807.

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The 2017 Geophysical Fluid Dynamics Summer Study Program theme was Ice-Ocean Interactions. Three principal lecturers, Andrew Fowler (Oxford), Adrian Jenkins (British Antarctic Survey) and Fiamma Straneo (WHOI/Scripps Institution of Oceanography) were our expert guides for the first two weeks. Their captivating lectures covered topics ranging from the theoretical underpinnings of ice-sheet dynamics, to models and observations of ice-ocean interactions and high-latitude ocean circulation, to the role of the cryosphere in climate change. These icy topics did not end after the first two weeks. Several of the Fellows' projects related to ice-ocean dynamics and thermodynamics, and many visitors gave talks on these themes.
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Jeffery, Nicole. Ice-ocean interactions, marine biogeochemistry and the climate system. Office of Scientific and Technical Information (OSTI), mai 2017. http://dx.doi.org/10.2172/1358151.

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Heimbach, Patrick. Predicting Ice Sheet and Climate Evolution at Extreme Scales. Office of Scientific and Technical Information (OSTI), février 2016. http://dx.doi.org/10.2172/1237286.

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Gunzburger, Max, et Lili Ju. PISCEES : Predicting Ice Sheet and Climate Evolution at Extreme Scales. Office of Scientific and Technical Information (OSTI), décembre 2017. http://dx.doi.org/10.2172/1412072.

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Sacks, William, Brian Kauffman et Mariana Vertenstein. Predicting Ice Sheet and Climate Evolution on Extreme Scales (PISCEES) Final Report. Office of Scientific and Technical Information (OSTI), septembre 2018. http://dx.doi.org/10.2172/1468820.

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Salinger, Andrew G., Irina Kalashnikova Tezaur, Mauro Perego, Raymond Tuminaro et Stephen Price. Rapid development of an ice sheet climate application using the components-based approach. Office of Scientific and Technical Information (OSTI), octobre 2015. http://dx.doi.org/10.2172/1222925.

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Ju, Lili, et Max Gunzburger. Final Technical Report -- PISCEES : Predicting Ice Sheet and Climate Evolution at Extreme Scales. Office of Scientific and Technical Information (OSTI), décembre 2017. http://dx.doi.org/10.2172/1411121.

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Asay-Davis, Xylar. Final Report. Coupled simulations of Antarctic Ice-sheet/ocean interactions using POP and CISM. Office of Scientific and Technical Information (OSTI), décembre 2015. http://dx.doi.org/10.2172/1233439.

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Kim, Grace, Stefanie Mack et Daniel Kaufman. Combining artificial intelligence, Earth observations, and climate models to improve predictability of ice-biogeochemistry interactions. Office of Scientific and Technical Information (OSTI), avril 2021. http://dx.doi.org/10.2172/1769689.

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Asay-Davis, Xylar Storm. Final Report : Modeling coupled ice sheet-ocean interactions in the Model for Prediction Across Scales (MPAS) and in DOE Earth System Models. Office of Scientific and Technical Information (OSTI), janvier 2019. http://dx.doi.org/10.2172/1490084.

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