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Deglaciation And Latest Pleistocene And Early Holocene Glacier Readvances On The Alaska Peninsula Records Of Rapid Climate Change Due To Transient Changes In Solar Intensity And Atmospheric Co2 Content
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Book Synopsis Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? by : De Anne S. Pinney Stevens
Download or read book Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? written by De Anne S. Pinney Stevens and published by . This book was released on 1992 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geologic mapping near Windy Creek, Katmai National Park, identified two sets of glacial deposits postdating late-Wisconsin Iliuk moraines and separated from them by volcaniclastic deposits laid down under ice-free conditions. Radiocarbon dating of organic material incorporated in the younger Katolinat till and in adjacent peat and lake sediments suggests that alpine glaciers on the northern Alaska Peninsula briefly expanded between ca. 8500 and 10,000 years B.P. Stratigraphic relationships and radiocarbon dates suggest an age for the older Ukak drift near the Pleistocene-Holocene boundary between ca. 10,000 and 12,000 years B.P. We suggest that rapid deglaciation following deposition of the Iliuk drift occurred ca. 13,000-12,000 years B.P. in response to large increases in global atmospheric greenhouse gas content, including C02. Short-term decreases in these concentrations, as recorded in polar ice cores, may be linked with brief periods of glacier expansion during the latest Pleistocene and early Holocene. A transient episode of low solar intensity may also have occurred during parts of the early Holocene. Rapid environmental changes and glacial fluctuations on the Alaska Peninsula may have been in response to transient changes in the concentration of atmospheric greenhouse gases and solar intensity.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Glaciological Data by : World Data Center A for Glaciology
Download or read book Glaciological Data written by World Data Center A for Glaciology and published by . This book was released on 1977 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Permafrost Bibliography Update, 1988-1992 by :
Download or read book Permafrost Bibliography Update, 1988-1992 written by and published by . This book was released on 1993 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Gunter Weller Publisher :Geophysical Institute University of Alaska Fairbanks ISBN 13 : Total Pages :388 pages Book Rating :4.3/5 (91 download)
Book Synopsis International Conference on the Role of the Polar Regions in Global Change by : Gunter Weller
Download or read book International Conference on the Role of the Polar Regions in Global Change written by Gunter Weller and published by Geophysical Institute University of Alaska Fairbanks. This book was released on 1991 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this conference was to define and summarize the state of knowledge on the role of the Arctic and Antarctic regions in global change and to identify gaps in knowledge. Topics covered include: detection and monitoring of change : climate variability and climate forcing : ocean/sea ice/atmosphere interactions and processes : effects on biota and biological feedbacks : ice sheet, glacier and permafrost responses and feedbacks : paleoenvironmental studies : aerosols/trace gases.
Download or read book Report of Investigations written by and published by . This book was released on 1995 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1992 with total page 1736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quaternary Stratigraphy and Geomorphology of the Cold Bay Region of the Alaska Peninsula by : Tina M. Dochat
Download or read book Quaternary Stratigraphy and Geomorphology of the Cold Bay Region of the Alaska Peninsula written by Tina M. Dochat and published by . This book was released on 1997 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1992 with total page 1400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography and Index of Geology by :
Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1992 with total page 1592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography on Cold Regions Science and Technology by :
Download or read book Bibliography on Cold Regions Science and Technology written by and published by . This book was released on 1992 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reconstructing Late Pleistocene Deglaciation and Holocene Glacial Advance Using Lacustrine Sediments and 10Be Exposure Dating, Brooks Range, Arctic Alaska℗ by : Michael E. Badding
Download or read book Reconstructing Late Pleistocene Deglaciation and Holocene Glacial Advance Using Lacustrine Sediments and 10Be Exposure Dating, Brooks Range, Arctic Alaska℗ written by Michael E. Badding and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arctic is among the most sensitive locations to climate change, where feedback mechanisms involving the cryosphere result in climate amplification. Because of their sensitivity to summer temperature and winter precipitation, glaciers can be used as proxies for climate change and reconstructions of past glacier fluctuations provide details about paleoclimate. Here, a chronology of late Pleistocene deglaciation and Neoglacial growth is constructed for two valleys in the north-central Brooks Range, Arctic Alaska. Cosmogenic 10Be exposure dating was used on ice-sculpted valley-bottom bedrock outcrops and boulders from Holocene moraine crests. Both valleys show evidence of retreat from the range front ~16-15 ka, and retreat into individual cirques by ~14 ka. There is no evidence for a standstill or re-advance during Late Glacial (14-11 ka) time. Neoglaciation was underway during the middle Holocene, constrained by a moraine dated to 4. 6±0. 5 ka.^Using this moraine age, and another moraine dated at 2. 7±0. 2 ka, this project confirms the accuracy of the previously established lichen growth curve to estimate moraine ages. This project also confirms that glaciers during early Neoglaciation had equal or larger extents than during the Little Ice Age (1200-1900 AD). Sediments collected from a proglacial lake downvalley of modern cirque glaciers reveal episodic sediment deposition from which it is difficult to isolate a signal of glacier advance. Comparing the lake sediment data to the moraine chronology suggests that Upper Kurupa Lake, based on the measured proxies, does not record glacial advances. Several conditions within the lake's catchment likely obscures any glacial signal. Further, more detailed measurements on the lake sediment might reveal additional clues on glacier activity.^Despite the apparent lack of recording changes in glacial length, sediment characteristics suggest a period of stable deposition since 1300 AD, possibly attributed to cooling during the Little Ice Age.
