Impact Of Glacio Lacustrine Interactions On Ice Sheet Dynamics

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Impact of Glacio-lacustrine Interactions on Ice-sheet Dynamics

Author : Sebastian Hinck
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Impact of Glacio-lacustrine Interactions on Ice-sheet Dynamics by : Sebastian Hinck

Download or read book Impact of Glacio-lacustrine Interactions on Ice-sheet Dynamics written by Sebastian Hinck and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet's geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake-ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay.

Ice Composition and Glacier Dynamics

Author : Roland A. Souchez
Publisher : Springer Science & Business Media
ISBN 13 : 3642581870
Total Pages : 304 pages
Book Rating : 4.6/5 (425 download)

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Book Synopsis Ice Composition and Glacier Dynamics by : Roland A. Souchez

Download or read book Ice Composition and Glacier Dynamics written by Roland A. Souchez and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ice composition has until now been mostly used for reconstructing the environment of the past. A great research effort is made today to model the climate system in which the ice cover at the earth sur face plays a prominent role. To obtain a correct model of the ice sheets, due attention must be paid to the physical processes operating at the interfaces, i. e. the boundary conditions. The idea behind the title of this book is that the study of ice composition can shed some light on the various processes operating at the ice bedrock and ice-ocean interfaces and more generally on glacier dy namics. The book is not intended as a treatise on some specialized topic of glaciology. It is mainly the product of the experience of the two authors gained over several years research on the subject. The two authors are both members of the same university department and personal friends. The book was prepared in the following way. After a first draft of the complete book had been written by the first author, it was put in the hands of the second. The final version sent to the publishers is therefore the result of ex tended discussion, while at the same time preserving the unity of style that would have been lost had the two authors written selected chapters of the book individually. The book is organized into two distinct parts.

Modern Glacial Environments

Author : John Menzies
Publisher : Butterworth-Heinemann
ISBN 13 :
Total Pages : 656 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Modern Glacial Environments by : John Menzies

Download or read book Modern Glacial Environments written by John Menzies and published by Butterworth-Heinemann. This book was released on 1995 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text considers the cause of glaciation, ice sheet modelling, glacial physics, hydrology, processes of erosion, transportation, deposition and glaciotectonism. Other chapters cover modern proglacial, supraglacial, glaciolacustrine and glaciomarine environments.

Antarctic Climate Evolution

Author : Fabio Florindo
Publisher : Elsevier
ISBN 13 : 0080931618
Total Pages : 606 pages
Book Rating : 4.0/5 (89 download)

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Book Synopsis Antarctic Climate Evolution by : Fabio Florindo

Download or read book Antarctic Climate Evolution written by Fabio Florindo and published by Elsevier. This book was released on 2008-10-10 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antarctic Climate Evolution is the first book dedicated to furthering knowledge on the evolution of the world's largest ice sheet over its ~34 million year history. This volume provides the latest information on subjects ranging from terrestrial and marine geology to sedimentology and glacier geophysics. - An overview of Antarctic climate change, analyzing historical, present-day and future developments - Contributions from leading experts and scholars from around the world - Informs and updates climate change scientists and experts in related areas of study

Contemporary Ice-sheet Dynamics: Ocean Interaction, Meltwater and Non-linear Effects

Author : Anthony J. Payne
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (968 download)

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Book Synopsis Contemporary Ice-sheet Dynamics: Ocean Interaction, Meltwater and Non-linear Effects by : Anthony J. Payne

Download or read book Contemporary Ice-sheet Dynamics: Ocean Interaction, Meltwater and Non-linear Effects written by Anthony J. Payne and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Glacier-Permafrost Interactions

Author : Richard I. Waller
Publisher : John Wiley & Sons
ISBN 13 : 1118620984
Total Pages : 325 pages
Book Rating : 4.1/5 (186 download)

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Book Synopsis Glacier-Permafrost Interactions by : Richard I. Waller

