Download or read book The Deep sea Record of Rapid Late Pleistocene Paleoclimate Change and Ice sheet Dynamics in Labrador Sea Sediments written by Harunur Rashid and published by . This book was released on 2002 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The presence of H3 between 46° and ~63°N in the Labrador Sea, previously debated, has been proved. Thickness variations for H3 were compiled on an isopach map showing a maximum thickness of 4.8 m near Hudson Strait and thinning to 30 cm in the central Labrador Sea." --
Download or read book Abrupt Climate Change written by Harunur Rashid and published by John Wiley & Sons. This book was released on 2013-05-02 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 193. Abrupt Climate Change: Mechanisms, Patterns, and Impacts brings together a diverse group of paleoproxy records such as ice cores, marine sediments, terrestrial (lakes and speleothems) archives, and coupled ocean-atmosphere climate models to document recent advances in understanding the mechanisms of abrupt climate changes. Since the discovery of the Dansgaard-Oeschger events in Greenland ice cores and the subsequent discovery of their contemporary events in the marine sediments of the North Atlantic, the search for these abrupt, millennial-scale events across the globe has intensified, and as a result, the number of paleoclimatic records chronicling such events has increased. The volume highlights include discussions of records of past climate variability, meridional overturning circulation, land-ocean-atmosphere interactions, feedbacks in the climate system, and global temperature anomalies. Abrupt Climate Change will be of interest to students, researchers, academics, and policy makers who are concerned about abrupt climate change and its potential impact on society.
Download or read book Polar Environments and Global Change written by Roger G. Barry and published by Cambridge University Press. This book was released on 2018-08-09 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveys atmospheric, oceanic and cryospheric processes, present and past conditions, and changes in polar environments.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2007 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Pleistocene Climatic Record in Norwegian and Greenland Sea Deep sea Cores written by Thomas Bartlett Kellogg and published by . This book was released on 1973 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arctic Ocean Sediments Processes Proxies and Paleoenvironment written by R. Stein and published by Elsevier. This book was released on 2008-07-22 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although it is generally accepted that the Arctic Ocean is a very sensitive and important region for changes in the global climate, this region is the last major physiographic province of the earth whose short-and long-term geological history is much less known in comparison to other ocean regions. This lack of knowledge is mainly caused by the major technological/logistic problems in reaching this harsh, ice-covered region with normal research vessels and in retrieving long and undisturbed sediment cores. During the the last about 20 years, however, several international and multidisciplinary ship expeditions, including the first scientific drilling on Lomonosov Ridge in 2004, a break-through in Arctic research, were carried out into the central Artic and its surrounding shelf seas. Results from these expeditions have greatly advanced our knowledge on Arctic Ocean paleoenvironments. Published syntheses about the knowledge on Arctic Ocean geology, on the other hand, are based on data available prior to 1990. A comprehensive compilation of data on Arctic Ocean paleoenvironment and its short-and long-term variability based on the huge amount of new data including the ACEX drilling data, has not been available yet. With this book, presenting (1) detailed information on glacio-marine sedimentary processes and geological proxies used for paleoenvironmental reconstructions, and (2) detailed geological data on modern environments, Quaternary variability on different time scales as well as the long-term climate history during Mesozoic-Tertiary times, this gap in knowledge will be filled.*Aimed at specialists and graduates *Presents background research, recent developments, and future trends*Written by a leading scholar and industry expert
Download or read book Encyclopedia of Quaternary Science written by Cary Mock and published by Newnes. This book was released on 2013-03-25 with total page 3883 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second revised edition of the Encyclopedia of Quaternary Science, Four Volume Set, provides both students and professionals with an up-to-date reference work on this important and highly varied area of research. There are lots of new articles, and many of the articles that appeared in the first edition have been updated to reflect advances in knowledge since 2006, when the original articles were written. The second edition will contain about 375 articles, written by leading experts around the world. This major reference work is richly illustrated with more than 3,000 illustrations, most of them in colour. Research in the Quaternary sciences has advanced greatly in the last 10 years, especially since topics like global climate change, geologic hazards and soil erosion were put high on the political agenda. This second edition builds upon its award-winning predecessor to provide the reader assured quality along with essential updated coverage Contains 357 broad-ranging articles (4310 pages) written at a level that allows undergraduate students to understand the material, while providing active researchers with a ready reference resource for information in the field. Facilitates teaching and learning The first edition was regarded by many as the most significant single overview of Quaternary science ever, yet Editor-in-Chief, Scott Elias, has managed to surpass that in this second edition by securing even more expert reviews whilst retaining his renowned editorial consistency that enables readers to navigates seamlessly from one unfamiliar topic to the next
