Download or read book High resolution Speleothem Record of Late Quaternary Climate Change from the Upper Midwest USA written by Sushmita Dasgupta and published by . This book was released on 2008 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Caves and Karst of the Upper Midwest USA written by Greg A. Brick and published by Springer Nature. This book was released on 2020-12-01 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the karst and pseudokarst of the Upper Midwest, USA, consisting of the states of Minnesota, Wisconsin, Iowa, and Illinois—the first regional synthesis in 40 years. Starting with an overview of the regional geology of what is largely glaciated fluviokarst and paleokarst developed on Paleozoic carbonates, but including other lithologies such as the St. Peter Sandstone and the Ft. Dodge Gypsum, the caves, springs, sinkholes, and karst hydrogeology of each state are described. Special attention is devoted to the region’s longest caves: Coldwater Cave, Mystery Cave, and the Minnesota Cave Preserve caves. Application of tools such as data loggers and LiDAR, with new conceptual models such as hypogenic speleogenesis, has been transformative here. Special topics include lead and zinc mining in the Driftless Area, vertebrate and invertebrate cave fauna near the Laurentide ice limit, the impact and policies of nutrient and herbicide intensive modern agriculture on karst, and paleoclimate studies. The discovery, exploration, institutional history of caving organizations, and show caves of the Upper Midwest, from the year 1700 onwards, are brought up to date. The top 10 historical paradigms of cave and karst science in the Midwest are reviewed. Perspectives on paleontology, archeology, and Native American rock art are included.
Download or read book Late Quaternary climatic history of the Helderberg Plateau New York USA written by Stein-Erik Lauritzen and published by . This book was released on 1996 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Holocene Climate Variability in the Southwestern United States from High resolution Speleothem Data written by Jessica Belle Toledo Rasmussen and published by . This book was released on 2006 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physical Geography and Geology of the Driftless Area written by Eric C. Carson and published by Geological Society of America. This book was released on 2019-11-04 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southwest U S Paleoclimate Over the Past 30 Ky written by Kevin J. Meyer and published by . This book was released on 2011 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 30 ky growth rate and high-resolution [delta]18O time series from a central Texas (TX) speleothem provides new climate insights when integrated with recently published speleothem records from New Mexico (NM) and Arizona (AZ), and a foraminifera record from the Gulf of Mexico (GOM). This comparison enables a possible regional assessment of factors controlling temporal variations in rainfall amount and moisture sources in the southwestern U.S. The three speleothem locations (TX, NM, AZ) span near 1,200 km. A regional east-to-west decrease in speleothem [delta]18O values of up to 7%0 is observed between TX and AZ. This is the same direction of regional decrease as in modern rainfall. This suggests 1) mixing of moisture from two sources, Pacific moisture (low [delta]18O), and GOM moisture (high [delta]18O), and 2) that these two sources have contributed moisture to the region for most of the last 30 ky. Prior to 15 ka, relatively large magnitude, millennial-scale oscillations (up to ~3%0) occur in the NM [delta]18O record while the TX and AZ records show smaller variations (~1 %0). Starting at about 15 ka, both the AZ and NM records show a rapid increase in delta18O, whereas TX shows a decrease. This dip in the TX [delta]18O record corresponds with a delta18O decrease in the GOM seawater record that has been attributed to melt water influx. TX and NM show peaks in growth rate between about 15 and 13 ka whereas AZ shows a peak between 13 and 11.5 ka. All three speleothem records show significant decreases in growth rate in the Holocene. The speleothem [delta]18O time series appear to reflect changes in rainfall amount and composition. The correspondence of the TX and GOM records indicates GOM moisture composition as the major control on Late Pleistocene to Holocene TX precipitation composition. NM and AZ, by contrast, apparently received varying proportions of Pacific and GOM sources over this time period. Periods of high [delta]18O values in the NM and AZ records, when combined with relative high growth rates, may suggest increased overall water availability and GOM moisture contribution. The growth rate records are consistent with a regional transition to a drier climate from the latest Pleistocene to the Holocene.
Download or read book Century to Millennium scale Late Quaternary Natural Climate Variability in the Midwestern United States written by Peter Josef Jaumann and published by . This book was released on 1995 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reconstructing High resolution Paleoclimate for Portions of the Last 250 000 Years from Cave of the Mounds Speleothems written by Cameron Jean Batchelor and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pleistocene period was a time of Earth's History marked by 100-kyr paced glacial-interglacial cycles and dominated by the influence of polar glaciation that stimulated Earth system feedbacks. Climate archives that grew during the Pleistocene thus provide the opportunity to explore past climate variability during a time of known global forcings and when distinct climate transitions occurred. Other than ice cores - one of the most robust terrestrial climate archives used by the paleoclimate community - speleothem-based paleoclimate reconstructions provide some of the highest-resolution continental climate records. This is due to their ability to be precisely dated, relatively continuous growth potential that is uninterrupted by surficial erosional processes, and because they form within carbonate (karst) rocks which are located in a variety of locations from the low- to high-latitudes, and thus not restricted to one geographic location. For this dissertation, I use a collection of speleothem samples from a southwestern Wisconsin cave, Cave of the Mounds, to reconstruct paleoclimate for portions of the last 250,000 years. This dissertation seeks to (1) resolve high-resolution oxygen isotope (Îþ18O) records representative of mid-continental North America during former glacial and interglacial periods through the use of specialized imaging and mass spectrometry techniques, and (2) provide data that will characterize climate variability and regional climate response to distinct global forcings in a relatively data-sparse region of the world. Except for Chapter 1, which focuses on U-Th dating methods of speleothems, all chapters of this dissertation use specialized imaging (confocal laser fluorescent microscopy, CLFM) and mass spectrometry (secondary ion mass spectrometer, SIMS) techniques to produce high-resolution Îþ18O records during different time periods of the last 250,000 years. Each chapter focuses on a different time period of the last 250,000 years, specifically the Last Glacial Period (70-50 ka, respectively; Chapter 2), the Late Holocene (3-2 ka; Chapter 3), the Last Interglacial Period (122-118 ka, respectively; Chapter 4), and the Penultimate Interglacial Period (230-218 ka, respectively; Chapter 5).