Download or read book Glacier-Permafrost Interactions written by Richard I. Waller and published by John Wiley & Sons. This book was released on 2024-07-01 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glacier-Permafrost Interactions A systematic exploration of the interactions between glaciers and permafrost In Glacier-Permafrost Interactions, experienced glaciologist Richard I. Waller delivers a comprehensive discussion of the interactions between glaciers and permafrost. The book is highly relevant to contemporary debates regarding ongoing recession of glaciers and the degradation of permafrost in the face of global warming. By integrating modern-era observations with findings from Quaternary science, this book demonstrates how glaciers and permafrost can interact and behave as an integrated system. This summary of the current thinking and emerging research on glacier-permafrost interaction also provides: Comprehensive discussions of permafrost in modern and ancient glacial environments A focused review of the distinctive characteristics of glaciers found in permafrost environments An integrated overview of the nature and impacts of glacier-permafrost interactions on the hydrology and dynamic behaviour of glaciers and their landscape expression A survey of current research efforts and future directions in the field Lying at the boundary between a research monograph and an advanced textbook, Glacier-Permafrost Interactions contributes to the future development of this rapidly evolving field by incorporating new approaches and ideas while still offering a summary of the current state of knowledge. It is perfect for advanced undergraduate students, postgraduate students, researchers, and professionals with an interest in polar and alpine environments.

Observations, Interactions, and Implications of Increasingly Dynamic Permafrost Coastal Systems

Author : Benjamin M. Jones
Publisher : Frontiers Media SA
ISBN 13 : 2889760243
Total Pages : 255 pages
Book Rating : 4.8/5 (897 download)

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Book Synopsis Observations, Interactions, and Implications of Increasingly Dynamic Permafrost Coastal Systems by : Benjamin M. Jones

Download or read book Observations, Interactions, and Implications of Increasingly Dynamic Permafrost Coastal Systems written by Benjamin M. Jones and published by Frontiers Media SA. This book was released on 2022-04-28 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Dynamics of Ice Sheets and Glaciers

Author : Ralf Greve
Publisher : Springer Science & Business Media
ISBN 13 : 3642034152
Total Pages : 300 pages
Book Rating : 4.6/5 (42 download)

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Book Synopsis Dynamics of Ice Sheets and Glaciers by : Ralf Greve

Download or read book Dynamics of Ice Sheets and Glaciers written by Ralf Greve and published by Springer Science & Business Media. This book was released on 2009-08-07 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Ice Sheets and Glaciers presents an introduction to the dynamics and thermodynamics of flowing ice masses on Earth. Based on an outline of general continuum mechanics, the different initial-boundary-value problems for the flow of ice sheets, ice shelves, ice caps and glaciers are systematically derived. Special emphasis is put on developing hierarchies of approximations for the different systems, and suitable numerical solution techniques are discussed. A separate chapter is devoted to glacial isostasy. The book is appropriate for graduate courses in glaciology, cryospheric sciences, environmental sciences, geophysics and related fields. Standard undergraduate knowledge of mathematics (calculus, linear algebra) and physics (classical mechanics, thermodynamics) provide a sufficient background for successfully studying the text.

On Sea Level - Ice Sheet Interactions

Author : Natalya Alissa Gomez
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (874 download)

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Book Synopsis On Sea Level - Ice Sheet Interactions by : Natalya Alissa Gomez

Download or read book On Sea Level - Ice Sheet Interactions written by Natalya Alissa Gomez and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Dynamics of Snow and Ice Masses

Author : Samuel C. Colbeck
Publisher : Elsevier
ISBN 13 : 0323148891
Total Pages : 479 pages
Book Rating : 4.3/5 (231 download)

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Book Synopsis Dynamics of Snow and Ice Masses by : Samuel C. Colbeck