Download or read book Abrupt Impacts of Climate Change written by National Research Council and published by National Academies Press. This book was released on 2013-12-31 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate is changing, forced out of the range of the past million years by levels of carbon dioxide and other greenhouse gases not seen in the Earth's atmosphere for a very, very long time. Lacking action by the world's nations, it is clear that the planet will be warmer, sea level will rise, and patterns of rainfall will change. But the future is also partly uncertain-there is considerable uncertainty about how we will arrive at that different climate. Will the changes be gradual, allowing natural systems and societal infrastructure to adjust in a timely fashion? Or will some of the changes be more abrupt, crossing some threshold or "tipping point" to change so fast that the time between when a problem is recognized and when action is required shrinks to the point where orderly adaptation is not possible? Abrupt Impacts of Climate Change is an updated look at the issue of abrupt climate change and its potential impacts. This study differs from previous treatments of abrupt changes by focusing on abrupt climate changes and also abrupt climate impacts that have the potential to severely affect the physical climate system, natural systems, or human systems, often affecting multiple interconnected areas of concern. The primary timescale of concern is years to decades. A key characteristic of these changes is that they can come faster than expected, planned, or budgeted for, forcing more reactive, rather than proactive, modes of behavior. Abrupt Impacts of Climate Change summarizes the state of our knowledge about potential abrupt changes and abrupt climate impacts and categorizes changes that are already occurring, have a high probability of occurrence, or are unlikely to occur. Because of the substantial risks to society and nature posed by abrupt changes, this report recommends the development of an Abrupt Change Early Warning System that would allow for the prediction and possible mitigation of such changes before their societal impacts are severe. Identifying key vulnerabilities can help guide efforts to increase resiliency and avoid large damages from abrupt change in the climate system, or in abrupt impacts of gradual changes in the climate system, and facilitate more informed decisions on the proper balance between mitigation and adaptation. Although there is still much to learn about abrupt climate change and abrupt climate impacts, to willfully ignore the threat of abrupt change could lead to more costs, loss of life, suffering, and environmental degradation. Abrupt Impacts of Climate Change makes the case that the time is here to be serious about the threat of tipping points so as to better anticipate and prepare ourselves for the inevitable surprises.
Download or read book Late Pleistocene and Postglacial Sedimentation and Stratigraphy of Deep sea Environments Off Oregon written by John Russell Duncan and published by . This book was released on 1968 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pleistocene Laurentide Ice Sheet Drainage Into the Labrador Sea Sedimentary Facies Depositional Mechanisms Stratigraphy and Significance of Heinrich Events written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chronology Paleoecology and Stratigraphy of Late Pleistocene Sediments from the Hudson Bay Lowlands Canada written by April Sue Dalton and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Stratigraphic records in the Hudson Bay Lowlands (HBL), Canada, offer rare insight into local paleoenvironments and the Late Pleistocene climate system over North America. Age determinations on sub-till non-glacial materials suggest that the HBL, lying near the centre of the Last Glacial Maximum (LGM) extent of the Laurentide Ice Sheet (LIS), was ice-free for parts of Marine Isotope Stage 3 (MIS 3; 57,000 to 29,000 yr BP), MIS 5 (130,000 to 71,000 yr BP) and MIS 7 (243,000 to 190,000 yr BP). The MIS 3 age assignment is notable since it suggests the possibility of significant retreat of the LIS and a relatively high global sea level, both of which are a contrast to assumptions that North America was moderately glaciated, and that global sea level was relatively low during that time interval. Paleoecological proxies, including pollen and plant macrofossils, suggest that the HBL contained peatland and boreal vegetation during all previous non-glacial intervals, and pollen-based quantitative reconstructions of sites which are hypothesized to be MIS 3 and MIS 5a (~80,000 yr BP) in age suggest that climate during MIS 3 may have had less annual precipitation than during MIS 5a and present day. Stratigraphic analyses of these glacial and non-glacial sediments provide insight into the dynamicity of Late Pleistocene ice sheets; multiproxy analyses of three stratigraphic successions along the Albany River resulted in the recognition of at least three glacial advances from shifting ice centers within the QuĂŠbec sector of the Laurentide Ice Sheet during the Late Pleistocene. This dissertation contributes a chronological dataset for reconstructing the movement, timing and dynamics of Late Pleistocene ice sheets over North America, as well as paleoecological data for understanding the character and distribution of boreal peatlands during previous interstadial and interglacial periods.
