Proglacial Lake Evolution in an Ice Marginal Landscape PDF Download

Author: Morgan D. Holt
Publisher:
ISBN:
Category :
Languages : en
Pages : 204

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Author: Tobias Heckmann
Publisher: Springer
ISBN: 3319941844
Category : Science
Languages : en
Pages : 352

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This book discusses the recession of alpine glaciers since the end of the Little Ice Age (LIA), which has been accelerating in the past decades. It provides an overview of the research in the field, presenting definitions and information about the different proglacial areas and systems. A number of case studies are from the PROSA project group which encompasses the expertise of geomorphologists, geologists, glaciologists and geodesists. The PROSA joint project (High-resolution measurements of morphodynamics in rapidly changing PROglacial Systems of the Alps) is determined to tackle the problems of geomorphic activity on sediment export through a quantification of sediment fluxes effected by the aforementioned geomorphic processes within the forefield of the Gepatschferner glacier (Central Alps, Austria).

Author: Jeremy B. Jones
Publisher: Elsevier
ISBN: 0124059198
Category : Science
Languages : en
Pages : 566

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Book Description
Stream Ecosystems in a Changing Environment synthesizes the current understanding of stream ecosystem ecology, emphasizing nutrient cycling and carbon dynamics, and providing a forward-looking perspective regarding the response of stream ecosystems to environmental change. Each chapter includes a section focusing on anticipated and ongoing dynamics in stream ecosystems in a changing environment, along with hypotheses regarding controls on stream ecosystem functioning. The book, with its innovative sections, provides a bridge between papers published in peer-reviewed scientific journals and the findings of researchers in new areas of study. - Presents a forward-looking perspective regarding the response of stream ecosystems to environmental change - Provides a synthesis of the latest findings on stream ecosystems ecology in one concise volume - Includes thought exercises and discussion activities throughout, providing valuable tools for learning - Offers conceptual models and hypotheses to stimulate conversation and advance research

Author: Victoria Helen Brown
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Ice streams drain ice sheets rapidly and are key regulators of their mass balance in both palaeo and contemporary settings. Present day ice streams can be identified, and their short-term activity monitored, by measuring the surface velocity of ice sheets. However, in order to understand their long-term behaviour, reconstructions of their activity in palaeo-ice sheets are necessary. Numerous palaeo-ice streams have been identified in the Laurentide Ice Sheet (LIS) and this has considerably refined our understanding of its dynamic behaviour and links to the ocean-climate system. In the north-west sector of the LIS, ice streaming has been hypothesised but detailed mapping of the area has not been carried out and so our understanding of palaeo-ice streaming is limited compared to other areas. This thesis presents a new ice sheet reconstruction of the north-west sector of the LIS that incorporates ice stream activity and pro-glacial lake evolution. Mapping and analysis was carried out using a range of remote sensing imagery and Digital Elevation Models (DEMs), which enabled widespread, rapid and systematic coverage of the 800,000 km2 study area. More than 95,000 bedforms have been mapped, including glacial lineations, eskers, moraines and palaeo-channels. These data permit the identification and classification of 272 flow-sets which have been dated using an existing 14C database and relative cross-cutting relationships. Flow-sets are used to construct a robust and self-consistent ice sheet reconstruction, incorporating the activity of ice streams at a temporal resolution of up to 250-500 years. The reconstruction reveals major changes in ice sheet configuration during Late Wisconsinan deglaciation and indicates that margin retreat was complex and dominated by the dynamic spatial and temporal evolution of seven ice stream systems. These ice streams were not synchronous but a peak in their activity occurred between 15 and 13 ka. Their location and behaviour was influenced by the availability of soft sediments, but their temporal switching was likely controlled by sub-glacial meltwater routing and ice piracy. Large proglacial lakes developed during deglaciaton but their evolution did not appear to control ice stream activity, as observed elsewhere in the ice sheet. However, major palaeo-channels are consistent with a previously hypothesised north-west drainage route for Glacial Lake Agassiz.

