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Author : Nancy Horner Bigelow
Publisher :
ISBN 13 :
Total Pages : 424 pages
Book Rating : 4.:/5 (42 download)
Download or read book Late Quaternary Vegetation and Lake Level Changes in Central Alaska written by Nancy Horner Bigelow and published by . This book was released on 1997 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Valerie Ann Barber
Publisher :
ISBN 13 :
Total Pages : 262 pages
Book Rating : 4.:/5 (51 download)
Download or read book Millennial to Annual Scale Paleoclimatic Change in Central Alaska During the Late Quaternary Interpreted from Lake Sediments and Tree Rings written by Valerie Ann Barber and published by . This book was released on 2002 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The theme of this dissertation is the importance of effective moisture (precipitation minus evaporation) in subarctic ecosystems. Interior Alaska has a relatively dry climate with annual precipitation ranging from 25-45 cm. Records from interior Alaska lake sediment cores show low lake levels following the Last Glacial Maximum, with significant increases at 12,000 and 9,000 14C years B.P. Using lake-level reconstructions and models based on modern hydrologic and meteorologic data, we infer precipitation of 35-75% less than modern at 12,000 yr. BP, 25-45% less than modern at 9,000 yr. BP, and 10-20% less than modern at 6,000 yr. BP. Trees were scarce on the interior Alaskan landscape during the late Pleistocene with birch species appearing about 12,000 BP and spruce species approximately 3500 years later. The correspondence between lake-level and vegetation changes suggests that moisture may have been one of the limiting factors in the establishment of these tree species. Alaska climate records show a climatic regime shift in the mid-1970s. Less effective moisture is available over the past 30 years because summer temperatures in interior Alaska have been increasing without a concurrent increase in precipitation. Radial growth of white spruce at 20 low elevation stands in interior Alaska declined corresponding with this climatic change. The observation that moisture limits spruce growth in Alaska today is consistent with our inference of moisture limitation in the early Holocene. A 200-year reconstruction was developed based on two tree ring proxies, 13C discrimination and maximum latewood density, which together show excellent agreement with the recorded Fairbanks average May through August temperatures. The first half of the 20th century is characterized by the coolest summers of the 200 year period of reconstruction, while the latter part of the 20th century, particularly from 1974 onward, is characterized by some of the warmest summers of the 200 year period. Mid-19th century summer temperatures reconstruct to be as warm as the latter part of the 20th century, which is inconsistent with reconstructions of other regions. It seems likely, based on current information, that these inconsistencies may be real and may reflect regional synoptic conditions unique to interior Alaska. Distinctive decadal scale regimes were identified throughout the record"--Leaf iii.
Author : F. Stuart Chapin
Publisher : Oxford University Press
ISBN 13 : 0195154312
Total Pages : 369 pages
Book Rating : 4.1/5 (951 download)
Download or read book Alaska's Changing Boreal Forest written by F. Stuart Chapin and published by Oxford University Press. This book was released on 2006-01-12 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Boreal forest is the northern-most forest in the world, whose organisms and dynamics are shaped by low temperature and high latitude. The Alaskan Boreal forest is warming as rapidly as any place on earth, providing an opportunity to examine a biome as it adjusts to change. This book looks at this issue.
Author : Linda B. Brubaker
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (181 download)
Download or read book Late Quaternary Vegetation and Climate History of Southwestern Alaska written by Linda B. Brubaker and published by . This book was released on 1991 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes objectives and partially reviews existing literature for a proposed research project. Objectives of that project include analyzing pollen content of sediment cores from Southwestern Alaska lakes, interpreting the late Quaternary vegetation and climate history of this region based on new and previously existing data, and comparing these histories to those from other regions of Beringia.
Author : Shannon Marie Brady
Publisher :
ISBN 13 :
Total Pages : 314 pages
Book Rating : 4.:/5 (89 download)
Download or read book A Multi-proxy Approach to Late Quaternary Environmental Change at Little Harding Lake, Interior Alaska written by Shannon Marie Brady and published by . This book was released on 2013 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-proxy records from lakes are especially important for identifying modern sediment distributional and compositional trends as well as deciphering paleoenvironmental changes in interior Alaska. This study aims to understand modern interior Alaskan lake processes, interpret a 1 5,000 cal yr record of lake-level change from Little Harding Lake, and relate these findings to evolution of the boreal forest with the underlying assumption that the expansion of these ecosystems is largely influenced by moisture availability. Limnologic and surface sediment transect data identify distributional and compositional trends in sediment with water depth that are largely controlled by sediment source, physical processes, aquatic macrophytes, and lake stratification. Sedimentologic, elemental, and isotopic records of lake-level change reveal a l 5,000 cal yr BP water balance history that correlates with boreal forest establishment in interior Alaska. This study provides an understanding of how interior Alaskan lakes and watershed responded to changing climate throughout the late Quaternary.