Download or read book Dynamics of Snow and Ice Masses written by Samuel C. Colbeck and published by Elsevier. This book was released on 2012-12-02 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Snow and Ice Masses gives an outline of snow and ice studies with an emphasis on essential properties and processes. The monograph also treats the dynamical aspects of snow and ice masses. The text covers topics such as the flow and temperature of ice sheets and shelves, the numerical modeling of ice-sheet changes; the structure of glaciers, the experimental creep behavior of ice, flow law of glacier ice, and advance and retreat of glaciers. Also covered are topics such as sea ice - the physics of its growth, drift, and decay; iceberg deterioration, sources, drift, and drift patterns; and freshwater ice growth, motion, and decay. The book is recommended as a textbook for graduate-level students of snow and ice studies and as reference for climatologists.

Ice Sheets and Late Quaternary Environmental Change

Author : Martin J. Siegert
Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Ice Sheets and Late Quaternary Environmental Change by : Martin J. Siegert

Download or read book Ice Sheets and Late Quaternary Environmental Change written by Martin J. Siegert and published by John Wiley & Sons. This book was released on 2001-04-11 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ice Sheets and Late Quaternary Environmental Change provides a detailed account of the temporal and spatial distribution of ice sheets during the last ice age, and how these ice masses interacted with the environment. This is the first book in 20 years to detail the sizes of ice sheets during the last glaciation and the first to discuss their role in past climate change. Arranged in two parts, the first part provides the tools required for evaluating past ice sheets while the second part uses these tools to establish the size, extent and dynamics of late Quaternary ice sheets. Assuming no prior knowledge of Quaternary Science, the discussion progresses from the basic principles of how and why ices ages occur, to the interpretation of proxy records of past climate and ocean change. Instructive accounts of how the geological record can be used as evidence of former ice sheet behaviour and a discussion on the role of numerical models in understanding interaction between ice sheets, oceans and the atmosphere are included in this book. Details of former ice sheets are presented by geographical region along with a number of critical new theories on their size and behaviour. This book would appeal to 2nd/3rd year students of Quaternary Science, most University Geography, Earth Science or Geology departments, as well as researchers and academics in Quaternary Science.

Fundamentals of Glacier Dynamics

Author : C.J. van der Veen
Publisher : CRC Press
ISBN 13 : 1439835675
Total Pages : 399 pages
Book Rating : 4.4/5 (398 download)

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Book Synopsis Fundamentals of Glacier Dynamics by : C.J. van der Veen

Download or read book Fundamentals of Glacier Dynamics written by C.J. van der Veen and published by CRC Press. This book was released on 2013-03-26 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change Fourth Assessment Report (2007) acknowledged that current ice sheet models do not adequately treat the dynamic response of ice sheets to climate change. This second edition addresses these issues through the addition of new chapters covering glacier instabilities, the interpretation of observations, and ice sheets and sea level. Another new chapter covers glacier mass balance. The text also provides the necessary background and theoretical foundation for developing more realistic ice sheet models, which is essential for better integration of data and observations as well as for better model development.

On Modelling and Physics of Ice-age Ice Sheet-sea Level-solid Earth Interactionslevel-solid Earth Interactions

Author : Kyeore Han
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)

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Book Synopsis On Modelling and Physics of Ice-age Ice Sheet-sea Level-solid Earth Interactionslevel-solid Earth Interactions by : Kyeore Han