Author: David Palacios
Publisher: Elsevier
ISBN: 0323997139
Category : Science
Languages : en
Pages : 637

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European Glacial Landscapes: The Holocene presents the current state of knowledge on glacial landscapes of Europe and nearby areas over the Holocene to deduce the influence of atmospheric and oceanic currents and the insolation forcing variability and volcanic activity on Holocene paleoclimates, the existence of asynchronies in the timing of occurrence of glacier expansion and shrinkage during the Holocene, time lags between the identification of oceanic and atmospheric changes and those occurring in glacial extension during the Holocene, the role of Holocene glaciers on the climate of Europe, and on sea level variability, and the delimitation of landscapes that need special protection. Students, academics and researchers in Geography, Geology, Environmental Sciences, Physics and Earth Science departments will find this book provides novel findings of all the major European Regions in a single publication, with updated information about Holocene glacial geomorphology and paleo-climatology and clear figures that model the landscapes covered. Provides a synthesis and summary of glacial processes in Europe over the Holocene period Features research from experts in palaeo-climatology, palaeo-oceanography and palaeo-glaciology Includes access to a companion website with an interactive map, photos of glacial features, and geospatial data related to European Glacial Landscapes

Author: David Palacios
Publisher: Elsevier
ISBN: 0323985114
Category : Science
Languages : en
Pages : 645

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Book Description
European Glacial Landscapes: Last Deglaciation brings together relevant experts on the history of glaciers and their impact on the landscape of the main European regions. Soon after the Last Glacial Maximum, a rapid process of the glacial retreat began throughout Europe. This was interrupted several times by abrupt climate cooling, which caused rapid, although moderate, re-advance of the glaciers, until the beginning of the Holocene when the climate became relatively stable and warm. These successive glacial advances and retreats during the Last Deglaciation have shaped much of the European landscape, reflecting abrupt climatic fluctuations. As our knowledge of abrupt climate changes since the Last Glacial Maximum progresses, new uncertainties arise. These are critical for understanding how climate changes disseminate through Europe, such as the lag between climate changes and the expansion or contraction of glaciers as well as the role of the large continental ice sheets on the European climate. All these contributions are included in the book, which is an invaluable resource for geographers, geologists, environmental scientists, paleoclimatologists, as well as researchers in physics and earth sciences. - Provides a synthesis that highlights the main similarities or differences, through both space and time, during the Last Deglaciation of Europe - Features research from experts in quaternary, geomorphology, palaeoclimatology, palaeoceanography and palaeoglaciology on the Last Deglaciation in Europe during Termination 1 and the important Late Pleistocene-Holocene transition - Includes detailed colour figures and maps, providing a comprehensive overview of the glacial landscapes of Europe during the last deglaciation

Author: Olav Slaymaker
Publisher: Springer
ISBN: 3319445952
Category : Science
Languages : en
Pages : 439

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This is the only book to focus on the geomorphological landscapes of Canada West. It outlines the little-appreciated diversity of Canada’s landscapes, and the nature of the geomorphological landscape, which deserves wider publicity. Three of the most important geomorphological facts related to Canada are that 90% of its total area emerged from ice-sheet cover relatively recently, from a geological perspective; permafrost underlies 50% of its landmass and the country enjoys the benefits of having three oceans as its borders: the Arctic, Pacific and Atlantic oceans. Canada West is a land of extreme contrasts — from the rugged Cordillera to the wide open spaces of the Prairies; from the humid west-coast forests to the semi-desert in the interior of British Columbia and from the vast Mackenzie river system of the to small, steep, cascading streams on Vancouver Island. The thickest Canadian permafrost is found in the Yukon and extensive areas of the Cordillera are underlain by sporadic permafrost side-by-side with the never-glaciated plateaus of the Yukon. One of the curiosities of Canada West is the presence of volcanic landforms, extruded through the ice cover of the late Pleistocene and Holocene epochs, which have also left a strong imprint on the landscape. The Mackenzie and Fraser deltas provide the contrast of large river deltas, debouching respectively into the Arctic and Pacific oceans.

Author: Joseph A. DiPietro
Publisher: Elsevier
ISBN: 0443158959
Category : Science
Languages : en
Pages : 678

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Book Description
Geology and Landscape Evolution: General Principles Applied to the United States, Third Edition is an accessible text that balances interdisciplinary theory and applications within the physical geography, geology, geomorphology and climatology of the United States. The vast diversity of terrain and landscape across the United States makes this an ideal tool for geoscientists worldwide who research the country's geological and landscape evolution. The book provides an explanation of how landscape forms and how it evolves. This edition is fully updated with 3 additional sections: Geologic and Tectonic Processes and Provinces; Surface Processes and Provinces; and Compressional Mountain Systems. Rather than limiting the coverage specifically to tectonics or to the origin and evolution of rocks with little regard for the actual landscape beyond general desert, river, and glacial features, this book concentrates specifically on the origin of the landscape itself, with specific and exhaustive references and examples from across the United States. The book goes on to apply those concepts to specific examples throughout the United States, making it a valuable resource for understanding theoretical geological concepts through a practical lens. - Presents the complexities of physical geography, geology, geomorphology and climatology of the United States through an interdisciplinary, highly accessible approach - Offers hundreds of figures, maps and photographs that capture the systematic interaction of land, rock, rivers, glaciers, global wind patterns and climate, including Google Earth images - Provides a thorough assessment of the logic, rationale, and tools required to understand how to interpret landscape and the geological history of the Earth - Features exercises that conclude each chapter, aiding in the retention of key concepts - Includes 3 new sections and 8 additional chapters, as well as major updates to chapters throughout

