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Geochronological Constraints On The Greenland And Laurentide Ice Sheets
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Book Synopsis Geochronological Constraints on the Greenland and Laurentide Ice Sheets by : Elizabeth Grayce Ceperley
Download or read book Geochronological Constraints on the Greenland and Laurentide Ice Sheets written by Elizabeth Grayce Ceperley and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: When and how quickly the Greenland Ice Sheet (GIS) will retreat and raise sea levels is one of the most pressing societal issues. Reconstructing past ice sheet configurations and extent is imperative for predicting its response to future warming. In this dissertation, three studies add new constraints to past configurations of the GIS and the Laurentide Ice Sheet (LIS) of North America. All three studies apply the geochronometer Beryllium-10 cosmogenic nuclide surface exposure dating to calculate a duration of exposure for erratic boulders deposited by the GIS and the LIS. In Chapter 1, cosmogenic exposure dating is applied to 16 boulders on the Arnott Moraine in central Wisconsin to constrain the deposition of the moraine by the LIS, approximating the age be ~35,000 years old, just before the global Last Glacial Maximum (LGM) (26,000-19,000 years ago). These results indicate that preceding the LGM the LIS grew to an extent slightly larger than during the LGM, when sea level was thought to be ~30 m higher than during the LGM. This research adds new constraints on past ice sheet size relative to sea level, which is an important connection in the climate system. This research also applies a landscape diffusion model to the modern moraine relief and predicts that permafrost conditions during the LGM contributed to the moraine's diffuse morphology. In Chapter 2, the timing of deglaciation of the northwestern sector of GIS is investigated by applying cosmogenic surface exposure dating to erratic boulders across Washington Land in northwest Greenland. The 71 exposure dates suggest that the northwestern sector of the GIS retreated ~8,500 years ago, which is ~2,500 years later than regional warming seen in ice core records. The GIS gradually thinned, with higher elevation areas experiencing the latest retreat. Results from samples proximal to the Petermann Glacier suggest a retreat of ice to within its fjord 8,500 years ago. The work presented in Chapter 3 uses a subset of the exposure dates from Chapter 2, i.e. those that contained cosmogenic isotopes inherited from periods of prior exposure, and applies an additional cosmogenic isotope, 26Al. The paired isotope analysis suggests that erratic boulders in Washington Land record burial and exposure durations spanning 0.2-1.8 million years. This research suggests that the GIS experienced greatly reduced configurations relative to modern during the late Pleistocene.
Book Synopsis Glacial Rebound and Sea-level Change by : Kevin Michael Fleming
Download or read book Glacial Rebound and Sea-level Change written by Kevin Michael Fleming and published by . This book was released on 2000 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Greenland Icefields and Life in the North Atlantic by : George Frederick Wright
Download or read book Greenland Icefields and Life in the North Atlantic written by George Frederick Wright and published by . This book was released on 1896 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes excursion to Greenland in 1894 with Dr. F.A. Cook, with observations on land and sea ice, peoples, plants and animals. Discusses Pleistocene glaciation and its causes. (AB 19714).
Book Synopsis Greenland Ice Core by : Chester C. Langway
Download or read book Greenland Ice Core written by Chester C. Langway and published by American Geophysical Union. This book was released on 1985 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Start of a Glacial written by G. Kukla and published by Springer. This book was released on 1992 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Frozen Record by : Michael J. Oard
Download or read book The Frozen Record written by Michael J. Oard and published by . This book was released on 2005-01-01 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Greenland ice cores generally show only one Ice Age. Data indicates little or no movement of the ice sheets. Broadening of volcanic and beryllium spikes with depth gives evidence for a Creation-Flood model. From the author of Frozen in Time comes a technical monograph on ice core dating dealing with the origin and development of the Greenland and Antarctic ice sheets and the differences between the creation-flood and evolutionary-uniformitarian models for dating. --from publisher description.