Download or read book On Modelling and Physics of Ice-age Ice Sheet-sea Level-solid Earth Interactionslevel-solid Earth Interactions written by Kyeore Han and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The retreat and advance of ice sheets perturb the Earth's solid surface, gravitational field and rotation, leading to spatially and temporally varying changes in the elevation of the ocean surface and solid Earth and hence sea level (glacial isostatic adjustment; GIA). Modelling studies have shown that sea-level changes associated with GIA in turn feed back onto ice sheets, confirming the coupled nature of ice sheets, the solid Earth and sea level. These interactions occur over a range of timescales (from decadal to multi-millennial and longer) and have important implications for ice sheet stability and sensitivity to climate changes in marine and terrestrial settings. Understanding the physics of these interactions through the Earth's glacial history is pertinent to interpreting ice-sheet and sea-level records from the past, understanding ongoing changes and projecting future climate changes.This thesis expands 1) the understanding of the history and physics of coupled ice-sheet and sea-level changes in the Northern Hemisphere over the last glacial cycle and 2) the computational capability of coupled ice-sheet - sea-level modelling. In the first study, I apply a sea-level model to simulate gravitationally consistent sea-level changes in North America associated with ice melting through the last deglaciation (21-6 thousand years ago). I separate the ice and water loading signals from periods during active deglaciation and post-deglaciation phases and show how these signals lead to a possible bias in interpreting geophysical records used to constrain the viscosity underlying mantle in the Hudson Bay region. I also identify sites where the bias is minimized in the region.In the second study, I explore how deformation of the solid Earth and perturbations of the gravitational field impacted the evolution of ice sheets in the Northern Hemisphere during the last glacial cycle using a coupled ice-sheet - sea-level model. I demonstrate that solid Earth deformation enhances the dynamics of the Northern Hemispheric ice sheets, causing greater fluctuations of ice sheets in North America and Eurasia throughout the glacial cycle and that gravitational perturbations influence the stability of marine-based sectors of ice on decadal to centennial timescales.Finally, I develop a novel "time window" algorithm in a sea-level model to replace the classic algorithm of temporal discretization of the ice history in the model. This algorithm improves the computational efficiency of the model and thus allows for capturing the short-term scale interactions between ice sheets, solid Earth and sea level within glacial-cycle scale simulations with a coupled ice sheet - sea level model. I apply the new algorithm to simulate ice-sheet and sea-level variations globally over the past two glacial cycles and the future retreat of the Antarctic Ice Sheet due to anthropogenic climate warming between 1950-2500 CE. I show that using the time window algorithm reduces the total CPU calculation times by at least by 50% in both cases.Overall, I contribute to expanding the understanding of the interactions between GIA and ice sheets over broader spatiotemporal scales"--

Past to Future and Land to Sea: Constraining Global Glacier Models by Observations and Exploring Ice-ocean Interactions

Author : Jan-Hendrik Malles
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)

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Book Synopsis Past to Future and Land to Sea: Constraining Global Glacier Models by Observations and Exploring Ice-ocean Interactions by : Jan-Hendrik Malles

Download or read book Past to Future and Land to Sea: Constraining Global Glacier Models by Observations and Exploring Ice-ocean Interactions written by Jan-Hendrik Malles and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glacier mass loss is an iconic process induced by anthropogenic climate change. It threatens human livelihood at coasts affected by the rising sea level and in glacierized hydrological basins where the glacial runoff is essential for water availability. Moreover, as glacier mass loss adds large amounts of freshwater to the oceans, it might alter ocean circulation in a way that affects marine ecosystems and the climate system. Only recently, satellite-data processing revealed mass changes on an individual glacier level (outside the large ice sheets), but only for the last two decades. Glacier mass change observations become increasingly sparse going back in time. Therefore, the glaciers' past contribution to global mean sea level rise can only be reconstructed using numerical models. Since glacier mass change will continue during this century, it is vital to understand how this will affect global mean sea level, ocean circulation, and regional hydrology. Again, this is only possible using numerical models. Hence, it is essential to improve these models by incorporating previously neglected processes of glacier mass change into them, mainly in the form of parametrizations, and by constraining them using observations. Moreover, it is crucial to understand the uncertainties of results produced by numerical models, as they can never fully represent the natural world, which also hinges on the amount and quality of observational data. This work will tackle aspects of three issues in numerically modeling glacier mass changes: past glacier mass change reconstructions' uncertainties, future mass change projections' uncertainties, specifically regarding marine-terminating glaciers, and ice-ocean interactions in the northern hemisphere outside the Greenland ice sheet. All three issues are relevant in addressing the question of how glaciers respond to changes in their mass balance due to climatic changes and what consequences such changes have for the Earth system and, ultimately, human livelihood. It is found that the further outside the glaciological and meteorological observations' spatial and temporal domain a numerical model is applied, the more uncertain reconstructed glacier mass changes become. Similarly, one primary source of uncertainty in future glacier mass change projections is the difference in climate models' outputs of near-surface temperatures and precipitation. More accurately describing marine-terminating glacier dynamics and considering volume changes below sea level reduces estimates of future glacier contribution to global mean sea level rise systematically. However, significant uncertainties due to uncertainty about appropriate values for parameters involved in modeling (marine-terminating) glaciers' dynamics are detected. Concerning ice-ocean interactions, it was found that including the freshwater input from glacier mass loss in the northern hemisphere (outside the Greenland ice sheet) in an ocean general circulation model significantly impacts the simulated high-latitude ocean circulation. Finally, a first estimate of the ice mass glaciers lose due to melting directly into the ocean was produced.