Download or read book A High resolution Speleothem Record of Indian Ocean Climate Over the Last Glacial Termination from Socotra Island Yemen written by Jeremy D. Shakun and published by . This book was released on 2006 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elk Lake Minnesota Evidence for Rapid Climate Change in the North Central United States written by J. Piatt Bradbury and published by Geological Society of America. This book was released on 1993-01-01 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected papers regarding conditions found in Elk Lake, Minnesota being evidence for rapid climate change in the north-central United States. Among the topics: the chronology of Elk Lake sediments, climate and limnological settings, and deposition of calcium carbonate. Annotation copyright Book News
Download or read book Quaternary Dating Methods written by Mike Walker and published by John Wiley & Sons. This book was released on 2013-04-30 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introductory textbook introduces the basics of dating, the range of techniques available and the strengths and limitations of each of the principal methods. Coverage includes: the concept of time in Quaternary Science and related fields the history of dating from lithostratigraphy and biostratigraphy the development and application of radiometric methods different methods in dating: radiometric dating, incremental dating, relative dating and age equivalence Presented in a clear and straightforward manner with the minimum of technical detail, this text is a great introduction for both students and practitioners in the Earth, Environmental and Archaeological Sciences. Praise from the reviews: "This book is a must for any Quaternary scientist." SOUTH AFRICAN GEOGRAPHICAL JOURNAL, September 2006 “...very well organized, clearly and straightforwardly written and provides a good overview on the wide field of Quaternary dating methods...” JOURNAL OF QUATERNARY SCIENCE, January 2007
Download or read book Surface Temperature Reconstructions for the Last 2 000 Years written by National Research Council and published by National Academies Press. This book was released on 2007-01-05 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: In response to a request from Congress, Surface Temperature Reconstructions for the Last 2,000 Years assesses the state of scientific efforts to reconstruct surface temperature records for Earth during approximately the last 2,000 years and the implications of these efforts for our understanding of global climate change. Because widespread, reliable temperature records are available only for the last 150 years, scientists estimate temperatures in the more distant past by analyzing "proxy evidence," which includes tree rings, corals, ocean and lake sediments, cave deposits, ice cores, boreholes, and glaciers. Starting in the late 1990s, scientists began using sophisticated methods to combine proxy evidence from many different locations in an effort to estimate surface temperature changes during the last few hundred to few thousand years. This book is an important resource in helping to understand the intricacies of global climate change.
Download or read book Landscape Response to Late Quaternary Climatic Change on the Southern High Plains USA written by Julie Rich and published by . This book was released on 2003 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluvial Processes and Environmental Change written by A. G. Brown and published by . This book was released on 1999-05-04 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume consists of twenty chapters addressing different aspects of the theme of fluvial processes and environmental change. The overall coverage is broad; scientifically, (from modelling to alluvial dating), geographically (from arid zone flash-flooding to glacial meltwaters) and in time (from contemporary process studies to the Quaternary). The introductory chapter sets the context, which is an attempt to show how studies of fluvial processes can help us in understanding and therefore predicting the impact of environmental change on our rivers, riverine resources and landscapes. Environmental change includes both climatic factors, however caused, and human impacts on river basins. The differentiation of these two factors is discussed in several chapters whilst others take a more holistic approach. Both climatic and human factors have, and will remain, to act together and so their interactions need to be understood. Fluvial Processes and Environmental Change is divided into five sections, commencing with the slope-catchment scale and proceeding to studies of channel response, then floodplain processes and floodplain response and finally two studies from glacierised basins. The volume originated as a two-day session of the British Geomorphological Research Group and contributors from Europe, the USA and Australia were included in order to provide a wide perspective on the topic. This book will be a valuable reference for postgraduates and researchers in fluvial geomorphology, hydrology, Quaternary science, geology and environmental science.
Download or read book The Little Ice Age written by Jean M. Grove and published by Routledge. This book was released on 2019-04-30 with total page 869 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evidence for the Little Ice Age, the most important fluctuation in global climate in historical times, is most dramatically represented by the advance of mountain glaciers in the sixteenth and seventeenth centuries and their retreat since about 1850. The effects on the landscape and the daily life of people have been particularly apparent in Norway and the Alps. This major book places an extensive body of material relating to Europe, in the form of documentary evidence of the history of the glaciers, their portrayal in paintings and maps, and measurements made by scientists and others, within a global perspective. It shows that the glacial history of mountain regions all over the world displays a similar pattern of climatic events. Furthermore, fluctuations on a comparable scale have occurred at intervals of a millennium or two throughout the last ten thousand years since the ice caps of North America and northwest Europe melted away. This is the first scholarly work devoted to the Little Ice Age, by an author whose research experience of the subject has been extensive. This book includes large numbers of maps, diagrams and photographs, many not published elsewhere, and very full bibliographies. It is a definitive work on the subject, and an excellent focus for the work of economic and social historians as well as glaciologists, climatologists, geographers, and specialists in mountain environment.
Download or read book Hydrogeology and Water Quality of the Walnut Creek Watershed written by William W. Simpkins and published by . This book was released on 1996 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