Author: Jeffrey S. Kargel
Publisher: Springer
ISBN: 3540798188
Category : Technology & Engineering
Languages : en
Pages : 936

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An international team of over 150 experts provide up-to-date satellite imaging and quantitative analysis of the state and dynamics of the glaciers around the world, and they provide an in-depth review of analysis methodologies. Includes an e-published supplement. Global Land Ice Measurements from Space - Satellite Multispectral Imaging of Glaciers (GLIMS book for short) is the leading state-of-the-art technical and interpretive presentation of satellite image data and analysis of the changing state of the world's glaciers. The book is the most definitive, comprehensive product of a global glacier remote sensing consortium, Global Land Ice Measurements from Space (GLIMS, http://www.glims.org). With 33 chapters and a companion e-supplement, the world's foremost experts in satellite image analysis of glaciers analyze the current state and recent and possible future changes of glaciers across the globe and interpret these findings for policy planners. Climate change is with us for some time to come, and its impacts are being felt by the world's population. The GLIMS Book, to be released about the same time as the IPCC's 5th Assessment report on global climate warming, buttresses and adds rich details and authority to the global change community's understanding of climate change impacts on the cryosphere. This will be a definitive and technically complete reference for experts and students examining the responses of glaciers to climate change. World experts demonstrate that glaciers are changing in response to the ongoing climatic upheaval in addition to other factors that pertain to the circumstances of individual glaciers. The global mosaic of glacier changes is documented by quantitative analyses and are placed into a perspective of causative factors. Starting with a Foreword, Preface, and Introduction, the GLIMS book gives the rationale for and history of glacier monitoring and satellite data analysis. It includes a comprehensive set of six "how-to" methodology chapters, twenty-five chapters detailing regional glacier state and dynamical changes, and an in-depth summary and interpretation chapter placing the observed glacier changes into a global context of the coupled atmosphere-land-ocean system. An accompanying e-supplement will include oversize imagery and other other highly visual renderings of scientific data.

Author: Matti Leppäranta
Publisher: Springer
ISBN: 9783031256073
Category : Science
Languages : en
Pages : 0

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This book updates the first edition for the status of knowledge in the physics of lake ice and the interactions between the ice cover and the liquid water underneath. Since the first edition was written in 2013, there has been a lot of progress in the field, in particular concerning environmental questions and the impact of climate change. Life conditions in ice-covered lakes and practical matters are now brought more into the picture so that the revision also properly serves as a handbook for applications. The author has worked widely with boreal lakes, polar lakes and Central Asian lakes that provides a wide geographical spectrum. Chapter 1 gives a brief overview and presents the research fields. The second chapter contains the classification of ice-covered lakes and observation techniques, especially remote sensing. In Chapter 3, the structure and properties of lake ice are presented including optics and geochemistry. Ice growth and melting are treated in Chapter 4, while the following chapter focuses on ice mechanics with applications to traffic on ice and ice loads. Chapter 6 goes into the exotic environment of pro-glacial lakes. Chapter 7 contains the stratification and circulation of the water body beneath lake ice, Chapter 8 presents the winter ecology of freezing lakes and discusses the lake ice interface toward the society, and Chapter 9 summarizes the climate change impact on lake ice seasons. The book ends into a brief closing chapter and list of references. Research problems for student learning are listed throughout the book. Annexes are included to provide numerical data of constants and standard formulae to help practical calculations and student tasks. Lake ice closely interacts with human living conditions, but people have learnt to live with that and to utilize the ice. In the present time this is true for on-ice traffic and recreation activities. Ice fishing has become a widely enjoyed hobby, and winter sports such as skiing, skating,and ice sailing are popular activities on frozen lakes. The lake ice response to eventual climate warming would appear as a shortening of the ice season due to the increasing air temperature and also as changing of the quality of the ice seasons via changes in ice thickness and structure. The book gives the whole story of lake ice into a single volume. The second, revised edition updates the content based on recent progress in winter limnology and ice physics research and applications. The author has contributed to lake ice research since the 1980s. In particular, his topics have been lake ice structure and thermodynamics, light transfer in ice and snow, ice mechanics in large lakes, and lake ice climatology. Mathematical modeling of ice growth, drift, and decay are covered in this research.