Wobbly Winds in an Ice Age

Author : Gerard Hugh Roe
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (438 download)

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Book Synopsis Wobbly Winds in an Ice Age by : Gerard Hugh Roe

Download or read book Wobbly Winds in an Ice Age written by Gerard Hugh Roe and published by . This book was released on 1999 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ice Sheets and Climate

Author : Johannes Oerlemans
Publisher : Springer
ISBN 13 : 9789400963276
Total Pages : 218 pages
Book Rating : 4.9/5 (632 download)

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Book Synopsis Ice Sheets and Climate by : Johannes Oerlemans

Download or read book Ice Sheets and Climate written by Johannes Oerlemans and published by Springer. This book was released on 2011-11-12 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate modelling is a field in rapid development, and the fltudy of cryospheric processes has become an important part of it. On smaller time scales, the effect of snow cover and sea ice on the atmospheric circulation is of concern for long-range weather forecasting. Thinking in decades or centuries, the effect of a C02 climatic warming on the present-day ice sheets, and the resulting changes in global sea level, has drawn a lot of attention. In particular, the dynamics of marine ice sheets (ice sheets on a bed that would be below sea level after removal of ice and full isostatic rebound) is a subject of continuous research. This interest stems from the fact that the West Antarctic Ice Sheet is a marine ice sheet which, according to some workers, may be close to a complete collapse. The Pleistocene ice ages, or glacial cycles, are best characterized by total ice volume on earth, indicating that on 4 5 large time scales (10 to 10 yr) ice sheets are a dominant component of the climate system. The enormous amount of paleoclimatic information obtained from deep-sea sediments in the last few decades has led to a complete revival of iriterest in the physical aspects of the Pleistocene climatic evolution.

Glaciers and Ice Sheets in the Climate System

Author : Andrew Fowler
Publisher :
ISBN 13 : 9783030425838
Total Pages : 0 pages
Book Rating : 4.4/5 (258 download)

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Book Synopsis Glaciers and Ice Sheets in the Climate System by : Andrew Fowler

Download or read book Glaciers and Ice Sheets in the Climate System written by Andrew Fowler and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our realisation of how profoundly glaciers and ice sheets respond to climate change and impact sea level and the environment has propelled their study to the forefront of Earth system science. Aspects of this multidisciplinary endeavour now constitute major areas of research. This book is named after the international summer school held annually in the beautiful alpine village of Karthaus, Northern Italy, and consists of twenty chapters based on lectures from the school. They cover theory, methods, and observations, and introduce readers to essential glaciological topics such as ice-flow dynamics, polar meteorology, mass balance, ice-core analysis, paleoclimatology, remote sensing and geophysical methods, glacial isostatic adjustment, modern and past glacial fluctuations, and ice sheet reconstruction. The chapters were written by thirty-four contributing authors who are leading international authorities in their fields. The book can be used as a graduate-level textbook for a university course, and as a valuable reference guide for practising glaciologists and climate scientists.