Download or read book Last Glacial deglacial Variability in Sea Surface Characteristics and Ice Sheet Activities in the Labrador Sea Baffin Bay written by Defang You and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of global warming, the accelerated melting of the Greenland Ice Sheet (GrIS) and Arctic sea ice in recent years has led to increased meltwater discharge and subsequent sea-level rise. The meltwater discharge may affect sea surface characteristics in the polar and subpolar regions and potentially yield significant influence on ocean circulation patterns. Additionally, the far-reaching implications of ocean forcings on ice sheet instability and sea ice retreat have also raised considerable attention. To enhance our understanding of the influences of meltwater discharge on abrupt climatic changes and interactions among ice sheet instability, sea ice variability, and sea surface characteristics, it is essential to investigate sedimentary records on different timescales beyond modern observation. To achieve these objectives, we conducted detailed paleoenvironmental reconstructions from three sediment cores: one obtained from the eastern Labrador Sea (Core MSM12/2-05-01) and two others from southern Baffin Bay (Core SL170 and SL174). This study provides new insights into variations in sea surface characteristics and their interactions with ice sheet activities in the Labrador Sea and Baffin Bay during the last glacial-deglacial-Holocene period. Meanwhile, our findings provide more information about the impact of freshwater forcing/ice sheet activities on abrupt climate changes. Furthermore, these findings highlight the significance of oceanic processes within the polar and subpolar regions and their contributions to paleoclimate changes.
Download or read book Glaciated Margins written by D.P. Le Heron and published by Geological Society of London. This book was released on 2019-04-08 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the sedimentary and geophysical archive of glaciated margins is a complex task that requires integration and analysis of disparate sedimentological and geophysical data. Their analysis is vital for understanding the dynamics of past ice sheets and how they interact with their neighbouring marine basins, on timescales that cannot be captured by observations of the cryosphere today. As resources, sediments deposited on the inner margins of glaciated shelves also exhibit resource potential where more sand-dominated systems occur, acting as reservoirs for both hydrocarbons and water. This book surveys the full gamut of glaciated margins, from deep time (Neoproterozoic, Ordovician and Carboniferous–Permian) to modern high-latitude margins in Canada and Antarctica. This collection of papers is the first attempt to deliberately do this, allowing not only the similarities and differences between modern and ancient glaciated margins to be explored, but also the wide spectrum of their mechanisms of investigation to be probed. Together, these papers offer a high-resolution, spatially and temporally diverse blueprint of the depositional processes, ice sheet dynamics, and basin architectures of the world’s former glaciated margins; a vital resource in advancing understanding of our present and future marine-terminating ice sheet margins.
Download or read book Late Pleistocene Changes in Northern Component Water written by Aurora Cassandra Elmore and published by . This book was released on 2009 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation reconstructs late Pleistocene oceanic circulation variability within the North Atlantic, a critical region of deep-water formation, using proxies that reconstruct surface and deepwater changes. Unlike other studies that examine North Atlantic circulation as a whole, my study focuses on changes in Iceland Scotland Overflow Water (ISOW), one of the largest contributors to Northern Component Water (NCW). Each NCW component reflects the regional climate within its formation region; thus, different climates may produce different deepwater states by changing the relative contribution from each component. Southern Gardar Drift is bathed by ISOW, thus the accumulating sediments are ideal for examining ISOW. A high-resolution record of the Younger Dryas cold event provides an analog for abrupt climate events. The benthic foraminiferal [delta]13C record from core 11JPC (2707m) on Gardar Drift reveals NCW shoaled during the early and late Younger Dryas. These reductions are coincident with increased meltwater from Northern Hemisphere ice sheets, linking surface freshening to NCW production changes on short-timescales. On longer time-scales, benthic foraminiferal [delta]13C records from Gardar Drift show ISOW density was paced by northern high-latitude summer insolation, particularly within the precessional band. Uniform benthic foraminiferal [delta]13C values on Gardar Drift indicate that the mixing zone between NCW and Southern Component Water (SCW) was positioned to the south of Gardar Drift during interglacial periods. Conversely a large north-south gradient in benthic foraminiferal [delta]13C values during glacial periods indicates that ISOW shoaled, allowing SCW to bathe southern Gardar Drift. High-frequency ISOW variability caused by surface freshening during intermediate climate states is superimposed on the orbitally paced variations. A study of the trace metal compositions in Krithe carapaces found in core top samples demonstrates that calcification temperature is the dominant control on magnesium incorporation. Carbonate ion concentration is a secondary control on magnesium to calcium (Mg/Ca) ratios at low temperatures (
Download or read book U S National Report to International Union of Geodesy and Geophysics written by and published by . This book was released on 1995 with total page 1476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlas of Paleoclimates and Paleoenvironments of the Northern Hemisphere written by B. Frenzel and published by Gustav Fischer. This book was released on 1992-05-01 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