Download or read book Frozen Annals written by W. Dansgaard and published by . This book was released on 2004 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiation Conditions on the Greenland Ice Sheet by : Thomas Konzelmann
Download or read book Radiation Conditions on the Greenland Ice Sheet written by Thomas Konzelmann and published by . This book was released on 1994 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reconstructing and Understanding How Past Warming Affected Sea Level, Ice Sheets, And Permafrost by : Roger Cameron Creel
Download or read book Reconstructing and Understanding How Past Warming Affected Sea Level, Ice Sheets, And Permafrost written by Roger Cameron Creel and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: By showing that LIG Laurentide persistence would lead to an RSL oscillation that accords with field evidence, we highlight the need for LIG climate simulations to consider Laurentide ice-sheet dynamics and for more constraints on the LIG history of the Laurentide Ice Sheet.
Book Synopsis Greenland Icefields and Life in the North Atlantic by : George Frederick Wright
Download or read book Greenland Icefields and Life in the North Atlantic written by George Frederick Wright and published by Legare Street Press. This book was released on 2023-07-18 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the Greenland icefields and the North Atlantic region, including an analysis of the causes of the ice age. It provides a comprehensive view of the natural history of the area, with a focus on geology, climate, and life forms. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Book Synopsis The Greenland Ice Sheet by : Statens Naturhistoriske Museum
Download or read book The Greenland Ice Sheet written by Statens Naturhistoriske Museum and published by . This book was released on 2014 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ijs en Klimaat by : Roderik van de Wal
Download or read book Ijs en Klimaat written by Roderik van de Wal and published by . This book was released on 1992 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Evolution of the Greenland Ice Sheet from the Last Glacial Maximum to Present-day: An Assessment Using Glaciological and Glacial Isostatic Adjustment Modelling by :
Download or read book The Evolution of the Greenland Ice Sheet from the Last Glacial Maximum to Present-day: An Assessment Using Glaciological and Glacial Isostatic Adjustment Modelling written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we constrain a three-dimensional thermomechanical model of Greenland ice sheet (GrIS) evolution from the Last Glacial Maximum (LGM, 21 ka BP) to the present-day using, primarily, observations of relative sea level (RSL) as well as field data on past ice extent. The new model (Huy2) fits a majority of the observations and is characterised by a number of key features: (i) the ice sheet had an excess volume (relative to present) of 4.1 m ice-equivalent sea level at the LGM, which increased to reach a maximum value of 4.6 m at 16.5 ka BP; (ii) retreat from the continental shelf was not continuous around the entire margin, as there was a Younger Dryas readvance in some areas. The final episode of marine retreat was rapid and relatively late (c. 12 ka BP), leaving the ice sheet land based by 10 ka BP; (iii) in response to the Holocene Thermal Maximum (HTM) the ice margin retreated behind its present-day position by up to 80 km in the southwest, 20 km in the south and 80 km in a small area of the northeast. As a result of this retreat the modelled ice sheet reaches a minimum extent between 5 and 4 ka BP, which corresponds to a deficit volume (relative to present) of 0.17 m ice-equivalent sea level. The results suggest that remaining discrepancies between the model and the observations are likely associated with non-Greenland ice load, differences between modelled and observed present-day ice elevation around the margin, lateral variations in Earth structure and/or the pattern of ice margin retreat. Predictions of present-day vertical land motion generated using the new Huy2 model are highly sensitive to variations of upper mantle viscosity. Depending on the Earth model adopted, different periods of post-LGM ice loading change dominate the present-day response in particular regions of Greenland. These results will be a useful resource when interpreting existing and future observations of vertical land motion in Greenland. In comparison to the sparse number of.
Book Synopsis Glacial History of Northeast Greenland by : Lena Håkansson
Download or read book Glacial History of Northeast Greenland written by Lena Håkansson and published by . This book was released on 2008 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Constraining the Southern Part of the Greenland Ice Sheet Since the Last Glacial Maximum from Relative Sea-level Changes, Cosmogenic Dates and Glacial-isostatic Adjustment Models by : Charlotte Jönsson Sparrenbom
Download or read book Constraining the Southern Part of the Greenland Ice Sheet Since the Last Glacial Maximum from Relative Sea-level Changes, Cosmogenic Dates and Glacial-isostatic Adjustment Models written by Charlotte Jönsson Sparrenbom and published by . This book was released on 2006 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stratigraphic Studies in the Snow and Firn of the Greenland Ice Sheet by : Carl S. Benson
Download or read book Stratigraphic Studies in the Snow and Firn of the Greenland Ice Sheet written by Carl S. Benson and published by . This book was released on 1960 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