Author : Thomas Alan Ager
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.3/5 (243 download)
Download or read book Late Quaternary Environmental History of the Tanana Valley, Alaska written by Thomas Alan Ager and published by . This book was released on 1975 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A.R. Gillespie
Publisher : Elsevier
ISBN 13 : 0080474098
Total Pages : 595 pages
Book Rating : 4.0/5 (84 download)
Download or read book The Quaternary Period in the United States written by A.R. Gillespie and published by Elsevier. This book was released on 2003-12-17 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews advances in understanding of the past ca. two million years of Earth history - the Quaternary Period - in the United States. It begins with sections on ice and water - as glaciers, permafrost, oceans, rivers, lakes, and aquifers. Six chapters are devoted to the high-latitude Pleistocene ice sheets, to mountain glaciations of the western United States, and to permafrost studies. Other chapters discuss ice-age lakes, caves, sea-level fluctuations, and riverine landscapes. With a chapter on landscape evolution models, the book turns to essays on geologic processes. Two chapters discuss soils and their responses to climate, and wind-blown sediments. Two more describe volcanoes and earthquakes, and the use of Quaternary geology to understand the hazards they pose. The next part of the book is on plants and animals. Five chapters consider the Quaternary history of vegetation in the United States. Other chapters treat forcing functions and vegetation response at different spatial and temporal scales, the role of fire as a catalyst of vegetation change during rapid climate shifts, and the use of tree rings in inferring age and past hydroclimatic conditions. Three chapters address vertebrate paleontology and the extinctions of large mammals at the end of the last glaciation, beetle assemblages and the inferences they permit about past conditions, and the peopling of North America. A final chapter addresses the numerical modeling of Quaternary climates, and the role paleoclimatic studies and climatic modeling has in predicting future response of the Earth's climate system to the changes we have wrought.
Author : Eric Gustaf Edlund
Publisher :
ISBN 13 :
Total Pages : 278 pages
Book Rating : 4.:/5 (33 download)
Download or read book Reconstruction of Late Quaternary Vegetation and Climate at Lake Moran, Central Sierra Nevada, California written by Eric Gustaf Edlund and published by . This book was released on 1991 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cary Mock
Publisher : Newnes
ISBN 13 : 0444536426
Total Pages : 3883 pages
Book Rating : 4.4/5 (445 download)
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
Author : Troy Lewis Péwé
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.3/5 (121 download)
Download or read book Quaternary Geology of Alaska written by Troy Lewis Péwé and published by . This book was released on 1975 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the glacial, periglacial, eolian, fluvial, lacustrine, marine, and volcanic deposits of Quaternary age in Alaska and Paleoclimatic fluctuations in light of formation and disappearance of glaciers and permafrost and changes in the distribution of plants and animals.
Author : Yarrow L. Axford
Publisher :
ISBN 13 :
Total Pages : 362 pages
Book Rating : 4.:/5 (466 download)
Download or read book Late Quaternary Glacier Fluctuations and Vegetation Change in the Northwestern Ahklun Mountains, Southwestern Alaska written by Yarrow L. Axford and published by . This book was released on 2000 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Herbert Edgar Wright
Publisher : U of Minnesota Press
ISBN 13 : 145290796X
Total Pages : 298 pages
Book Rating : 4.4/5 (529 download)
Download or read book Late Quaternary Environments of the United States written by Herbert Edgar Wright and published by U of Minnesota Press. This book was released on 1983 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Antoinette Mannion
Publisher : Routledge
ISBN 13 : 1317889401
Total Pages : 400 pages
Book Rating : 4.3/5 (178 download)
Download or read book Global Environmental Change written by Antoinette Mannion and published by Routledge. This book was released on 2014-09-19 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in its second edition. This text has been extensively revised and rewritten to reflect the growth in environmental research during the last decade. Human-induced environmental change is occurring at such a rapid rate that, inevitably, the fundamental processes involved in biogeochemical cycling are being altered. Global Environmental Change considers alterations to the biogeochemical cycles of carbon, nitrogen, sulphur and other elements as a result of industrial/technological development and agriculture, which have significantly altered the natural environment. The book adopts a temporal and spatial approach to environmental change, beginning with the natural environmental change of the Quaternery period and continuing with the culturally-induced change since the inception of agriculture 10,000 years ago.
