Influence of subglacial geology on the onset of a West Antarctic ice stream from aerogeophysical observations PDF Download

Author: R.E. BELL
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: S. ANANDAKRISHNAN
Publisher:
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Category :
Languages : en
Pages :

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Publisher: American Geophysical Union
ISBN:
Category : Geology
Languages : en
Pages : 297

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Author: Marion Bougamont
Publisher:
ISBN:
Category : Glaciology
Languages : en
Pages : 288

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Author: Martin J. Siegert
Publisher: John Wiley & Sons
ISBN: 1118671481
Category : Science
Languages : en
Pages : 642

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Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 192. Antarctic Subglacial Aquatic Environments is the first volume on this important and fascinating subject. With its underlying theme of bridging existing knowledge to future research, it is a benchmark in the history of subglacial lake exploration and study, containing up-to-date discussions about the history and background of subglacial aquatic environments and future exploration. The main topics addressed are identification, location, physiography, and hydrology of 387 subglacial lakes; protocols for environmental stewardship and protection of subglacial lake environments; details of three programs aiming to explore Vostok Subglacial Lake, Ellsworth Subglacial Lake, and Whillans Subglacial Lake over the next 3–5 years; assessment of technological requirements for exploration programs based on best practices for environmental stewardship and scientific success; and knowledge of subglacial lakes as habitats for microbial life and as recorders of past climate and ice sheet change. Its uniqueness, breadth, and inclusiveness will appeal to microbiologists and those interested in life in extreme environments, paleoclimatologists and those interested in sedimentary records of past changes, glaciologists striving to understand how water beneath glaciers affects their flow, and those engaged in developing technology to undertake direct measurement and sampling of extreme environments on Earth and in the solar system.

Author: Ulrich Harms
Publisher: Springer Science & Business Media
ISBN: 3540687785
Category : Science
Languages : en
Pages : 372

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This volume provides a review and synthesizes the accomplishments of the past decade of the International Continental Scientific Drilling Program. More importantly, it defines opportunities for scientific advancement through future drilling projects addressing a broad range of disciplines in the Earth Sciences. In addition there is a review of all past projects that were supported by the ICDP, as well as of technical aspects associated with continental drilling.

Author: Konrad Steffen
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 502

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Author: Niels Grobbe
Publisher: John Wiley & Sons
ISBN: 1119127408
Category : Science
Languages : en
Pages : 496

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Seismoelectric coupling and its current and potential future applications The seismoelectric method—the naturally-occurring coupling of seismic waves to electromagnetic fields—can provide insight into important properties of porous media. With a variety of potential environmental and engineering uses, as well as larger scale applications such as earthquake detection and oil and gas exploration, it offers a number of advantages over conventional geophysical methods. Seismoelectric Exploration: Theory, Experiments, and Applications explores the coupling between poroelastic and electromagnetic disturbances, discussing laboratory experiments, numerical modeling techniques, recent theoretical developments, and field studies. Volume highlights include: Physics of the seismoelectric effect at the microscale Governing equations describing coupled seismo-electromagnetic fields Examples of successful seismoelectric field experiments in different geological settings Current and potential applications of seismoelectric coupling Noise removal techniques for seismoelectric field measurements The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.

Author: Narelle Paula Marie Baker
Publisher:
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Category :
Languages : en
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Subglacial hydrology is known to influence the flow of ice. However, difficulty in accessing the base of large ice sheets has made determining the interaction between ice streams, basal sediment and water difficult to discern. The aim of this thesis is to determine the influence of subglacial hydrology on the flow of the West Antarctic ice streams. This is achieved through development of a numerical flowline model, the Hydrology, Ice and Till (HIT) model. Ice thermodynamics are coupled to a till layer of Coulomb plastic rheology. The porosity of the till changes with basal melt and freeze and can be augmented by water transported through a subglacial conduit system. Water availability strongly affects ice flow, as till porosity influences the till failure strength and thereby the basal resistance of the ice. The model was developed in four stages and a number of sensitivity tests were performed. It was then applied to Kamb Ice Stream (Ice Stream C) and Whillians Ice Stream (Ice Stream B), West Antarctica. Results confirm that ice streams are capable of oscillating between fast and slow velocity states. Cycles are generated at the grounding line of an ice stream and the speed of the transition from slow to fast flow is governed by water availability. The period of oscillation of the cycles for the West Antarctic ice streams was found to be several hundred years, which is in line with observations of stagnation and reactivation of these ice streams. This shows that subglacial hydrology has a role in modulating the flow variability of ice streams and that rather large changes in the flow of the West Antarctic ice streams are likely to occur this century.

Author: John Bliese
Publisher: Routledge
ISBN: 0429976119
Category : Social Science
Languages : en
Pages : 341

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Is ?conservative environmentalism? an oxymoron? Is more environmental regulation good for business? The Greening of Conservative America contends that the adherents to any well-considered conservative political philosophy should, on first principles, support pro-conservation, pro-environment policies. Furthermore, and pragmatically, Bliese demonstrates with repeated examples how environmental protection policies actually benefit business by stimulating greater efficiency and innovation and by spurring the creation of green products and services for new markets around the globe. These ideas are applied in chapters on specific environmental issues, including pollution, global warming, biodiversity, public-land management, and sustainability. The book concludes with criticisms of ?free-market environmentalism? and calls conservatives back to their root principles on matters of the environment. Concerned citizens of any political persuasion will find much in this book to inform their views on public debates over environmental issues and policies.