Download or read book The Great Ice Age written by J.A. Chapman and published by Routledge. This book was released on 2005-06-21 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Documents and explains the natural climatic and ecological changes that have occurred during the past 2.6 million years. It also outlines the emergence and global impact of humans during this period.
Book Synopsis Reconstructing Late Pleistocene and Holocene Glacier Fluctuations Using Cosmogenic 10Be Exposure Dating and Lacustrine Sediment, Brooks Range, Arctic Alaska by : Elizabeth Grayce Ceperley
Download or read book Reconstructing Late Pleistocene and Holocene Glacier Fluctuations Using Cosmogenic 10Be Exposure Dating and Lacustrine Sediment, Brooks Range, Arctic Alaska written by Elizabeth Grayce Ceperley and published by . This book was released on 2014 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to cryosphere-albedo feedbacks mechanisms, climate change is amplified in the Arctic, making it sensitive to changes in temperature. Alpine glaciers grow and retreat depending on climate, and are excellent recorders of past climate fluctuations. By analyzing the landforms and sediment deposited by glaciers, high-resolution climate chronologies can be constructed and past glacier fluctuations can be inferred. 10Be ages and physical properties of lake sediment are used here to reconstruct Late Pleistocene and Holocene glacier activity from Alapah River valley and Shainin Lake in the north-central Brooks Range. 10Be ages from moraine boulders in Alapah River valley in the north-central Brooks Range were used to reconstruct the maximum glacier extent during the LGM. After eliminating outliers, the 10Be ages from a terminal moraine deposit in the Alapah River valley indicate that the local LGM culminated at 21. 0 ℗ł 0. 8 ka. This new 10Be chronology is the first to firmly constrain the timing of the local LGM in the Brooks Range, and is in agreement with LGM moraine records from other sites in Alaska and the globe. Two 10Be ages from boulders located on bedrock 14 km upvalley from the Itkillik II terminal moraine give an age of deglaciation in Alapah River valley of 18. 2 ℗ł 0. 8 ka. This indicates rapid retreat after the LGM and shows that deglaciation is synchronous with sites in Alaska but was initiated earlier than the age of 17 ka previously proposed for onset of LGM deglaciation in the western US. Physical and geochemical properties of lake sediment from a proglacial lake in Alapah River valley, Shainin Lake, were analyzed to investigate any glacial signals recorded in the lake sediment. Age-depth models for each core were established using 14C ages and analytical methods included magnetic susceptibility, wet bulk density (WBD), scanning X-Ray fluorescence (ITRAX) and visible scanning reflectance spectroscopy. The WBD record from Shainin Lake may serve as a proxy for glacial history of Alapah and Kayak Creek valleys. If interpreted correctly, glacial activity increased from 12,700 to ~10,000 cal yr, decreased from ~10,000 to ~5700 cal yr BP, then increased from ~5700 cal yr BP to the present. This indicates that there is evidence for early Holocene glacial activity, the retreating or stagnating glaciers in the middle Holocene until ~5700 cal yr BP, followed by expanding ice.
Book Synopsis Polar Environments and Global Change by : Roger G. Barry
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 After the Ice Age written by E.C. Pielou and published by University of Chicago Press. This book was released on 2008-04-15 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fascinating story of how a harsh terrain that resembled modern Antarctica has been transformed gradually into the forests, grasslands, and wetlands we know today.
Download or read book Deglaciation written by Marcella Boone and published by Nova Science Publishers. This book was released on 2017 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Global climate during the Quaternary has been deeply influenced by glacial-interglacial oscillations. Since the onset of glaciations, the Earth has experienced alternations between warm and stable climatic periods - coinciding with interglacials, and cold and highly variable climatic intervals - coinciding with glacials. In a suborbital timescale, climate oscillations were maximal during glacial onsets and, very especially, during deglaciations. Previous deglaciation events were associated with diverse changes in earth's atmospheric, physical and biotic environments. Chapter One contains a brief outline of a case study conducted in western Canada to constrain the Late Pleistocene retreat of the Laurentide Ice Sheet from the region. Chapter Two reports on the influence of deglaciations in the mid-latitude European climate. Chapter Three aims to highlight the influence of global and regional paleoceanographic changes on the deglaciation of the marine based Barents ice sheet since the last glacial maximum (LGM) until the onset of marine environment in the Holocene.