Author : Karen B. Stilwell
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)
Download or read book Late Quaternary Glacial Geology, Shoreline Morphology, and Tephrochronology of the Lliamna/Naknek/Brooks Lake Area, Southwestern Alaska written by Karen B. Stilwell and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study focuses on the late-Wisconsin Brooks Lake glaciation, lake-level fluctuations, and volcanic deposits in the lliarnna/Naknek/Brooks Lake area on the northern Alaska Peninsula, southwestern Alaska. The Brooks Lake glaciation consists of five stades, from youngest to oldest: Kvichak, Uiarnna, Newhalen, Iliuk, and Ukak. This thesis reassigns the type Mak Hill moraine to a pre-late-Wisconsin glaciation, and considers the moraine enclosing Naknek Lake an early-late-Wisconsin deposit correlative to either the Kvichak stade, lliarnna stade, or both. The presence in the Iliamna Lake valley, and the absence in the Naknek Lake valley of a two-fold earliest-late-Wisconsin Kvichak/Iliamna glacial sequence suggest that the two glacial systems responded differently to climate change, or glacier/bed dynamics due to differing ice sources and glacier configurations. Plant macrofossils dated at 26,155 ℗ł 285 I4C yr BP afford a new maximum-limiting age on the type Kvichak moraine. Slope angles on the type Kvichak and Iliamna moraines are less steep (~11-15℗ʻ) than on younger Newhalen, lliuk, and Ukak moraines (~18-20℗ʻ ), indicating that a considerable length of time separated the Iliamna and Newhalen stades. Correlation of this time-stratigraphic marker with other better dated Alaskan glacial sequences suggests that the interstadial occurred -13-14 ka. Following late-Wisconsin de glaciation of the Iliamna and Naknek lake basins, lake levels lowered, creating a flight of wave-cut terraces. Horizontal terraces, formed during latest-Wisconsin/early-Holocene time, at ~40 m above Iliamna Lake, and ~15 and ~30 m above Naknek Lake, suggest that these shorelines are not tilted as a result of glacial isostatic rebound or regional tectonism. The most prominent terraces above both lakes lay about halfway between the highest terrace and present-day lake level. If these terraces are correlative, then this indicates some climate control on lake-level fluctuations. Electron-microprobe analysis of six late-Pleistocene tephra samples allows five samples to be correlated with latest-Pleistocene Lethe tephra, and extends the Lethe ash plume ~125 km westward, and ~150 km northwestward of its presumed source area. Analysis of four early-Holocene black tephras fails to support any correlations, suggesting that there are multiple black tephras in the area. Ash C, a tricolored ash, consists of more than one chemically distinct tephra, and there is little consistency between color zones of the ash at different sites.
Author : Jonathan Child
Publisher :
ISBN 13 :
Total Pages : 410 pages
Book Rating : 4.:/5 (325 download)
Download or read book A Late Quaternary Lacustrine Record of Environmental Change in the Wonder Lake Area, Denali National Park and Preserve, Alaska written by Jonathan Child and published by . This book was released on 1995 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ian Gregory
Publisher : Routledge
ISBN 13 : 1351584146
Total Pages : 636 pages
Book Rating : 4.3/5 (515 download)
Download or read book The Routledge Companion to Spatial History written by Ian Gregory and published by Routledge. This book was released on 2018-01-19 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Routledge Companion to Spatial History explores the full range of ways in which GIS can be used to study the past, considering key questions such as what types of new knowledge can be developed solely as a consequence of using GIS and how effective GIS can be for different types of research. Global in scope and covering a broad range of subjects, the chapters in this volume discuss ways of turning sources into a GIS database, methods of analysing these databases, methods of visualising the results of the analyses, and approaches to interpreting analyses and visualisations. Chapter authors draw from a diverse collection of case studies from around the world, covering topics from state power in imperial China to the urban property market in nineteenth-century Rio de Janeiro, health and society in twentieth-century Britain and the demographic impact of the Second Battle of Ypres in 1915. Critically evaluating both the strengths and limitations of GIS and illustrated with over two hundred maps and figures, this volume is an essential resource for all students and scholars interested in the use of GIS and spatial analysis as a method of historical research.
Author : Reinhard Pienitz
Publisher : Springer Science & Business Media
ISBN 13 : 1402021267
Total Pages : 579 pages
Book Rating : 4.4/5 (2 download)
Download or read book Long-term Environmental Change in Arctic and Antarctic Lakes written by Reinhard Pienitz and published by Springer Science & Business Media. This book was released on 2007-11-08 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concerns about the effects of global climate change have focused attention on the vulnerability of circumpolar regions. This book offers a synthesis of the spectrum of techniques available for generating long-term environmental records from circumpolar lakes.
